A kind of air pressure solid-phase sintered boron carbide composite ceramics and its preparation method
A solid-phase sintering, multi-phase ceramic technology, applied in the field of boron carbide ceramics, can solve the problems of difficult reaction, influence of material strength, poor connection, etc., to achieve good bonding between grain boundaries, lower sintering temperature, and clean grain boundary surface. Effect
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[0013] A preparation method of gas pressure solid-phase sintered boron carbide composite ceramics, which comprises the following steps:
[0014] S1, mixing
[0015] Using sub-micron boron carbide powder, titanium carbide powder, sintering aid, carbon source and organic binder as raw materials, put the raw materials into a mixer and mix them with water for 6 hours. After mixing, sieve through a 40-60 mesh sieve.
[0016] The raw materials include 70-90% of submicron boron carbide powder, 0.1-20% of titanium carbide powder, 0.1-10% of sintering aid, 4-20% of carbon source and 5-20% of organic binder in terms of mass percentage;
[0017] Preferably, the particle size of the submicron boron carbide powder is 0.50-0.90 microns, and the purity is greater than 92%; preferably, the particle size of the titanium carbide powder is 0.1-2.0 microns, and the purity is greater than 90%.
[0018] In this embodiment, submicron boron carbide fine powder and titanium carbide are used as the ma...
Embodiment 1
[0038] This embodiment provides a method for preparing a gas-pressure solid-phase sintered boron carbide composite ceramic, which includes the following steps:
[0039] S1, mixing of raw materials: get 75 kilograms of boron carbide powders with a particle size of 0.5 microns and a purity of 92.1%, 10 kilograms of titanium carbide powders with a particle size of 0.1 microns and a purity of 95%, silicon carbide powders (0.5 microns with a purity of 99%) ) 0.1 kilogram, 7.9 kilograms of acrylic resin, 7 kilograms of polyvinyl alcohol, put above-mentioned raw material into the mixer and add pure water, mix after 6 hours, cross 60 mesh sieves;
[0040] S2. Spray granulation: The sieved slurry is granulated through a spray granulation tower, the inlet temperature of the spray granulation tower is 260°C, and the outlet temperature is 120°C; the granulated material is passed through a 60-mesh sieve to obtain loose packing The density is 0.80g / cm 3 , a material with a fluidity of 20s / ...
Embodiment 2
[0045] This embodiment provides a method for preparing a gas-pressure solid-phase sintered boron carbide composite ceramic, which includes the following steps:
[0046] S1, mixing of raw materials: get 90 kilograms of boron carbide powders with a particle size of 0.9 microns and a purity of 99.7%, 0.1 kilograms of titanium carbide powders with a particle size of 2.0 microns and a purity of 90%, and silicon nitride powders (2 microns in particle size with a purity of 95%). %) 1 kg, 1 kg of modified aluminum nitride powder (particle size 0.5 micron, purity 99%), 1.9 kg of phenolic resin, 6 kg of dextrin, put the above raw materials into the mixer and add pure water, after mixing for 48 hours , through a 120-mesh sieve;
[0047] S2. Spray granulation: The sieved slurry is granulated through a spray granulation tower, the inlet temperature of the spray granulation tower is 180°C, and the outlet temperature is 60°C; the granulated material is passed through a 120-mesh sieve to obta...
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