为使喷射成型沉积坯底部有模具钢的表面形貌,需要制备上表面有翻制形貌的陶瓷底模.采用硅溶胶预包覆处理的锆英石/氮化硼粉为原料,以硅溶胶为粘结剂,经100 MPa湿压成型、800℃煅烧3 h后,制备了锆英石/氮化硼陶瓷底模.结果表明:底模具有很好的抗热震性和对高钒钢的高温抗侵蚀性;线收缩率为2.5%(1400℃,3 h),抗压强度达64MPa以上,可用高速钢或硬质合金刀具进行切削钻孔;其性能可以满足精密喷射成形陶瓷底模的使用要求.
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