High-strength silicon carbide-oxide composite material and preparation method thereof
A composite material and oxide technology, applied in the field of refractory materials, can solve the problems of difficult chemical bonding, low mechanical strength, and mutual non-wetting, and achieve the effect of improving mechanical strength, high mechanical strength at room temperature and high temperature, and easy control.
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Embodiment 1
[0025] Weighing and batching of raw materials: 60 kg of fused silicon carbide particles (SiC=97.0%) with a particle size range of 0.5 to 5 mm; alumina fine powder (Al 2 o 3 =98.5) 39 kg; Fe with particle size less than or equal to 50 μm 2 o 3 Powder 1kg.
[0026] Preparation process: (1) Pour the weighed fused silicon carbide particles into the sand mixer, add 2 kg of 5% polyvinyl alcohol aqueous solution, and stir to make the surface of the silicon carbide particles wetted by liquid; Add Fe to the pellets 2 o 3 (3) Add 3 kg of liquid phenolic resin to the granulation material, then add alumina fine powder, and stir evenly to form a semi-dry material; (4) Mix the semi- The dry material is placed in a steel mold and pressed into a refractory green body; (5) The green body is dried at 200°C; (5) The dried green body is heat-treated at a maximum temperature of 1400°C in an atmosphere of buried carbon to obtain silicon carbide - oxide composites.
[0027] Product performanc...
Embodiment 2
[0029] Raw material weighing and batching: 65 kg of fused silicon carbide particles (SiC=98.0%) with a particle size ranging from 0.5 to 5 mm; 33 kg of fused magnesia fine powder (MgO=99.0) with a particle size of 0.1 mm or less; 50 μm or less V 2 o 5 Powder 2 kg.
[0030] Preparation process: (1) Pour the weighed silicon carbide particles into the sand mixer, add 2.5 kg of water-soluble resin, and stir to make the surface of the silicon carbide particles infiltrated by liquid; (2) Add V to the silicon carbide particles 2 o 5 (3) Add 3 kg of liquid furfural resin to the granulation material, then add magnesium oxide fine powder, and stir evenly to form a semi-dry material; (4) Mix the semi-dry The dry material is placed in a wooden mold and pressed into a refractory green body; (5) The green body is dried at 80°C; (5) The dried green body is heat-treated at a maximum temperature of 1600°C in an atmosphere of carbon embedding to obtain silicon carbide - oxide composites.
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Embodiment 3
[0033] Weighing and batching of raw materials: 70 kg of fused silicon carbide particles (SiC=98.5%) with a particle size range of 1 to 3 mm; sintered spinel fine powder (Al 2 o 3 =78.1%, MgO=21.4%) 27 kg; TiO with particle size less than or equal to 30μm 2 Powder 3 kg.
[0034] Preparation process: (1) Pour the weighed silicon carbide particles into the sand mixer, add 1.5 kg of 5% polyvinyl alcohol aqueous solution, stir and then add 2 kg of water-soluble resin, and continue to stir so that the surface of the silicon carbide particles is infiltrated by liquid ; (2) Adding TiO to silicon carbide particles 2 powder, stir evenly to form coated silicon carbide pellets; (3) add 3 kg of dextrin liquid to the pellets, then add spinel fine powder, stir evenly to form semi-dry pellets; (4) add The semi-dry material is placed in a steel mold and pressed into a refractory green body; (5) The green body is dried at 110°C; (5) The dried green body is placed in a circulating N 2 Heat t...
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