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Method for preparing high-density ceramic through pressureless sintering of beta-SiC powder synthesized through self-propagating combustion
The invention provides a method for preparing high-density ceramic through pressureless sintering of beta-SiC powder synthesized by self-propagating combustion. The method comprises the following steps: (1) mechanical activation; (2) pickling and purifying; (3) ball-milling and pulping; (3) dry pressing molding; and (4) pressureless sintering. According to the invention, the beta-SiC powder synthesized by self-propagating combustion is subjected to mechanical activation and pickling purification, so that the surface activation energy is improved, the purity is improved, and the high-performance submicron powder suitable for sintering is prepared. And by controlling sintering aids C and B and a sintering process, the beta-SiC powder synthesized by self-propagating combustion is used as a raw material to prepare the compact beta-SiC ceramic material with excellent mechanical properties. When the addition amount of B is 0.7 wt% and the addition amount of C is 4 wt%, under the conditions that the sintering temperature is 2100 DEG C and the heat preservation time is 90 min, the prepared SiC ceramic has the optimal density and mechanical property, the ignition loss is 7.9%, the shrinkage rate is 15.6%, the density is 3.14 g/m<3>, the hardness is 25.62 +/-0.92 GPa, the fracture toughness is 4.84 +/-0.84 MPa.m<1/2>, and the three-point bending strength is 401.74 +/-8.66 GPa.
本发明提供了一种自蔓延燃烧合成β‑SiC粉无压烧结制备高密度陶瓷的方法，包括以下步骤：(1)机械激活；(2)酸洗纯化；(3)球磨制浆；(3)干压成型；(4)无压烧结。本发明采用自蔓延燃烧合成的β‑SiC粉，通过机械激活、酸洗纯化，提高表面活化能、提高纯度，制备了适合烧结的高性能亚微米级粉体。再通过控制烧结助剂C、B及烧结工艺，以期利用自蔓延燃烧合成β‑SiC粉作为原料，制备获得致密的、力学性能优异的β‑SiC陶瓷材料。当B添加量为0.7wt％，C添加量为4wt％时，在烧结温度为2100℃，保温时间90min的条件下，制备的SiC陶瓷的致密度和力学性能最佳，其烧失率7.9％、收缩率15.6％、密度3.14g/m3，硬度25.62±0.92GPa，断裂韧性4.84±0.84MPa·m1/2，三点抗弯强度401.74±8.66GPa。
Method for preparing high-density ceramic through pressureless sintering of beta-SiC powder synthesized through self-propagating combustion
The invention provides a method for preparing high-density ceramic through pressureless sintering of beta-SiC powder synthesized by self-propagating combustion. The method comprises the following steps: (1) mechanical activation; (2) pickling and purifying; (3) ball-milling and pulping; (3) dry pressing molding; and (4) pressureless sintering. According to the invention, the beta-SiC powder synthesized by self-propagating combustion is subjected to mechanical activation and pickling purification, so that the surface activation energy is improved, the purity is improved, and the high-performance submicron powder suitable for sintering is prepared. And by controlling sintering aids C and B and a sintering process, the beta-SiC powder synthesized by self-propagating combustion is used as a raw material to prepare the compact beta-SiC ceramic material with excellent mechanical properties. When the addition amount of B is 0.7 wt% and the addition amount of C is 4 wt%, under the conditions that the sintering temperature is 2100 DEG C and the heat preservation time is 90 min, the prepared SiC ceramic has the optimal density and mechanical property, the ignition loss is 7.9%, the shrinkage rate is 15.6%, the density is 3.14 g/m<3>, the hardness is 25.62 +/-0.92 GPa, the fracture toughness is 4.84 +/-0.84 MPa.m<1/2>, and the three-point bending strength is 401.74 +/-8.66 GPa.
本发明提供了一种自蔓延燃烧合成β‑SiC粉无压烧结制备高密度陶瓷的方法，包括以下步骤：(1)机械激活；(2)酸洗纯化；(3)球磨制浆；(3)干压成型；(4)无压烧结。本发明采用自蔓延燃烧合成的β‑SiC粉，通过机械激活、酸洗纯化，提高表面活化能、提高纯度，制备了适合烧结的高性能亚微米级粉体。再通过控制烧结助剂C、B及烧结工艺，以期利用自蔓延燃烧合成β‑SiC粉作为原料，制备获得致密的、力学性能优异的β‑SiC陶瓷材料。当B添加量为0.7wt％，C添加量为4wt％时，在烧结温度为2100℃，保温时间90min的条件下，制备的SiC陶瓷的致密度和力学性能最佳，其烧失率7.9％、收缩率15.6％、密度3.14g/m3，硬度25.62±0.92GPa，断裂韧性4.84±0.84MPa·m1/2，三点抗弯强度401.74±8.66GPa。
Method for preparing high-density ceramic through pressureless sintering of beta-SiC powder synthesized through self-propagating combustion
自蔓延燃烧合成β-SiC粉无压烧结制备高密度陶瓷的方法
LU YOUJUN (author) / LIN LIQUN (author) / LI MAOHUI (author) / ZHANG MINGJUN (author) / LIU XIANG (author) / YANG LUTONG (author)
2022-01-21
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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