PA66纤维含量对多孔铝基陶瓷型芯气孔率的影响

Influence of PA66 fiber content on porosity ofporous aluminum based ceramic core

为了解决氧化铝陶瓷型芯不易脱芯的难题,加入一定量的PA66纤维作为成孔材料,以热压注的方法制备多孔铝基陶瓷型芯。研究PA66纤维含量对铝基陶瓷型芯气孔率,室温抗弯强度和烧结收缩率的影响;分析PA66纤维含量对氧化铝陶瓷型芯气孔率的影响机理。结果表明:PA66纤维的加入显著提高了氧化铝陶瓷型芯的气孔率,有效延缓了型芯的烧结收缩;随着PA66纤维加入量的增多,氧化铝陶瓷型芯气孔率增大,室温抗弯强度和线收缩率均减小。当PA66纤维含量为0.9%(质量分数)时,氧化铝陶瓷型芯的气孔率为41.14%,抗弯强度为15.33 MPa,线收缩率为0.418%。

In order to solve the problem that alumina based ceramic core is not easy to remove core,a certain amount of PA66 fiber was added as pore forming material to prepare porous aluminum based ceramic core by hot pressing.The influence of PA66 fiber content on the porosity,room temperature bending strength and sintering shrinkage of aluminum based ceramic core was investigated,and the mechanism of PA66 fiber content on the porosity of aluminum based ceramic core was analyzed.The results show that the porosity of alumina based ceramic core is significantly increased by adding PA66 fiber,and the sintering shrinkage of the core is effectively blocked.With the increase of PA66 fiber,the porosity of alumina based ceramic core is increased,and the bending strength and line shrinkage rate at room temperature are decreased.When the PA66 fiber content is 0.9%(mass fraction),the porosity of the aluminum based ceramic core is 41.14%,the bending strength is 15.33 MPa,and the linear shrinkage rate is 0.418%.