Production method of high-temperature high-power piezoelectric ceramic

The invention discloses a production method of high-temperature high-power piezoelectric ceramic by a MnO2-modified lead iridium niobate-lead zirconate-lead titanate (PYN-PZ-PT) ternary system. The production method comprises the following steps of: preparing raw materials, namely analytically pure PbO, Yb2O3, Nb2O5, ZrO2 and MnO2 and chemically pure TiO2; synthesizing clinkers by a two-step method, namely mixing Yb2O3 and Nb2O5 according to a stoichiometric ratio and performing ball milling respectively; presintering at 1,100 DEG C for 4 hours to synthesize a precursor; mixing the precursor with PbO, ZrO2, TiO2 and MnO2, and keeping the temperature at 850 DEG C for 3 hours to synthesize PYN-PZ-PT powder; performing dry pressing molding at 150MPa, sintering at 1,220 DEG C, and keeping the temperature for 3 hours; grinding and polishing a sintered sample to form a wafer with the diameter of 10 to 11mm and the thickness of 0.5mm, coating silver, and energizing at 3 to 4KV/mm in silicon oil ...

Production method of nano silicon nitride powders

The invention relates to a production method of nano silicon nitride powders, which solves the problems of low production efficiency, expensive material and low product yield of the conventional method. The production method comprises the following steps of: (1) adding solid silicon nitride, silane and liquid ammonia into a mixer, gasifying in the mixer, and then heating the gasified gas mixture to 1200-1400 DEG.C in the honeycombed graphite of an intermediate-frequency coil to generate the gas mixture of the silicon nitride powder and the ammonium chloride gas; (2) collecting the solid silicon nitride powder and the ammonium chloride mixed powder at the bottom part when the gas mixture passes through a cooler and a bag collecting device with an inner temperature of 100-250 DEG.C, and enabling the gases which go out of the upper part of the device and carry the residual ammonium chloride and silicon tetrachloride to enter the cooler for circular treatment; (3) keeping the collected solid ...

Method for preparing Sialon ceramic powder from aluminum ash and fly ash

The invention relates to a method for synthesizing Sialon ceramic powder by using aluminum dross and fly ash, which belongs to the technical field of ceramic material. The method takes the aluminum dross and the fly ash as main raw materials, and takes carbon black as a reducing agent, and the Sialon ceramic powder is prepared by the aluminothermic and carbothermic compound reduction nitridation process, which realizes the reuse of the aluminum dross and the fly ash as well as environmental protection. The method has the advantages of simple process and wide applicability. By making the waste aluminum dross and the fly ash which are difficult in treatment into the Sialon ceramic powder, the cost of producing the Sialon powder is reduced, and the wastes which are easy to result in environmental pollution are utilized.

Method for producing using aluminum gray and coal gangue composite castoff

The invention discloses a production method of Aluminum-Silicon alloy in the field of metallurgy technology by utilizing a composite waste including aluminum ash and coal gangue, which has the procedures as follows: the first step is the material preparation and the pretreatment of raw material, i.e. iron removal by magnetic separation pretreatment for aluminum ash, optimal selection and milling to the granularity of smaller than 40 meshes and iron removal by magnetic separation pretreatment on coal gangue; the second step is proportioning and briquetting, i.e. proportioning according to the following weight percent including 5 to 25 percent of aluminum ash, 60 to 95 percent of coal gangue and 0 to 15 percent of petroleum coke, adding 15 to 20 percent by the weight of raw material of waste pulp with as binder, mixing the material to briquette and baking to moisture of below 2 percent; the third step is preparation of Aluminum-Silicon alloy by using electrothermal method. The invention overcomes ...

Silicon oxide material with rod-like structure as well as synthesis method and application of silicon oxide material

The invention discloses a silicon oxide material with a rodlike structure as well as a synthesis method and application thereof. The synthesis method comprises the following steps: step 1, preparing silicic acid; 2, preparing a seed crystal; 2, pure water, alcohol and organic weak base are added into the silicic acid prepared in the step 1, the alcohol serves as a polymerization inhibitor, the organic weak base serves as a pH value regulator, under the combined action of the silicic acid, the alcohol polymerization inhibitor and the organic weak base, the normal polycondensation nucleation process of the silicic acid is interfered, and the prepared seed crystal is in a chain shape; and step 3, preparing a base solution from the chained seed crystal, further synthesizing and growing particles with rod-like structures by adopting a constant liquid level evaporation method, further growing the particles to obtain the silicon oxide material with the rod-like structures, so that the polishing ...

