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贺定勇1, 赵力东2,Zwick Jochen2,Bobzin Kirsten2,Lugscheider Erich2
(1.北京工业大 学材料科学与工程学院,北京 100022;2. 德国亚琛工业大学表面工程研究所,德国 亚琛D-52070)
摘要 高能球磨技
术是一种制备金属基复合材料的有效方法,采用该方法制备了Al2O3弥散强化316L不锈钢喷涂粉末,并进行高速火焰喷涂
(HVOF)试验。研究了弥散强化粉末及其喷涂层的微观组织结构和硬度。采用销I盘磨损试验机测试了涂层的耐磨性能。结果表明,球磨加工后,Al2O3颗
粒尺寸大多小于1μm,由微米级、亚微米级及纳米级粒子组成并均匀分布在316L不锈钢基体粉末中。随着球磨时间的增加,粉末的显微硬度增加。喷涂后球磨
粉的微观组织结构基本不变,喷涂层的硬度比对应球磨粉末硬度低,其耐磨性明显优于单纯不锈钢粉末涂层。
关键词 Al2O3/316L;粉
末;球磨;涂层;硬度;耐磨
高能球磨技术是一种制备金属基复合材料(MMC)的有效方法。球磨过程中,粉末粒子重复不断地经受变形、破碎和
冷焊的过程,造成粒子的机械合金化 [1-4]。对于韧K
脆材料的复合,如316L不锈钢粉与Al2O3粉,在机械合金化过程中,脆性粉末被破碎成细小颗粒后嵌入金属基体中并被其包裹,从而获得到了复合结构的粉
末。MMC 的性能取决于金属基中硬质相的数量、尺寸及分布形态。采用纳米氧化物进行弥散强化可有效地改善MMC 的力学性能[1].
全文下载Al2O3
弥散强化316L不锈钢粉末的高速火焰喷涂
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