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分别在敞开和密闭系统中进行纯钛和纯镍的气相渗铝实验。渗铝实验在1100℃下进行3h,包埋粉末含10%Al、5%NH4Cl和85%Al2O3。在敞开条件下,渗铝后纯钛的表面会生成α(Al)固溶体,样品的质量损失达到32.37%。然而,在密闭条件下,纯钛样品的表面生成TiAl3层和α(Al)固溶体,没有质量损失。热力学分析表明,在敞开条件下对纯钛渗铝时,会生成钛的氯化物,导致其质量减少。而在密闭条件下,由于生成的氯化物会达到平衡状态而使生成反应停止。相反,无论是在敞开或密闭条件下,纯镍样品都可以进行表面渗铝,不会导致质量损失。在两种状态下,镍的表面都生成了AlNi和Ni3Al相。
The aluminized experiments of pure titanium and pure nickel were carried out in open and closed systems respectively. The aluminizing experiments were carried out at 1100 ° C for 3h. The embedded powders contained 10% Al, 5% NH4Cl and 85% Al2O3. Under the open condition, α (Al) solid solution was formed on the surface of pure titanium after aluminizing, the mass loss of the sample reached 32.37%. However, the TiAl3 layer and α (Al) solid solution were formed on the surface of the pure titanium sample without any mass loss under confined conditions. Thermodynamic analysis shows that, when titanium is exposed to pure titanium under an open condition, titanium chloride is generated, resulting in a decrease in its mass. Under confined conditions, the formation reaction is stopped because the chloride formed will reach an equilibrium state. In contrast, pure nickel samples can be surface aluminized, either in open or closed conditions, without loss of quality. In both states, AlNi and Ni3Al phases are formed on the surface of nickel.