论文部分内容阅读
热等静压用陶瓷模既要具有一定的室温强度，又要具有良好的高温塑性变形能力，因而需要采取特殊的烧结工艺。本工作分析了加热过程中陶瓷模中的物理、化学变化，设计了缓慢加热／冷却、分段保温的烧结方法。研究结果表明，陶瓷模材料中的ＳｉＯ２颗粒在烧结过程中发生了多次晶型转变，并伴随有强烈的体积变化。采用设计的烧结方法，较好地控制了因晶型转变而引起的体积变化，避免了陶瓷模开裂或畸变。此外还发现，加入ＭｇＯ和ＴｉＯ２助烧剂，显著降低了烧结温度，使陶瓷模可在１１００℃左右烧结。
Hot isostatic pressing ceramic mold with both a certain room temperature strength, but also has good high temperature plastic deformation capacity, which requires the use of special sintering process. This work analyzes the physical and chemical changes in the ceramic mold during the heating process, and designs the sintering method of slow heating / cooling and segmented thermal insulation. The results show that the SiO2 particles in the ceramic mold material undergo multiple crystal transformation during the sintering process accompanied by a strong volume change. The design of the sintering method, better control of the volume change caused by the crystal change, to avoid the cracking of ceramic mold or distortion. In addition, it was also found that the addition of MgO and TiO2 sintering aids significantly reduced the sintering temperature so that the ceramic mold could be sintered at around 1100 ℃.