摘要
为探索铜合金热挤压用耐热模具材料的生产工艺 ,将粉末用机械球磨法混合 ,在石墨模中于 130 0～ 135 0℃时热压制备了Ti(C ,N) p/Ni复合材料试样 ,并对试样进行了热循环处理 ,在 90 0℃加热 1h ,再在室温下冷却 1h为1个热循环周期 ,测定了试样的抗弯强度、硬度和内应力 ,并结合复合材料试样的显微组织变化情况分析了热循环处理对复合材料的抗弯强度、硬度和内应力的影响 .结果表明 ,热循环次数从 0次增加到 2 0 0次 ,复合材料的抗弯强度从 2 .38GPa降低到 1.78GPa ;内应力由循环 5 0次时的 2 0MPa减小到热循环 10 0次时的 5MPa;HRA硬度平均值为 80 .85 ,硬度基本保持不变 .这表明 ,用石墨模具热压法制备耐热金属陶瓷颗粒复合材料是可行的 。
To find out a way to produce heat resistance materials for hot extrusion die of Cu alloy, the Ti(C, N) p/Ni composites samples were prepared by hot pressure at 1?300～1?350 ℃ after being mixed by ball milling and were thermal cycled at room temperature to 900 ℃. The bending strength, hardness and inner stress of the samples were measured. The effects of thermal cycle on mechanical properties of composites were analyzed. The results show that the bending strength of sample decreases from 2.38 GPa to 1.78 GPa with the increase of the numbers of thermal cycles from 0 to 200, and the inner stress decreases from 20 MPa to 5 MPa when the number of thermal cycles increase from 50 times to 100 times. The number of thermal cycles has little effects on its hardness, which indicates that it is possible to prepare Ti(C, N) p/Ni composites with the carbon die through hot extrusion.
出处
《中南工业大学学报》
CSCD
北大核心
2002年第3期278-280,共3页
Journal of Central South University of Technology(Natural Science)
关键词
热循环
抗弯强度
硬度
内应力
thermal cycle
bending strength
hardness
inner stress
