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采用高功率横流CO2激光扫描钎料合金与金刚石颗粒。研究了激光工艺参数对钎焊层结合性能及金刚石热损伤的影响,分析了钎焊层与金刚石结合机制及金刚石颗粒在激光作用下的热损伤机制。研究结果表明,激光功率和扫描速度是影响金刚石热损伤及表面浸润的主要因素。在氩气保护下,粉末厚度为0.5 mm,激光光斑直径3 mm,功率为800 W,扫描速度为8.39 mm/s时,可获得金刚石颗粒、钎料合金、金属基体三者具有最佳结合性能的钎焊层。合金粉末对金刚石颗粒浸润良好,并发生冶金化学反应,生成TiC和SiC。当激光输入能量太高时,金刚石颗粒开始与外界的氧发生氧化反应,在自由能方程中的气体分压下,金刚石一直氧化,直到与氧化物处于平衡状态。这一过程表现为金刚石颗粒石墨化,逐步氧化烧损变成气体。
High power cross-flow CO2 laser scanning of solder alloy and diamond particles. The effects of laser process parameters on the bonding properties of brazing layer and the thermal damage of diamond were studied. The bonding mechanism between brazing layer and diamond and the thermal damage mechanism of diamond particles under laser irradiation were analyzed. The results show that the laser power and scanning speed are the main factors affecting the thermal damage and surface infiltration of diamond. Under the protection of argon gas, the diamond particles, the solder alloy and the metal matrix have the best combination when the powder thickness is 0.5 mm, the laser spot diameter is 3 mm, the power is 800 W and the scanning speed is 8.39 mm / s Performance of the brazing layer. The alloy powder infiltrated the diamond particles well and produced metallurgical reactions to form TiC and SiC. When the laser input energy is too high, the diamond particles begin to oxidize with oxygen in the outside world. Under the partial pressure of gas in the free energy equation, the diamond has been oxidized until it is in equilibrium with the oxide. This process shows the graphitization of diamond particles, which gradually oxidize and burn into gas.