By using a Gleeble-1500 thermal and mechanical material testing machine, the authors have welded the Al-Matrix composites material by the diffusion welding method, and studied the effects of the surface treatment cond...By using a Gleeble-1500 thermal and mechanical material testing machine, the authors have welded the Al-Matrix composites material by the diffusion welding method, and studied the effects of the surface treatment conditions of the joint before welding on the joint performance and painted out there are a lot of the different surface treatment conditions. These influences and the influence excessively by high grinding of the surface of joints before welding are helpful to raising the strength of the joint in vacuum diffusion welding. The suitable grinding with suitable welding parameters, the joint strength can reach 90% of that of the base material, and also studied the reason thoroughly by using SEM. XRD. etc.展开更多
文摘By using a Gleeble-1500 thermal and mechanical material testing machine, the authors have welded the Al-Matrix composites material by the diffusion welding method, and studied the effects of the surface treatment conditions of the joint before welding on the joint performance and painted out there are a lot of the different surface treatment conditions. These influences and the influence excessively by high grinding of the surface of joints before welding are helpful to raising the strength of the joint in vacuum diffusion welding. The suitable grinding with suitable welding parameters, the joint strength can reach 90% of that of the base material, and also studied the reason thoroughly by using SEM. XRD. etc.
文摘根据直升机传动系统干运转能力的要求,用销盘试验机测定了M o离子注入量及润滑条件对齿轮钢12C r2N i4A摩擦副摩擦因数和磨损量的影响。结果表明:M o离子注入对摩擦因数影响很小,但可大大降低磨损率,对增强材料耐磨性有很好的作用。在FZG齿轮试验机上进行了齿轮改性前后的对比试验,结果表明,未改性齿轮干运转30 m in后齿面明显胶合,而改性处理后的齿轮经45 m in干运转试验,齿轮工作良好,齿面光整,仍然可以继续使用,具有很好的干运转性能。
