摘要
利用前驱体碳化复合粉末制备技术,以蔗糖为碳的前驱体,制备了等离子熔覆Fe-Cr-C-W-Ni复合粉末;采用优化的等离子熔覆工艺,用该粉末在调质C级钢(碳含量≤0.35%)表面制备了高铬铁基金属陶瓷复合涂层。应用EDS、SEM、XRD等研究了涂层及氧化膜的成分和组织结构。在900℃恒温氧化50h的试验条件下测试了涂层的抗氧化性。结果表明:涂层以(Cr,F_e)7C_3/γ共晶为基体,其上分布大量的原位生成初生相(Cr,F_e)_7C_3,且涂层与调质C级钢基体形成良好的冶金结合。涂层氧化动力学曲线符合抛物线规律。
The sucrose was used as a carbonaceous precursor to prepare composite powders of Fe-Cr-C-W-Ni by the precursor carbonization-composition process.And the powders were used to form a high-chromium iron-base coating on the surface of hardened and tempered grade C steel (C%(?)0.35%) with the optimum plasma cladding process parameter.SEM,XRD and EDS were employed to study compositions and microstructure of the coating and oxide scales.The oxidation resistance of the ceramal composite coating was investigated under the testing condition of 900℃for 50 hours.The results indicate that the coating consists of a lot of the primary reinforcing phase of (Cr,Fe)_7C_3 which distributes on the matrix of (Cr,Fe)_7Ca/γeutectic and has a metallurgical bond with hardened and tempered grade C steel base.The oxidation kinetics of the coating is conforming to the parabolic-rate law equation at the testing condition.
出处
《金属热处理》
CAS
CSCD
北大核心
2007年第z1期430-433,共4页
Heat Treatment of Metals
基金
山东省自然科学基金(Y2002F12)
科技部科技型中小企业技术创新基金(02C26213700377)
关键词
等离子熔覆
高铬铁基复合涂层
前驱体
显微组织
抗氧化性
plasma cladding
high-chromium iron-base composite coating
precursor
microstructure
oxidation resistance
