A kind of silicon carbide ceramic thick ballistic plate and its preparation method and application
A technology of silicon carbide ceramics and bulletproof plates, applied in protective equipment, offensive equipment, armor, etc., can solve problems affecting material strength, black cores, cracks, etc., and achieve the effect of low density and not easy to settle
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Embodiment 1
[0053] This embodiment provides a method for preparing a silicon carbide ceramic thick bulletproof plate, comprising the following steps:
[0054] 1) Add 800g of lignocellulose powder H-500 (30μm in diameter, 1:1.5 aspect ratio), 8g of polyvinylpyrrolidone K90, and 12g of sodium carboxymethylcellulose into 2000g of absolute ethanol, stir evenly, and pass Add 2g of ammonia water with a concentration of 30wt% dropwise to adjust its pH value to 11 to obtain an ethanol slurry containing lignocellulose;
[0055] 2) Pour the slurry obtained in step 1) into an open container, dry at room temperature for 4 days, the ethanol is fully volatilized, and the slurry becomes loose particles containing lignocellulose; the loose particles are ground in a mortar for 1 The active powder that contains lignocellulose is formed within an hour; the active powder is passed through a 250 mesh sieve afterwards to obtain a powder with a certain particle size distribution;
[0056] 3) In 2000g deionized...
Embodiment 2
[0064] This embodiment provides a method for preparing a silicon carbide ceramic thick bulletproof plate, comprising the following steps:
[0065] 1) Add 1042.14g (lignocellulose powder H-500 with a diameter of 50μm and an aspect ratio (1:1.5)), 71.6g of polyvinylpyrrolidone K90 and 31.6g of sodium carboxymethylcellulose (CMC) to 3000g in sequence. In the ionized water, the ball mill was mixed for 24 hours to make it evenly mixed, and the ball milling speed was 30 rpm, and the pH value of the slurry was adjusted to 10 by dropping 2 g of ammonia water with a concentration of 25 wt%.
[0066] 2) Pour the water-based slurry obtained in step 1) into an open metal barrel, and air-dry it in an oven at 60°C for 4 days to form a dry block, and then grind the block with a mortar, forming an active powder containing lignocellulose; then passing the active powder through a 250-mesh sieve to obtain an active powder containing lignocellulose with a certain particle size distribution.
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Embodiment 3
[0074] This embodiment provides a method for preparing a silicon carbide ceramic thick bulletproof plate, comprising the following steps:
[0075] 1) Add 802.4g of lignocellulose powder H-500 (50μm in diameter, 1:1.3 aspect ratio), 25g of polyvinylpyrrolidone, and 20g of sodium carboxymethylcellulose into 2500g of deionized water in turn, and mix them by ball milling for 24 hours. It is mixed evenly, the ball milling speed is 50 rpm, and the pH value is adjusted to 11 by dropping 2g of ammonia water with a concentration of 28wt%;
[0076] 2) Pour the water-based slurry obtained in step 1) into an open metal bucket, and air-dry it in an oven at 30°C for 3 days to form a dry block, and then grind the block with a mortar, forming an active powder containing lignocellulose; then passing the active powder through a 250-mesh sieve to obtain a powder with a certain particle size distribution;
[0077] 3) Add 600g of acrylamide and 60g of N-N'methylene bisacrylamide to 2000g of deion...
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