Reagent for restraining nucleation in synthesizing diamond

Method for manufacturing man-made polycrystalline diamond nozzle

The invention discloses a method for manufacturing a man-made polycrystalline diamond nozzle. The method comprises the following steps of: evenly coating a hexagonal boron nitride film on a metal wire with a preset size, and making the coating film thickness be 1 mm; putting the coated metal wire in the center of a mixture of a diamond and metal Co micro powder, and then putting the metal wire and the mixture into a mould with the nozzle core size of a gem nozzle together; synthesizing a man-made polycrystalline diamond at a temperature of between 1,350 and 1,550 DEG C and under a pressure of between 5.5 and 6.5 GPa; and drawing out the metal wire, and carrying out processing, burnishing, deburring, finishing and grinding by a conventional method to obtain the man-made polycrystalline diamond nozzle with the diameter between 0.10 and 1 mm. The method has the advantages of simple processing process and long service life of the man-made polycrystalline diamond nozzle, and can realize diversification ...

Method for manufacturing artificial diamond polycrystalline grinding wheel dressing pen head

The invention provides a method for manufacturing an artificial diamond polycrystalline grinding wheel dressing pen head, which comprises the following steps: drilling a hole on a hexagonal boron nitride solid block in advance; putting a mixture of diamond and metal Co micro powder in the hole, and putting the hole and the mixture into a high-temperature and high-pressure resistant die to synthesize artificial diamond polycrystalline (PCD) so as to achieve the preforming of the dressing pen head; and processing round or tapered holes and other holes on the hexagonal boron nitride solid block to achieve the shape diversification of the dressing pen head, and simultaneously controlling the size of the holes to determine the size of a pen head processing surface. The method can greatly improve the service life and can satisfy the requirement of industrial production; besides, the price is obviously lower than that of the prior dressing pen head made from materials of natural diamond and the ...

Diamond-filled isotropical high-performance heat-conductive adhesive and preparation method thereof

The invention belongs to the technical field of material preparation, in particular relates to a diamond-filled isotropical high-performance heat-conductive adhesive and a preparation method thereof. The preparation method comprises the following steps of: firstly, mixing epoxy resins with an epoxy toughness modifier by mechanical stirring for 20 minutes at the rate of 1,500 r/min; secondly, adding a heat-conductive diamond filler into the obtained product under the stirring state, adding a modifier and a diluent on the filler surface, and continuously stirring for 15 minutes after the addition process is over; thirdly, adding a curing agent and a curing accelerator into the mixture after uniform mixing, performing mechanical stirring for 5 minutes, and transferring the mixture into a high-speed shear mixing machine for mixing for 30 seconds at the rate of 2,000 r/min; and fourthly, obtaining uniformly mixed jelly, namely the heat-conductive adhesive, after performing repeated mixing for ...

Conductive printing ink composite for printing of wireless radio frequency identification devices (RFID)

The invention relates to a conductive printing ink composite for printing of wireless radio frequency identification devices (RFID), which comprises the following components in percentage by weight: 2%-10% of at least one type of epoxy resin, 5%-10% of epoxy resin toughness modifier, 30%-50% of reactive diluent, 2%-4% of curing agent, 1%-1.5% of curing accelerator, 30%-50% of conductive filler, 10%-30% of organic solvent, and 0-1.5% of flowing additive, adhesion promoter, rheological control agent and filler surface modifier. The conductive printing ink for the printing of the RFID has the advantages of high conductivity, high adhesion strength, stable electrical property and the like, and has good printing property on high-energy surfaces of metal, ceramics, glass and polymers.

