MgAl2O4 Spinel 성형체의 제조방법
The present invention refers to transparent bulletproof window, transparent IR searcher protection for closed circuit television, high energy RF device is connected to the transparent window moldings thereof in number during a writing method relates to number MgAl2O 4 Spinel ceramic bath tank, vitreous materials for use with nano-size MgAl2O 4 Spinel is provided allowing the gel casting, such as high pressure liquid coolant filter press molded articles can be electrically connected to uniform number method are disclosed. In MgAl2O 4 Spinel raw material powder with water hydration reaction solvent distributed by aggregation of powder material occurs, thereby number bath the necessary uniform transparent ceramic shaped bodies and sintered body number difficult to oxide or transparent MgAl2O 4 ceramic solution is exactly known. The present invention refers to MgAl2O 4 Spinel wet press forming by overcoming technical, transparent ceramic number necessarily uniform MgAl2O 4 Spinel shaped bodies to a number of the bath bath method are disclosed. (Technique of the existing method) 0 transparent MgAl2O 4 Spinel ceramic of the existing method. 5 - 5 micro m of microns and raw materials, sintered sintered at a temperature of 1,650 °C with promotion added LiF (US2006021726A 1) response from the smaller number by sintering. The method MgAl2O 4 Spinel ceramic are same number is small, the addition of LiF is boundaries to a number to be used in sintering promoting strength, mechanical properties including hardness lowers so that the door number, durable in extreme environments than requiring transparent bulletproof window, such as used in the application of transparent IR-tank as a limit number article for protecting search for closed circuit television. Recent is formed of vitreous material by using a nano is much better properties, such as excellent mechanical properties without adding a sintering promoting number LiF transparent MgAl2O 4 Spinel ceramic techniques etc. introduced number be small. What final number order number transparent MgAl2O 4 ceramic high pressure liquid coolant than is required which comprehensively perfect pores inside main article number, order particle aggregates caused by same large pore-free uniform over a number small shaped bodies most important disclosed. Nano powder molded articles using uniform powder dispersion medium for small order number are in disperse well must be monodispersed state, its uniform monodispersed state is retained even should is formed. The surfaces of the raw material powder dispersion process generally to nanopowder MgAl2O 4 specially needed a very strong dispersion process, raw materials react with water (hydration reaction) to a PTFE particle dispersion during dispersion it joins in, MgAl2O 4 form a uniform pore distribution according to the inner-like shaped aggregates the PC disclosed. In order to ensure uniformity of the shaped bodies due to such door number is the most desired wet molding a molded bodies that are known to very is exactly the number etc. informing MgAl2O 4 high pressure liquid coolant. Thus most used in dry forming small number through transparent ceramic MgAl2O 4 changes, using special dispersion device→through granular powder dispersed nano-size process for spray drying (dry-forming) (HIP) number bath→dry pressing→1 difference leads to having low order of hot gravitational pressure sinter standby sintered→2 difference is generally a small number are disclosed. Using nano powder molding method such as the next number MgAl2O 4 small number which are not uniform, the electrolytic cell used in dry forming wet molding is formed between the described substrate. First, dry molding techniques may provide the following those 2000. According to solve MgAl2O 4 nano powder onto and precipitated door number for use instead of hydration of isopropanol or ethylene glycol (Journal of European Ceramic Society, Vol. 32, pp. 2869 - 2886, 2012) of an organic solvent such as applying method is not charged to high solids content polymer layer and the number, the internal non-uniformities during spray drying method is molded in a hypersensitive response provider or hard cake (hard cake), spray drying process more strictly in number through small number even if their spray dry [e[e] hard cake is behind-gate mold powder granules forming the pressure exerted on the granular powder is placed in a wide pore distribution is non-uniform due to its inner delivery leave door dVf-sequence number. This hard cake and wide pore distribution is then sintering process becomes a large pores act causes the material is to be coated. These recent uniaxial press molding a molded article 1 to overcome disadvantages of dry process for difference of very high pressure (generally by applying pressure 200 mpa hereinafter) 350 provided 700 mpa gravitational pressure by twin-molded inner resonance are minimizing method (Journal of american ceramic society (1), Vol. 93, No. 9, pp2656 provided 2666, 2010, (2) USP6, 066584) not also number without intending to be limited, the rotation of the device relative to the pressure gradient and cold gravitational pressure molding device by taking into account the future mass number diameter wet hundreds big disadvantage disclosed. Second, the pin is wet molding techniques may provide the following ones. MgAl2O 4 molding techniques for ensuring uniformity of the wet-formed is described be attempted preparation legal entity. In order to number of aggregation of powder particles by hydration MgAl2O 4 billion, seven Al H3PO 4 alcohol 3 (H2PO 4) of water on the surface with reformed MgAl2O 4 raw material slip casting method (Bulletine of Material Science, Vol. 34, No. 2, pp. 327 - 335, 2011) is one are disclosed. The method herbicidal unit size of microns (0. 