热压铸法制备偏铝酸锂陶瓷薄壁管的研究

以固相反应法合成出的LiAlO2细粉作为原料,采用改进的热压铸活塞法压制出薄壁管生坯,并对脱蜡后的素坯进行微波烧结与常规烧结两种不同工艺试验的比较,从产氚机理、粉体煅烧温度、颗粒尺寸、表面活性剂种类和烧结工艺等方面展开了较为系统的研究.实验结果表明,微波烧结不仅可以有效地降低烧结温度和缩短保温时间,使晶粒细化均匀,还能提高样品的抗压强度,非常有利于提高氚固体增殖剂的最终产氚性能.

Hot Pressure Casting Process of Thin-Wall Tubelike Specimens of Lithium Aluminate Ceramics

Using fine powders of lithium aluminate synthesized by the solid-state reaction as the starting materials, porous thin-wall tubelike specimens were fabricated by the improved hot pressure casting method. This process was studied from the following aspects such as the mechanism of tritium release, calcine temperature, particle size, modifying agent and the process of sintering. Compared with conventional sintering, much finer grain, increased compressive strength and more homogeneous microstructure could be achieved in microwave processing, due to decreased sintering temperature and an enhanced densification rate, and such values were very suitable for the tritium breeding materials.