WC/45钢复合材料的温压烧结工艺及其磨损性能

Preparation of Warm Compacted and Sintered WC/45 Steel Composite and Its Wear-Resistance

选取尺寸为0 076～0 100mm的WC颗粒为增强相,45钢为基体,系统地研究了粉末冶金真空烧结法制备颗粒增强钢基复合材料的温压烧结工艺,考察了常温压制烧结和温压烧结两种工艺条件下材料的滑动摩擦磨损性能.结果表明:对于50%WC+50%45钢(质量分数)粉末,采用硬脂酸锌作润滑剂,在压制温度为140℃、压力为320kN时,得到了较为理想的压坯密度(9 4362g/cm3),其相对密度达到91 6%,比常温压制的压坯密度(9 1292g/cm3)提高了3 4%.销盘磨损试验结果表明:温压试样的耐磨性分别是15Cr高铬铸铁的2 9倍,20Cr高铬铸铁的2 6倍,同样工艺条件下常温压制试样的2 8倍.通过扫描电镜分析了复合材料的磨损机理.

The WC particles (0.076 mm-0.100 mm in size) are selected as reinforced phase, and 45 steel (carbon steel with 0.45%C) as matrix The techniques of warm compaction are systematically investigated with powder metallurgy solid phase sintering method. The performance of sliding friction wear of the composites is tested on a pin on disk tester. The test results of warm compaction show that the composite sample containing 50%WC and 50% 45 steel possesses the perfect compaction density (9.4362 g/cm3) and the relative density reaches 91.6% under the condition of 140°C compaction temperature, 320 kN stress, and lubricated with zinc stearate. The results of wear test show that the composite sample under the condition of warm compaction gains the best wear property, and the relative wear resistance is the 2.9 times of 15Cr cast iron, 2.6 times of 20Cr cast iron and 2.8 times of the composite sample under the condition of room temperature compaction. And the wear mechanism of particle composites is analyzed by SEM.