上海大学学报(自然科学版) ›› 2014, Vol. 20 ›› Issue (1): 59-67.doi: 10.3969/j.issn.1007-2861.2013.07.044

• 复合材料 • 上一篇    下一篇

真空加压湿法成型Al2O3sf 预制体及其成型质量

张炳凤, 杨方, 周计明, 齐乐华   

  1. 西北工业大学 机电学院, 西安 710072
  • 收稿日期:2013-10-01 出版日期:2014-02-28 发布日期:2014-02-28
  • 通讯作者: 杨方(1958—), 女, 副教授, 研究方向为先进制造工艺与计算机仿真、机械动力学和仿生机器人等. E-mail:gwj@nwpu.edu.cn
  • 基金资助:

    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)

Preparation of Alumina Short Fiber Preform Using Mold Pressing Technique in Vacuum and Its Quality

ZHANG Bing-feng, YANG Fang, ZHOU Ji-ming, QI Le-hua   

  1. School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China
  • Received:2013-10-01 Online:2014-02-28 Published:2014-02-28

摘要: 为解决Al2O3 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MgCl2·MgF2 作为粘结剂, 成功制备出体积分数分别为10%, 15%, 20%, 25% 的Al2O3 短纤维预制体. 经多次实验确定了预制体制备过程中的工艺参数如下: 45 °C 烘干2 h, 再经梯度加热至1 100 °C 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.

关键词: Al2O3sf 预制体, 复合材料, 粘结剂

Abstract: 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·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.

Key words: Al2O3sf preform, binder, composite

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