On-line cleaning device and on-line cleaning method for ion exchange column

The invention discloses an on-line cleaning device and an on-line cleaning method for an ion exchange column, and belongs to the technical field of application of ion exchange columns. The online cleaning device comprises an ion exchange column, a negative pressure material lifting tank, a vacuum negative pressure pump and air compression equipment, a material lifting pipe penetrating through the inner side and the outer side of the ion exchange column is arranged on the upper portion of the ion exchange column, the outer side end of the material lifting pipe is communicated with the lower portion of the negative pressure material lifting tank through a guide pipe, and the upper portion of the negative pressure material lifting tank is communicated with the vacuum negative pressure pump and the air compression equipment. The negative-pressure lifting tank is used for alternately forming negative pressure and positive pressure in the negative-pressure lifting tank, so that resin in the ion ...

Method for producing aluminum-silicon alloy

The invention discloses a method for producing aluminum-silicon alloy, which is a method for producing the aluminum-silicon alloy with over 50 weight percent of aluminum by using coal-series kaolin and corundum dust removal ash as raw materials and adopting an electric heating process. Because the current raw materials for producing the aluminum-silicon alloy mainly comprise kaolin, bauxite and commercial alumina, the bauxite resource in China is increasingly scarce due to great consumption and faces exhausted situation, and the cost is high. The coal-series kaolin serving as the main raw material is matched with the corundum dust removal ash so as to reduce the cost of the aluminum-silicon alloy, consume the wastes easily causing environmental pollution and gain obvious economic and social benefits.

Method for synthesizing alpha-Sialon ceramic material by using aluminum ash and blast furnace slag

The invention relates to a method for synthesizing Alfa-Sialon ceramic material utilizing the aluminium ash and blast furnace slag in the technical field of ceramic material. With aluminium ash and blast furnace slag as raw materials, the invention synthesizes Sialon ceramic material through the aluminum-thermal and silicon-thermal reduction and nitridation method by utilizing the metal aluminum in aluminum ash and addition the metal silicon as the reducing agent. With simple technique and wide application range, the method for synthesizing Alfa-Sialon ceramic material not only lowers the cost for producing the Sialon ceramic materials, but also utilizes the wastes easily causing the environmental contamination by preparing two hardly treated wastes such as the waste aluminum ash and blast furnace slag into the Sialon ceramic material having a wide application range.

Method for producing aluminum silicon alloy using aluminum gray and coal gangue composite castoff

Method for producing calcium aluminate with waste aluminum gray

Yttrium zirconium composite nano-ceramic powder

The invention relates to an yttrium zirconium composite nano-ceramic powder in the field of ultrafine ceramic and preparation method thereof. The components and molar percentage contents of the composite nano-ceramic powder are as follows: 5% to 8% of yttrium oxide and 92% to 95% of zirconium oxide; the preparation method includes the following steps: zirconium oxychloride is dissolved in ethanol, and then yttrium oxide is added at the temperature of 60 DEG C to 80 DEG C; cooling, sodium bicarbonate or potassium bicarbonate solution is added, acrylic ester is then added, ultrasonic washing is carried out for 20 to 30 minutes, and reaction is carried out after putting in a high pressure reaction pot; the power is taken out after the reaction is finished, and then washed, so that the yttrium zirconium composite nano-ceramic powder is obtained. The invention has simple preparation method and low cost, and industrialization production is easily realized; the yttrium zirconium composite nano-ceramic ...

Method for preparing calcium-hexaluminate ceramic powder by calcium slag

The invention relates to a method for preparing calcium hexaluminate ceramic powder from calcium slag in the technical field of ceramic materials, which comprises: firstly, adopting the calcium slag and industrial alumina as raw materials, and preparing the calcium hexaluminate ceramic powder by a reaction sintering method, wherein the weight percentage of the calcium slag and the industrial alumina is respectively 10 to20 percent and 80 to 90 percent, and the sum of the weight percentage of the calcium slag and the industrial alumina is 100 percent; secondly, performing uniform mixing and forming, and placing formed blanks into a high-temperature furnace for sintering; and thirdly, naturally cooling the formed blanks to the room temperature, crushing the formed blanks, and obtaining the calcium hexaluminate ceramic powder. The method has simple and convenient technology, has low requirements on the calcium slag raw material, does not need to treat the calcium slag, can prepare the calcium ...

