摘要
为解决Al_2O_3短纤维预制体制备周期长、粘结剂偏聚、卸载后易回弹等技术问题,提出一种真空加压湿法快速成型的新方法.选择MgCl_2·.MgF_2作为粘结剂,成功制备出体积分数分别为10%,15%,20%,25%的Al_2O_3短纤维预制体.经多次实验确定了预制体制各过程中的工艺参数如下:45℃烘干2 h,再经梯度加热至1 100℃烧结1.5 h.制得的预制体表观质量良好,无纤维脱落、分层现象,纤维及孔隙分布均匀.压缩实验结果证明,所制备的预制体可以满足真空压力浸渗的需求.
To solve the problem related with short fiber preform preparation such as long preparing time, binder segregation and dimensional instability when removed from the mold, a new preform preparation technique was proposed. The method was characterized in short preparation time by using vacuum and pressure. MgCl2＆#183;MgF2 was selected as an effective binder. A series of alumina preforms with different fiber volume fraction of 10%, 15%, 20%and 25%were successfully fabricated. Processing conditions for the preform preparation were as follows： the preform was dried for 2 hours at 45 ？C, and then gradually heated to 1 100 ？C within 1.5 hours. The prepared preform had excellent surface quality, good core strength, and uniform pore and fiber distribution without fiber loss. Compression tests showed that the alumina preforms met the requirements of infiltration experiments for fabricating composites.
出处
《上海大学学报（自然科学版）》
CAS
CSCD
北大核心
2014年第1期59-67,共9页
Journal of Shanghai University:Natural Science Edition
基金
国家自然科学基金资助项目(51275417
51221001)
2013年度留学人员科技活动择优资助项目(2013164)
