碲对镍铬合金耐磨损性能的影响

在镍铬合金粉末中加入微量碲元素,通过球磨机械搅拌混合后,采用氧乙炔非真空烧结工艺制备试样,用HBRV-187.5布洛维硬度仪、MMW-1立式万能摩擦磨损试验机和扫描电镜检测合金的洛氏硬度、耐磨损性能、磨损形貌和摩擦系数等性能.试验表明:合金在无润滑干摩擦条件下,碲的质量分数为0.8%～1.0%时,具有最高的洛氏硬度、最少的磨损失重量、最少的磨损脱落,很浅的沟槽及很稳定的摩擦系数曲线.由于微量碲元素的加入,合金生成新的相,起到提高合金硬度和稳定合金磨损性能的作用.

Effect of tellurium on abrasion resistance performance of nickel-chrome alloy

Alloy sample preparation was investigated by adding trace tellurium elements into nickel-chrome alloy powder,with subsequent ball milling and mechanical-stir mixing,and final oxyacetylene non-vacuum sintering.Using HBRV-187.5 Brinell Rockwell and Vickers hardness tester,MMW-1 universal friction and wear tester,and scanning electron microscope(SEM),the performance indices such as Rockwell hardness,wear resistance,wear morphology and friction coefficient were tested.The test showed that when there was no lubrication with dry friction,the alloy with addition of tellurium mass-fraction of 0.8% to 1.0% would exhibit the highest Rockwell hardness,the least weight loss and fall off due to grinding,and a smoother and very stable friction coefficient curve.Due to adding trace tellurium elements within the alloy,a new phase would be generated,playing a role of improvement of alloy hardness and stabilization of alloy abrasion performance.