Chute device with electromagnetic purifier

Production method of nano silicon nitride powders

The invention relates to a production method of nano silicon nitride powders, which solves the problems of low production efficiency, expensive material and low product yield of the conventional method. The production method comprises the following steps of: (1) adding solid silicon tetrachloride, silane and liquid ammonia into a mixer, gasifying in the mixer, and then heating the gasified gas mixture to 1200-1400 DEG.C in the honeycombed graphite of an intermediate-frequency coil to generate the gas mixture of the silicon nitride powder and the ammonium chloride gas; (2) collecting the solid silicon nitride powder and the ammonium chloride mixed powder at the bottom part when the gas mixture passes through a cooler and a bag collecting device with an inner temperature of 100-250 DEG.C, and enabling the gases which go out of the upper part of the device and carry the residual ammonium chloride and silicon tetrachloride to enter the cooler for circular treatment; (3) keeping the collected ...

Method for preparing calcium-hexaluminate ceramic powder by calcium slag

The invention relates to a method for preparing calcium hexaluminate ceramic powder from calcium slag in the technical field of ceramic materials, which comprises: firstly, adopting the calcium slag and industrial alumina as raw materials, and preparing the calcium hexaluminate ceramic powder by a reaction sintering method, wherein the weight percentage of the calcium slag and the industrial alumina is respectively 10 to20 percent and 80 to 90 percent, and the sum of the weight percentage of the calcium slag and the industrial alumina is 100 percent; secondly, performing uniform mixing and forming, and placing formed blanks into a high-temperature furnace for sintering; and thirdly, naturally cooling the formed blanks to the room temperature, crushing the formed blanks, and obtaining the calcium hexaluminate ceramic powder. The method has simple and convenient technology, has low requirements on the calcium slag raw material, does not need to treat the calcium slag, can prepare the calcium ...

Method for producing aluminum-silicon alloy

The invention discloses a method for producing aluminum-silicon alloy, which is a method for producing the aluminum-silicon alloy with over 50 weight percent of aluminum by using coal-series kaolin and corundum dust removal ash as raw materials and adopting an electric heating process. Because the current raw materials for producing the aluminum-silicon alloy mainly comprise kaolin, bauxite and commercial alumina, the bauxite resource in China is increasingly scarce due to great consumption and faces exhausted situation, and the cost is high. The coal-series kaolin serving as the main raw material is matched with the corundum dust removal ash so as to reduce the cost of the aluminum-silicon alloy, consume the wastes easily causing environmental pollution and gain obvious economic and social benefits.

Method for producing high-purity fused mullite

The invention discloses a method for producing high-purity fused mullite by taking corundum dedusting ash as a major raw material and silica as an auxiliary raw material. In the method, mullite is produced by adopting a fused process, and a complete liquid phase reaction is undergone in the fused process, so that product quality is enhanced and the content of mullite is over 97 percent. Moreover, the corundum dedusting ash serving as a raw material used in the production is industrial solid waste, so that production cost is lowered, the environment is protected and pollution is reduced. Therefore, the method has a good application prospect.

Method for synthesizing alpha-Sialon ceramic material by using aluminum ash and blast furnace slag

The invention relates to a method for synthesizing Alfa-Sialon ceramic material utilizing the aluminium ash and blast furnace slag in the technical field of ceramic material. With aluminium ash and blast furnace slag as raw materials, the invention synthesizes Sialon ceramic material through the aluminum-thermal and silicon-thermal reduction and nitridation method by utilizing the metal aluminum in aluminum ash and addition the metal silicon as the reducing agent. With simple technique and wide application range, the method for synthesizing Alfa-Sialon ceramic material not only lowers the cost for producing the Sialon ceramic materials, but also utilizes the wastes easily causing the environmental contamination by preparing two hardly treated wastes such as the waste aluminum ash and blast furnace slag into the Sialon ceramic material having a wide application range.

Method for producing calcium hexaluminate with waste aluminum ash

The invention relates to a method for producing calcium aluminate by waste aluminium dross. In the method, according to weight proportion the waste aluminium dross accounting for 80-97% and calcium oxide accounting for 3-20% are taken as raw materials (the total proportion thereof is 100%), uniformly mixed with a reducing agent accounting for 5-5% of the total weight of the raw materials and a precipitating agent accounting for 10-15% of the total weight of the raw materials and smelted in an electric arc furnace to obtain calcium hexaluminate, and the smelted calcium hexaluminate is poured out, cooled, crushed and separated. The method has simple and convenient process and can replace bauxite to produce high-purity calcium aluminate without treating the waste aluminium dross, thus the production cost of the calcium aluminate is reduced, and the waste aluminium dross which easily causes environmental pollution is utilized.