B4C/SiC whisker/SiC multiphase ceramic matrix composite and preparation method thereof
A composite material and multiphase ceramic technology, applied in the field of ceramic matrix composite materials, can solve the problems of high sintering temperature, poor shock resistance, slow cooling, etc., and achieve the effects of low preparation temperature, improved comprehensive performance, and low infiltration reaction temperature
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Embodiment 1
[0053] An appropriate amount of rice husk is placed in a graphite crucible and subjected to coking treatment at 900° C. for 2 hours under vacuum conditions. The coking treatment product was ground, then placed in a graphite crucible, and kept at 1500°C for 3 hours under vacuum conditions for silicon carbide whisker treatment to obtain a product rich in SiC whiskers and particles. Take 20 g of this product, 70 g of boron carbide powder with an average particle size of 7 μm and 10 g of molybdenum powder with an average particle size of 3 μm, and mix them by mechanical ball milling in absolute ethanol, and then place the ball milled slurry in an oven for drying. Add an appropriate amount of polyvinyl alcohol (PVA) binder with a concentration of 5 wt.% to the dried mixed powder, stir it, dry it and grind it for use. Take an appropriate amount of the powder and put it into a stainless steel mold with a length and a width of 50 mm, and mold it under the condition of 32 MPa, and then...
Embodiment 2
[0055] Take 40 g of the rice husk silicon carbide whisker product described in Example 1, 50 g of boron carbide powder with an average particle size of 3 μm, and 10 g of molybdenum powder with an average particle size of 3 μm and place them in a ball mill jar. Perform ball mill mechanical mixing in the middle, and then dry the mixed slurry. Then add a PVA binder with a concentration of 5 wt.% to the dried powder, and then dry it after stirring. Take 20 g of the dried powder and put it into a stainless steel mold with a length and width of 50 mm, and mold it under the condition of 96 MPa. The molded green body was pre-sintered at 1400°C for 2 hours under vacuum conditions to obtain a preform. The infiltration reaction is performed on the preform in a graphite sintering furnace. Place an appropriate amount of silicon block on the preform, heat it at 1460°C for 40 minutes under vacuum, and then cool it with the furnace to obtain a B of the size of the preform. 4 C / SiC whisker / ...
Embodiment 3
[0057] Put an appropriate amount of rice husk under vacuum conditions and heat it at 900°C for 2 hours for coking treatment, then grind the coked product and heat it at 1550°C for 6 hours under Ar gas atmosphere to carry out silicon carbide whisker treatment to obtain whiskers rich in SiC and particulate products. 60 g of SiC whisker products, 30 g of boron carbide powder with an average particle size of 7 μm, and 10 g of molybdenum powder with an average particle size of 3 μm were mixed by mechanical ball milling in absolute ethanol, and then the ball milled slurry was dried. Then add a PVA binder with a concentration of 5wt.% to the mixed powder, stir and then dry. An appropriate amount of the mixed powder was put into a stainless steel mold with a length and width of 50 mm, and molded under the condition of 96 MPa to obtain a pre-compact, and then the pre-compact was cold isostatically pressed under the condition of 180 MPa. The cold isostatic pressed body is pre-sintered ...
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Abstract
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