Method for preparing boron carbide composite material
A composite material and boron carbide technology, which is applied in the field of composite material preparation, can solve the problems of low density and high brittleness of boron carbide materials, and achieve the effects of low preparation environment and equipment requirements, increasing density and reducing production costs.
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example 1
[0015] Example 1: Forming ingredients, adding TiO at a mass fraction of 30% 2 , its purity is 99wt%, the balance is B 4 C, the purity is 98wt%, of which A powder d 50 =1μm, B powder d 50 = 20 μm, A and B are added at a mass ratio of 0.25, mixed by ball milling, the medium is absolute ethanol, and the grinding balls are corundum balls. After the material is ball milled for 24 hours, it is dried at 60°C for 18 hours, and a phenolic resin-acetone solution binder is added according to 15% of the total mass fraction of the material. The content of phenolic resin in the binder is 50wt%, and then granulated with a 60-mesh sieve, and Molded at 150MPa, the formed sample was dried at 100°C for 12h.
[0016] Pressureless pre-firing, place the preform in a vacuum sintering furnace, evacuate to 100Pa, then raise the temperature to 2050 °C at a rate of 5 °C / min, and keep it for 30 min to obtain a boron carbide-based porous pre-sintered body.
[0017] Vacuum infiltration, the porous calc...
example 2
[0018] Example 2: Forming ingredients, adding TiO at a mass fraction of 50% 2 , its purity is 99wt%, the balance is B 4 C, the purity is 98wt%, of which A powder d 50 =1μm, B powder is d 50 = 20 μm, A and B are added at a mass ratio of 0.3, mixed by ball milling, the medium is absolute ethanol, and the grinding balls are corundum balls. After the material was ball milled for 24 hours, it was dried at 60°C for 18 hours, and a phenolic resin-acetone solution binder was added according to 15% of the mass fraction of the material. The content of phenolic resin in the binder was 50wt%, and then granulated with a 60-mesh sieve. Compression molding was performed under 150MPa, and the formed samples were dried at 100°C for 12 hours.
[0019] Pressureless pre-firing, place the preform in a vacuum sintering furnace, evacuate to 100Pa, then raise the temperature to 2050 °C at a rate of 5 °C / min, and keep it for 30 min to obtain a boron carbide-based porous pre-sintered body.
[0020]...
example 3
[0021] Example 3: Forming ingredients, adding ZrO at 5% mass fraction 2 , its purity is 99.5wt%, the balance is B 4 C, the purity is 99wt%, of which A powder d 50 =0.5μm, B powder d 50 =10 μm, A and B are added at a mass ratio of 0.1, mixed by ball milling, the medium is absolute ethanol, and the grinding balls are corundum balls. After the material was ball milled for 24 hours, it was dried at 60°C for 18 hours, and a phenolic resin-acetone solution binder was added according to 10% of the mass fraction of the material. The content of phenolic resin in the binder was 50wt%, and then granulated with a 24-mesh sieve. Compression molding was performed under 100MPa, and the formed samples were dried at 100°C for 12 hours.
[0022] Pressureless pre-firing, the preform is placed in a vacuum sintering furnace, vacuumed to 50Pa, then heated to 2060 °C at a rate of 8 °C / min, and kept for 60 min to obtain a boron carbide-based porous pre-sintered body.
[0023] Vacuum infiltration,...
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