采用等离子球化技术对不规则钨粉进行球化,以还原后的球形钨粉为原料于CuCrZr合金基体上在氮气保护下,用大气等离子喷涂制备聚变堆用厚钨梯度涂层.利用X射线衍射(XRD)对钨粉和涂层进行物相分析,采用扫描电镜(SEM)对钨粉和涂层微观形貌进行观察,使用O/N测量仪、激光热导仪和拉伸试验机分别对涂层氧含量、热导率和结合强度进行测量,用X射线光电子能谱(XPS)对钨涂层中钨元素的价态进行分析.结果表明:在氮气保护下,采用大气等离子喷涂成功制备了以Cu-Mo/Mo-W为过渡的约2mm厚钨涂层,其结合强度为15.2MPa.相对真空热处理而言,H2还原热处理能显著降低等离子球化钨粉和钨涂层的氧含量,H2处理后涂层中氧含量从0.93％(质量分数,下同)降至0.17％.在钨涂层制备过程中由于存在对流氧化和扩散氧化,导致涂层存在微量的氧化物,其中氧化物主要以WO2.72和WO3存在.
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