CAJ | 학술논문

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1100?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.
위해결Al2O3단섬유예제체제비주기장、점결제편취、사재후역회탄등기술문제,제출일충진공가압습법쾌속성형적신방법.선택MgCl2·MgF2작위점결제,성공제비출체적분수분별위10%,15%,20%,25%적Al2O3단섬유예제체.경다차실험학정료예제체제비과정중적공예삼수여하：45?C홍간2 h,재경제도가열지1100?C소결1.5 h.제득적예제체표관질량량호,무섬유탈락、분층현상,섬유급공극분포균균.압축실험결과증명,소제비적예제체가이만족진공압력침삼적수구.
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.