Method for manufacturing artificial diamond polycrystalline grinding wheel dressing pen head

The invention provides a method for manufacturing an artificial diamond polycrystalline grinding wheel dressing pen head, which comprises the following steps: drilling a hole on a hexagonal boron nitride solid block in advance; putting a mixture of diamond and metal Co micro powder in the hole, and putting the hole and the mixture into a high-temperature and high-pressure resistant die to synthesize artificial diamond polycrystalline (PCD) so as to achieve the preforming of the dressing pen head; and processing round or tapered holes and other holes on the hexagonal boron nitride solid block to achieve the shape diversification of the dressing pen head, and simultaneously controlling the size of the holes to determine the size of a pen head processing surface. The method can greatly improve the service life and can satisfy the requirement of industrial production; besides, the price is obviously lower than that of the prior dressing pen head made from materials of natural diamond and the ...

Thermal treatment method for aluminum alloy

The invention relates to a thermal treatment method which can improve the inter-crystalline corrosion resistance of 6000 series Al-Mg-Si-(Cu) aluminum alloy and does not reduce the tensile property ofthe alloy at the same time, and belongs to the technical field of thermal treatment of aluminum alloy. The method comprises the following steps: firstly, carrying out solid solution treatment for the6000 series aluminum alloy at the temperature range of between 520 and 580 DEG C, preserving the heat for 15 to 240 minutes, quenching the aluminum alloy, and then carrying out primary ageing for 15to 480 minutes at the temperature of between 180 and 240 DEG C; and carrying out secondary ageing for 24 to 2,400 hours at the temperature of between 130 and 170 DEG C, and finally ageing the aluminumalloy for 2 to 10 hours at the temperature of between 180 and 240 DEG C. Compared with the ageing of the conventional T6 peak value, the tensile property of the 6000 series aluminum alloy treated bythe method ...

Diamond ultrathin saw bit with nickel aluminium alloy as base and manufacturing method thereof

The invention relates to a ni-al alloy-based diamond ultra-thin saw blade used for precise cutting in single (multi) crystal silicon, glass, ceramic, gem processing, etc. industries and the preparation method of the diamond ultra-thin saw blade. 50-70 units (volume percentage) of the nickel (5-20 micro meters) with the purity more than 99.9%, 10-30 units of aluminium powder (5-20 micro meters) and 20-30 units of titanium-plated artificial diamond grains (5-10 micro meters) are uniformly mixed in a three dimensional material mixer, then arranged into a die and cold pressed to a biscuit with the diameter dimension of Phi 25-200mm multiplied by 100-400 Mum on a four-column hydraulic press under a forming pressure of 100-500kgf/cm<2>; after that, a hot pressing and sintering is achieved by two sections; the heating of the mixture is firstly achieved in a vacuum hot pressing sintering furnace till the temperature is increased to 670-700 DEG C, and the temperature is kept for 5-60 minutes; after ...

Conductive printing ink composite for printing of wireless radio frequency identification devices (RFID)

Adjustable energy-conserving type multifunctional mixer

The invention provides an adjustable multifunctional stirrer, which belongs to a stirring device, and has an electromotor fixed on a transmission box, a main shaft of the transmission box is fixed with one end of a main shaft of a conical tube, and the other end of the main shaft of the conical tube is fixed with a blade seat on which a plurality of blades are arranged, an inner shaft and another inner shaft are respectively disposed in the main shaft of the transmission box and the main shaft of the conical tube, and the other end of the another inner shaft is fixed with an adjusting screw, an adjusting nut is arranged at the outside of the adjusting screw, the adjusting nut and an adjusting body are mounted together, the third shaft of each blade is arranged on a balance wheel, thus the stirrer has advantages of more stable transmission, low noise, high transmission efficiency, reduced energy consumption, stable supporting of the main shafts, high smoothness when in operation, extended ...

High-pressure harmonization processing method of eliminating 700 line aluminium alloy cast ingot crystallization phase

Powdered catalyst for synthesizing diamond containing oxide

A powdered catalyst containing oxide for synthesizing diamond with complete crystal form and high transparency and mechanical properties contains proportionally ordinary Ni-based or Fe-based powder alloy catalyst and one or more of Ta, Sn, Cr, Li, Mg, B, O and their compound.