5 - 1. 0 micro m) of MgAl2O 4 powder is used, a coherent and strong nano powder example is free. Further, in surface-modified material such as expensive seven alcohol solvent to form an excess is required, an additional process device and processes the mirror number added parts by weight of low disclosed. Using nano powder slip casting method (Journal of american ceramic society, Vol. 94, No. 5, pp. 1388 - 1396, 2011) and to perish which also number, such as a polymer dispersion number NH4PAA (Ammonium Poly Acrylic Acid) dispersed with nano material disperse well characterized by ball mill facility solution is obtained, the solutions are poured in mold gypsum slip casting method are disclosed. The method number NH4PAA slurry used in dispersion by adding small number, passing the oversized NH4PAA coagulation time of such molecules to each other having tertiary, oversized gypsum mold they are standing idle for a long time be preparation include uniform number molded articles less difficult and disclosed. Slip casting method is a small shaped bodies in the papers transparently number etc. not in number. In addition, preparation is formed on the moulded bodies from becoming contaminated after heat treatment material into a gypsum frame is more oxidized easy processing yield or reproducibility of strontium carbonate are disclosed. Another wet-formed gel casting method the ends of the first legal entity, the ceramic particles by polymerization of monomer mix solution method 1 hours by any method, a dispersion-based in ceramic particles over time due to the number produced by the coalescer minimize door, very high molding is an extremely uniform strength for the green processing such as insulated from the first local damage during handling hereinafter without the door number in one aspect very mirror number method are disclosed. The gel casting method applied to a small and practical examples of recent papers disclosed MgAl2O 4 molded body number (Journal of american ceramic society, Vol. 93, No. 9, pp. 2656 - 2666, 2010) etc. not in number. In the thesis 0 average particle diameter. 1 submicron powder MgAl2O 4 micro m or more deflection, the nano-powder gel casting an example is a power number not disclosed. The number of content of 30 wt % hereinafter work percentage gel casting method wherein slurry is typically when slurry carbon, contained in a molding density exceeds a lower drying and sintering shrinkage number arithmetic generates thereby bending the outer surface of the product occurs. Nano powder specific surface cursor phase when dispersed in excess of 50 - 60 wt % water gel casting molding method such as applying required upon, the aforementioned number from warpage or distortion of the filters and the occur in the presence of a strontium carbonate, not the number of gel casting operation MgAl2O 4 nano powder cladding not a state of exhaustion. In addition, the wet process method reports the number ceramic parts small filter press molded product is not as regards a small number also not MgAl2O 4 number techniques, this preparation such as particles and apparatus precipitated door according to time so that number to determine the other. The, in the present invention a multiplicity of existing processing techniques while overcoming mirror number plus applying wet process using the transparent MgAl2O 4 ceramic manufacturing method used to number a number tank necessarily uniform molding pin is under public affairs. In addition to distributed number MgAl2O 4 nano powder dispersion further organic particles and apparatus sinkage MgAl2O 4 particles according to hydration of dialkyl carbonates and monomer by adding almost free from making stable slurry, the solutions are legal entity of the present invention unique molding Filter pressing + gel castingComposite technique of barley, non-uniform distribution of pores to locally essential transparent MgAl2O 4 ceramic shaped bodies under public affairs number which the pin is not very uniform. In the present invention is returned to adding monomer that is geometrically particles which interfere with the surface nanoparticles serve, together with the slurry stability imparting dispersion number on electrostatic MgAl2O 4 returning he desires. The present invention refers to such interacts with a slurry with respect to Filter pressing + gel casting Molding of the bath using transparent ceramic number necessarily uniform MgAl2O 4 under public affairs number because of the shaped bodies are disclosed. (Structure and operation of the invention) Hereinafter, the present invention it relates on the other. The present invention refers to the inner consists of the following steps. 1) to distilled water obtained by melting a number on a Gelcasting Acrylamide Methylenebisacrylamide 5 provided 20 wt % monomer solution in the bath. 2) monomer solution number 57 nm average particle diameter 30 m2/g specific surface area and high pressure liquid coolant, purity 99. At least 99% purity MgAl2O 4 nano powder slurry (monomer solution + MgAl2O 4 powder) to the total amount of the 50-a 60 wt % which can be, to a dispersed Citric acid number 0. 