Preparation method of nitride modified boron carbide composite ceramic
A technology of composite ceramics and boron carbide, which is applied in the field of preparation of nitride-modified boron carbide composite ceramics, can solve the problems of low fracture toughness, high atomic activation energy, and low sintering activation energy, and achieve the improvement of bending strength and hardness, Good mechanical properties, high density effect
Inactive Publication Date: 2019-04-12
WUXI LONGSHAN TECH +1
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Problems solved by technology
[0003] Although boron carbide has been widely used due to its excellent performance, boron carbide ceramics have low fracture toughness, strong covalent bonds between atoms, high atomic activation energy, and low sintering activation energy. Sintered body with high density in size is very difficult
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0013] Mix boron carbide raw materials with ALN, TiN nitride, phenolic resin and PVA resin, mix them into a grinding tank, use silicon nitride balls for grinding, ball mill for 24 hours, and pass through a 300-mesh sieve to obtain a particle with an average particle size of 0.65 μm. For sub-micron raw materials, after discharge, the composite raw materials are dried at 200°C.
[0014] The dried composite raw materials are crushed and sieved several times to obtain ceramic raw materials with a set particle size. The ceramic raw materials are added into the mold cavity and pressed under a pressure of 80MPa-220MPa for pre-sintering. The sintering temperature is The temperature is controlled at 1000°C-1200°C. After forming, the size of the body is trimmed, and it is pressed into a large-sized bulletproof ceramic body with a thickness of 30mm and a side length of more than 300mm.
[0015] Put the formed bulletproof ceramic body into a vacuum pressureless sintering furnace, and carr...
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Abstract
The invention provides a preparation method of nitride modified boron carbide composite ceramic. The boron nitride composite ceramic finished product is prepared through the steps of matching and processing ceramic raw materials, carrying out pre-pressing forming, and carrying out vacuum nitridation sintering. Through the adoption of the method disclosed by the invention, the density of the prepared nitride modified boron nitride composite ceramic reaches 2.51 g / cm<3>, the bending strength is 338 MPa, the hardness is 32.10 GPa, and the mechanical property is good. A large-size ceramic sheet has a large density, and the bending strength and hardness are obviously improved compared with the bending strength and hardness of an ordinary boron carbide ceramic sheet. The preparation method is suitable for being applied as a preparation method the modified boron nitride composite ceramic.
Description
technical field [0001] The invention relates to the field of protection and explosion protection for national defense and military industry, and specifically relates to a method for preparing nitride-modified boron carbide composite ceramics. Background technique [0002] Boron carbide (B4C) is a high-hardness material second only to diamond and cubic boron nitride. It is also a compound with strong covalent bonds. It has low density, high hardness, high modulus, and good wear resistance. Excellent performance, widely used in national defense, machinery, aerospace, petrochemical and other fields. This material is the main bulletproof material for ceramic plates and has great application potential in lightweight armor materials. [0003] Although boron carbide has been widely used due to its excellent performance, boron carbide ceramics have low fracture toughness, strong covalent bonds between atoms, high atomic activation energy, and low sintering activation energy. Dimen...
Claims
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IPC IPC(8): C04B35/563C04B35/622
CPCC04B35/563C04B35/622C04B2235/3865C04B2235/3886
Inventor 徐涛张塬伊恒彬
Owner WUXI LONGSHAN TECH