GH4169渗氮层形貌特征及结构的初步探讨

国外引进汽轮机组中的氮化阀杆材料为高温合金In718(转化国内材料牌号GH4169),通过对该材料气体氮化后随炉试样的初步检测,从而对该材料的渗氮层的形貌特征和渗层结构进行初步探讨。     

射频等离子体化学气相沉积择优取向膜的研究

用射频等离子体沉积择优取向的ＴｉＮ膜，用Ｘ－衍射的方法分析影响取向的原因。     

氧氮分析仪手动模式测定氮化锰中的氮

采用TC-600氧氮分析仪手动模式测定了氮化锰中的氮,有效防止了样品熔融时的飞溅现象,并利用硝酸铅基准物质制作工作曲线,将测定结果与化学法所得结果进行了对比,精密度较好.     

Oxidation mechanisms of low energy-high flux nitrided ODS FeAl intermetallic alloy

Abstract

Microscopy studies of low energy-high flux nitrided ODS FeAl Grade 3 intermetallic alloy reveal a surface containing a random distribution of protrusions anchored by yttria particles. The cross section analyses show the formation of an outer compact layer containing hexagonal AlN followed by an inner diffusion layer containing AlN and a segregation of α-Fe. The high temperature isothermal oxidation behaviour is subsequently evaluated at 800°C for 24 h. The nitrided layer is observed to induce a change in the oxidation mechanisms compared to the untreated material. As a result of the outer diffusion of Fe a Fe₂O₃ scale is first established at the gas/metal interface, followed by an intermediate α-Al₂O₃ layer. The original substrate also seems to be oxidised to give rise to a spinel layer the oxide/alloy interface.     

未渗氮和渗氮38CrMoAl钢在盐雾环境中的初期腐蚀行为

目的 研究未渗氮和渗氮38CrMoAl钢在模拟海洋大气环境中的初期腐蚀特征和电化学腐蚀行为.方法 通过对未渗氮和渗氮38CrMoAl 钢试件进行盐雾试验来模拟其在海洋大气环境中的初期腐蚀行为,并对不同腐蚀周期后的试件进行表面形貌、腐蚀速率、FT-IR、动电位极化、电化学阻抗和微区电化学分析及研究.结果在盐雾试验中未渗氮...