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等离子体喷涂技术在面向等离子体材料钨涂层的制备中占据主导地位,本实验采用CuMo/MoW作为涂层的中间过渡层,分别以结晶钨粉和羰基钨粉为原料,用大气等离子体喷涂技术在CuCrZr合金基体(110mm×130mm)上制备了3～4mm厚的3种钨涂层。对钨涂层微观组织、力学性能和热学性能研究表明,羰基钨粉制备的钨涂层的综合性能优于结晶钨粉,且薄涂层的结合强度优于厚涂层。优化喷涂工艺后,金相法测得钨涂层孔隙率<2%,涂层的结合强度最大值为10MPa,EDS测得氧含量为6%左右,纯钨层热导率最大值为12.52W/(m·K),涂层氧含量过高导致涂层热导率显著降低。研究表明采用大气等离子体喷涂技术在铜合金上制备3～4mm厚的钨涂层是可行的,该技术可为下一步低成本、高性能厚钨涂层的制备奠定基础。
Plasma spraying technology is dominant in the preparation of tungsten coatings for plasma materials. In this experiment, CuMo / MoW was used as the intermediate transition layer of the coating. Crystalline tungsten powder and tungsten carbonyl powder were used as raw materials, respectively, and sprayed by atmospheric plasma Three 3 to 4 mm thick tungsten coatings were prepared on a CuCrZr alloy substrate (110 mm × 130 mm). The study on the microstructure, mechanical properties and thermal properties of tungsten coatings shows that the comprehensive performance of the tungsten coatings prepared from the carbonyl tungsten powders is better than that of the crystalline tungsten powders, and the bonding strength of the thin coatings is better than the thick coatings. After optimizing the spraying process, the porosity of the tungsten coating is less than 2%, the maximum bonding strength of the coating is 10MPa, the oxygen content is about 6% by EDS, the maximum thermal conductivity of the pure tungsten layer is 12.52W / ( m · K), the coating oxygen content is too high lead to the coating thermal conductivity decreased significantly. The research shows that it is feasible to prepare 3 ~ 4mm thick tungsten coating on copper alloy by atmospheric plasma spray technique, which can lay the foundation for the next step of preparation of low-cost, high-performance thick tungsten coating.