机械合金化PM304粉末的烧结特性

Sintering Characteristic of Mechanically Alloyed PM304 Powder

采用高能球磨方法制备了PM304复合粉末,研究了纳米PM304粉末的真空烧结致密化和显微组织演化现象,并与未球磨粉末的烧结试样进行了比较。结果表明,提高烧结温度和延长烧结时间有利于提高相对密度,同时组织长大。1100℃,2h是最佳烧结工艺。机械合金化导致粉末纳米化,使真空烧结后的显微组织结构明显细化,使试样的相对密度和抗拉强度比未球磨粉末烧结后的试样有显著提高。

The PM304 composite powder was prepared by high energy bailing, and the vacuum sintering densification behavior and the change of microstructure were studied for the mechanical alloying （MA） nanocrystal PM304 composite powder. The research data was compared with those of sample sintered with the normal powder without high energy ball milling. The result shows that the increments of sintering temperature and time arc beneficial to densification, atthe same time, the powder grows with the optimal process of 1100℃ for 2 h. The MA nanopowder promotes the dcnsification and increases the relative density and the tensile strength of sintered sample drastically by contrast with the sample without high energy balling.