3 - 2. 0 wt % slurry mixing step number small sufficiently well. A very small nano powder to near the monomer molecular nano powders adsorbs to a geometrically aggregation between which interfere with applied, aggregation and sinkage MgAl2O 4 particles without using a very stable slurry used to obtain efficient. As well as the monomer effective dispersion, the filler and optionally process steps of gelling (polymerized) imparts the greatest possible strength also serves to be coated. 3) the disclosure number Ammonium persulfate solution slurry in said slurry to gelling to modify gelatination reaction monomer unit weight (1g) by adding and mixing for 1 micro l per 4) MgAl2O 4 of said slurry pore size is 0. 2 micro m hereinafter line filter mounting slurry was filtered aqueous solutions contains pressurised and injected into the mold after, molded body are separated from each other in a mold heated to 60 °C oven step time gelling (Gelation) into 1. Of the present invention FilterPressing + gel casting Composite technology in a number of input filter pressing process and molding method by etching stop 50 provided 70 wt % phase when dispersed in a stand-alone to gelling, 40% or more uniform number work percentage molded articles by pressing molding density filter and nano powder of high specific surface area due to the advantages of a decoding impossible gel casting technique and can be molded articles can be formed to receive an green machining is number of high pressure liquid coolant due to the uniformity of the high pressure liquid coolant for ceramic moldings thereof can be transparent MgAl2O 4 hereinafter number are disclosed. Filter pressing gelatination moulded bodies need not necessarily be separated from and not necessarily mold, mold itself in situ gelling even if heating are disclosed. 5) the molded product number work grudge standby atmosphere, at a temperature of 1,550 °C-a 1,600 °C and burning the 1, 2 so as to produce a pore-free hot gravitational pressure sinter °C 1,380 provided 1,550 °C difference in step (HIP) transparent MgAl2O 4 ceramic small number. Hereinafter, the reason for this numerical defining are disclosed therein. A monomer solution for dispersion of nano powder is below 5 wt % cross gel casting MgAl2O 4 cannot fully exert the effects, gelatination molded objects obtained through the element through a green processing at an intensity sufficient to impart a polymer amount cannot. Even when the amount exceeds 20 wt % addition of monomer dispersion of nano powder called significantly enhanced green strength and molded body effect since the cross number and diameter plus 5 provided 20 wt % monomer in solution preferably for restricting. Monomer solution MgAl2O 4 mounted on the average particle size of nano powder is 0. 1 cover the micro m, compared to 100 provided 150 °C up alarmingly is nano powder sintering temperature since, after sintering of particles 5 micro m MgAl2O 4 sintered body obtained is also increases and more intensity dependent particle size of a plurality of groups, and the resonance of the inner hardness, material mechanical properties in diameter number aspects having an average particle diameter 0. 1 nano material preferably less than micro m use. Mounted on the monomer solution 50 provided 60 wt % bigger range of quantity of nano powder, less than 50 wt % if desired volume of shaped bodies used in filter pressing time smaller number be able mirror number and parts by weight of low, top cover surface forming body 60 wt % less number where the viscosity of the slurry is raised to excessively, insufficient fluidity that the agent into the mold-sided sheath, thereby making it possible to leave a residual air bubble after sintering the slurry containing a large deficiency are disclosed. When mounted on the small amount of added Citric Acid number 0 to number dispersed slurry. 3 - 2. 0 wt % Cu2Se. Its is represented 0. If the scattered particles for which there is a lack the variance of less than 3 wt % number suffers and, in 2. 0 wt % the viscosity of slurry as the number sinkage cover occurs. Filter pressing the steel mold use, of metal material such as aluminum have diameters less than 2000. Slurry drain for use in delivering the filter pore size is applying pressure to 0. 2 micro m hereinafter in membrane filter or alumina, silica such as a ceramic filter formed of the bigger, pore size is 0. 2 micro m filter the plurality of nano powder are discharged with the excess monomer solution so that his fellow workers. After this subsequent gel casting process temperature and time are generally known conditions not specifically with respect to not use numerical defining therein. Molded body in the air are heated to a temperature of 1,550 °C-a 1,600 °C difference by sintering is equal to 1. Sintering temperature is below 95% hereinafter the theoretical density of the sintered density is 1,550 °C-to obtain a pore-free ceramic hot gravitational pressure sinter (HIP) 2 difference in transparent MgAl2O 4 is difficult, 1,600 °C 3.5D but 95% or more exceeds the density is formed of sintered particles increases as the magnitude of strength and configuration, lowering the sintering temperature difference in mechanical properties including hardness in the range of 1 so the number preferably relayed °C 1,550 provided 1,600 °C. Such a difference in 2 1 difference sintered body are °C 1,380 provided 1,550 °C, preferably 1,450 °C-a 1500 °C (HIP) sintering in good hot gravitational pressure transparent MgAl2O 4 ceramic small number subjected to substrate. According to the present invention as described above, consisting in adding dispersed aqueous monomer solution on Acrylamide Methylenebisacrylamide Citric Acid number average particle diameter d50 In MgAl2O 4 Spinel=57nm distributed nano raw material slurry Filter press + gel casting Method and a central transparent molded product obtained from the small number of the bath MgAl2O 4 Spinel ceramic number necessarily uniform enabling equal to or less than. The filter press of the invention gel casting method [1 also] + molded product obtained from transparent MgAl2O 4 ceramic photo are disclosed. Hereinafter, the present invention through a in the embodiment detailed as follows. (In the embodiment) A monomer at a rate of 10 wt % to 90 ml distilled water is a solution having an average particle diameter d 24:1 Methylenebisacrylamide Acrylamide and melting50 =57nm, specific surface area 30 m2/g, purity 99. In 99% Citric Acid number 1 in a distributed 100g MgAl2O 4 raw material. 0g YTZ balls which can be well dispersed slurry mixing medium layer is formed serve as small number MgAl2O 4 2 time-gate. At this time, the slurry pH was adjusted to the range of 8 - 10. The number work grudge Ammonium persulfate solution per 1 micro l 1g slurry in slurry gelling disclosure number after the amount of addition and mixing, vacuum defoaming by number bubbles within the slurry was a stand-alone. The slurry pore size 0. 2 micro m membrane filter is mounted in a small number it does, pressurised mold injected into a shaped body, the relative density of a molded article after filter pressing was 40%. Such a way that microwaves 60 °C 1 molded into the heating performed in monomer to gelling into very dry. Air atmosphere, sintering 1,570 °C 2 in his time. 1 difference relative density of 98% or more sintered sintered body are min. 1 difference number 1,500 °C for internal pores of the sintered body are stand-alone, 180 mpa, hot constant pressure sinter time was about 3. Of sintered body density of hot constant pressure sinter 99. A pulse 9% or more, such as transparent state [1 also] has been confirmed. (Comparison example) An average particle diameter d 90 ml distilled water50 =57nm, specific surface area 30 m2/g, purity 99. In 99% 100g MgAl2O 4 nano material, dispersed in a number NH4PAA 5. 0g YTZ balls into a mixing medium is well dispersed slurry MgAl2O 4 small number-gate ring serve as 2 hours. The number work grudge slurry after vacuum defoaming, slip was poured in mold gypsum casting. Casting molded atmosphere the elder brother grudge which burns completed gypsum from the mold, a transparent conductive layer 3 at room temperature during drying, moldings thereof relative density was 38 - 40%. Such a way that their atmosphere, sintering 1,570 °C 2 in his time. 1 difference relative density of 98% or more sintered sintered body are min. 1 difference number 1,500 °C for internal pores of the sintered body are stand-alone, 180 mpa, 3 time about his hot gravitational pressure sinter (HIP). Of sintered body density of hot gravitational pressure sinter 99. 9% or more pulse, translucent state has been confirmed. The present invention refers to MgAl2O 4 nano powder dispersion step in addition to the monomer dispersion number by adding a laser current further hydration of stable almost free from aggregation and sinkage MgAl2O 4 particles according to particles for making slurry, the solutions are legal entity of the present invention unique molding Filter pressing + gel castingComposite technique of barley, essential transparent MgAl2O 4 ceramic molded articles without non-uniform distribution of pores to locally very uniform under public affairs number circuit board substrate. In the present invention is returned to adding monomer that is geometrically particles which interfere with the surface nanoparticles serve, together with the slurry stability imparting dispersion number on electrostatic MgAl2O 4 returning he desires. This interacts with a slurry with respect to Filter pressing + gel casting The combination of molding molded transparent ceramic number requisite very uniform MgAl2O 4 bath nephrophathy less number. A step number 5 provided 20 wt % distilled water on the Acrylamide Methylenebisacrylamide melting monomer solution bath, high pressure liquid coolant monomer solution number 57 nm in average particle diameter to the total amount of the slurry which can be 50-a 60 wt % MgAl2O 4 nano powder, dispersion into a Citric acid number 0. 3 - 2. 0 wt % slurry by mixing small number step, said slurry to gelling to modify the disclosure number 1 per unit weight in Ammonium persulfate solution slurry to monomer gelatination reaction 1g adding micro l mixing, slurry pore size is 0. 2 micro m hereinafter line filter mounting slurry was filtered aqueous solutions contains pressurised and injected into the mold after, molded in a mold separation step (Gelation) into and out of the oven 1 is heated gelling time, number molded work grudge atmosphere atmosphere, at a temperature of 1,550 °C-a 1,600 °C and burning the 1, 2 °C 1,380 provided 1,550 °C difference in step number so as to hot gravitational pressure sinter (HIP) the result [e[e] the uniformity which falls MgAl2O 4 Spinel MgAl2O 4 small ceramic molding manufacturing method Back number Back number