Thermal treatment method for aluminum alloy

The invention relates to a thermal treatment method which can improve the inter-crystalline corrosion resistance of 6000 series Al-Mg-Si-(Cu) aluminum alloy and does not reduce the tensile property of the alloy at the same time, and belongs to the technical field of thermal treatment of aluminum alloy. The method comprises the following steps: firstly, carrying out solid solution treatment for the 6000 series aluminum alloy at the temperature range of between 520 and 580 DEG C, preserving the heat for 15 to 240 minutes, quenching the aluminum alloy, and then carrying out primary ageing for 15 to 480 minutes at the temperature of between 180 and 240 DEG C; and carrying out secondary ageing for 24 to 2,400 hours at the temperature of between 130 and 170 DEG C, and finally ageing the aluminum alloy for 2 to 10 hours at the temperature of between 180 and 240 DEG C. Compared with the ageing of the conventional T6 peak value, the tensile property of the 6000 series aluminum alloy treated by the ...

Use of electrothermal alloy in six-side top high-temperature high-pressure synthetic cavity

The invention more particularly relates to an electric heating element that uses an electrothermal alloy containing iron, chrome, aluminum, columbium, tantalum and molybdenum as an electric heating element and is applied to a cubic multi-anvil high pressure apparatus for a technique of indirect heating and synthesizing a diamond at high pressure and high temperature. The alloy can also be appliedto the growth of cubic boron nitride, carborundum monocrystal and gallium nitride monocrystal. The heating element rolls the electrothermal alloy with the components of 65 to 80 percent of iron, 13 to 27 percent of chrome, 4 to 7 percent of aluminum and 0.5 to 1 percent of the mixture composed of one or more of columbium, tantalum and molybdenum, into a pellicle with a thickness of 0.05 to 0.3mm,while the pellicle is cut with a certain width and length so as to take the place of a graphite heating pipe in the assembly of indirect heating and synthesizing the diamond. The element of the invention ...

Method for manufacturing man-made polycrystalline diamond nozzle

The invention discloses a method for manufacturing a man-made polycrystalline diamond nozzle. The method comprises the following steps of: evenly coating a hexagonal boron nitride film on a metal wirewith a preset size, and making the coating film thickness be 1 mm; putting the coated metal wire in the center of a mixture of a diamond and metal Co micro powder, and then putting the metal wire andthe mixture into a mould with the nozzle core size of a gem nozzle together; synthesizing a man-made polycrystalline diamond at a temperature of between 1,350 and 1,550 DEG C and under a pressure ofbetween 5.5 and 6.5 GPa; and drawing out the metal wire, and carrying out processing, burnishing, deburring, finishing and grinding by a conventional method to obtain the man-made polycrystalline diamond nozzle with the diameter between 0.10 and 1 mm. The method has the advantages of simple processing process and long service life of the man-made polycrystalline diamond nozzle, and can realize diversification ...

Use of electrothermal alloy in six-side top high-temperature high-pressure synthetic cavity

The invention more particularly relates to an electric heating element that uses an electrothermal alloy containing iron, chrome, aluminum, columbium, tantalum and molybdenum as an electric heating element and is applied to a cubic multi-anvil high pressure apparatus for a technique of indirect heating and synthesizing a diamond at high pressure and high temperature. The alloy can also be applied to the growth of cubic boron nitride, carborundum monocrystal and gallium nitride monocrystal. The heating element rolls the electrothermal alloy with the components of 65 to 80 percent of iron, 13 to 27 percent of chrome, 4 to 7 percent of aluminum and 0.5 to 1 percent of the mixture composed of one or more of columbium, tantalum and molybdenum, into a pellicle with a thickness of 0.05 to 0.3mm, while the pellicle is cut with a certain width and length so as to take the place of a graphite heating pipe in the assembly of indirect heating and synthesizing the diamond. The element of the invention ...