焙烧温度及保温时间对硅酸铝纤维复合硅溶胶型壳强度的影响  

Effects of Fired Temperature and Heat Preservation Time on Fired Strength of Fiber Reinforced Shell for Investment Casting

作　　者：赵泽宇[1] 吕凯[1,2] 刘向东[1,2] 王建民[1] 李达[1] 宋晓勇[1] 杜赵新[1] 

机构地区：[1]内蒙古工业大学材料科学与工程学院,内蒙古呼和浩特010051 [2]内蒙古自治区材料成型及控制工程重点实验室,内蒙古呼和浩特010051

出　　处：《铸造技术》2016年第6期1176-1178,共3页Foundry Technology

基　　金：内蒙古工业大学"大学生创新实验计划"资助项目(2015031)

摘　　要：通过改变熔模铸造用硅酸铝纤维复合型壳的焙烧温度和保温时间等焙烧工艺,研究其抗弯强度的变化规律。利用SEM对弯曲断裂型壳试样的断口形貌进行观察。实验结果表明,纤维增强型壳的焙烧后抗弯强度提高,在焙烧温度为925℃时达到最大,为3.8 MPa。焙烧温度为950℃时,焙烧后强度随保温时间延长而增大,保温时间为120 min时最大,随后有所降低。断口SEM观察表明,硅酸铝纤维主要依靠其变形和断裂分担载荷。The effects of fired temperature and heat preservation time on fired strength of fiber reinforced shell were researched. The fracture surface of shell specimens were observed by SEM. The results show that the fired strength of shell reaches the maximum of 3.8 MPa when fired temperature at 925 ℃. With the fired temperature at 950℃, the fired strength of the shell increases with the increase of heat preservation time, over 120 min, the fired strength decreases little. It is found by SEM observation that the bending load are borne by deformation and fracture of aluminum silicate fibers.

关 键 词：纤维复合型壳 熔模铸造 焙烧温度 强度 保温时间 

分 类 号：TG233.7[金属学及工艺—铸造]