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发明公开
CN107973613A 一种超高温多孔YbB6陶瓷的制备方法 无效 - 撤回

一种超高温多孔YbB6陶瓷的制备方法
摘要：
本申请公开了一种超高温多孔YbB6陶瓷的制备方法，包括步骤：(1)、以Yb2O3粉末和B4C粉末为原料混合；(2)、球磨；(3)、烘干、过筛；(4)、造粒：在Yb2O3/B4C粉末中加入8wt％的聚乙烯醇，充分研磨后再过筛；(5)、干压成型：将造粒好的粉料在180MPa的压力下压制成坯体，坯体的密度在1.5～1.8g/cm3；(6)、烧结：在氩气气氛下，按照3～5℃/min速率升至1600～1700℃保温1～2小时；(7)、冷却至室温。本发明通过调节坯体的密度可以控制多孔陶瓷的孔隙率和体收缩率，获得的陶瓷材料具有均匀的孔结构，孔隙率为61.7％，并且达到高的压缩强度23.1MPa。
摘要（英）：

The present invention discloses an ultra-high temperature porous YbB6 ceramic preparation method, which comprises: (1) mixing raw materials such as Yb2O3 powder and B4C powder; (2) carrying out ball milling; (3) drying, and screening; (4) granulating: adding 8 wt% of polyvinyl alcohol t the Yb2O3/B4C powder, completely grinding, and screening; (5) carrying out dry pressing molding: pressing the granulated powder under a pressure of 180 MPa to obtain a billet, wherein the density of the billet is 1.5-1.8 g/cm<3>; (6) sintering: heating at a rate of 3-5 DEG C/min in an argon atmosphere to a temperature of 1600-1700 DEG C, and carrying out thermal insulation for 1-2 h; and (7) cooling to a room temperature. According to the present invention, the porosity and the body shrinkage rate of the porous ceramic can be controlled by adjusting the density of the billet, and the obtained ceramic material has the uniform pore structure, has the porosity of 61.7%, and can achieve the high compressivestrength of 23.1 MPa.

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