【作者】 彭坤；

【导师】 王飚；

【作者基本信息】 昆明理工大学 ， 材料加工工程， 2002， 硕士

【摘要】 本文介绍了用等离子喷涂制取Al₂O₃-M硬面陶瓷复材所采用的方法及过程。通过采用多种涂层设计、增加添加剂、喷后热处理、喷后激光重熔等方法采改善Al₂O₃硬面陶瓷涂层结合强度与性能。并利用X射线衍射、扫描电镜、大型金相显微镜等技术以及一些性能测试手段对喷涂Al₂O₃-M硬面陶瓷的相结构、相组成及其性能进行了研究。 通过仿真磷化工工况，实验结果显示经激光重熔后的Al₂O₃／Ni陶瓷涂层表现出较好的抗腐蚀、抗磨蚀性能。这是因为以α-Al₂O₃为原始粉末经等离子喷涂后形成的陶瓷涂层主要以亚稳相γ-Al₂O₃存在，同时存在部分稳定相α-Al₂O₃，涂层经激光重熔后，成为组织较均匀的结构。涂层中γ-Al₂O₃发生相变成为α-Al₂O₃。添加剂Ni明显提高Al₂O₃／Ni及与基材间的结合强度，这是由于两者的熔点相差较大，在Al₂O₃凝固之后Ni保持一段时间后才凝固，显示出明显的“液相烧结”作用，提高陶瓷涂层的结合强度；在冷却过程中，涂层内的金属元素Ni以液态填充到孔隙处，起到“自封孔”的作用，有效地降低了气孔率，从而提高涂层的抗腐蚀、抗磨蚀性能。 激光重熔使组分发生相变，且大大降低涂层中的气孔率、提高致密度、硬度提高，从而提高熔化层的质量。陶瓷涂层硬度虽取决于陶瓷成分本身性质，但合理涂层设计、加工工艺及激光重熔能较大提高陶瓷涂层硬度。喷涂后立即进行热处理，涂层不易脱落，具有较好的效果。更多还原

【Abstract】 The plasma spaced Al-M hard faced ceramic coatings has been introduced in UBS papa: liasgudyappfeddesignof designof thecoatings additiveand laser rernelting treatment to improve the bond strath and properties of a serais of Al-M hand faced ceramic coating This investigation deals systematically with the phase structure, phase composition and its tissue characters and properties have been investigated by X-ray dffiactioiK scanning eledronmiaoscopyarrilarge The Al-Ni ceramic coating shoved good to wear and corrosive resistance underthe artificial condition m phosphoric chamkal industry.This is caused with phase transformation after laser remertrngThe original powder which is mainmadeof a-A1203 has been turned into metasfable Y -Alft and few a -AyO after sprayingThe coatings have been transfbrmated to uniformity microstnxturejarria of the phase y-AO, has been turned i a -A It is obvious that the tending strength between the coatings and te substrate, has beenin rovedgteattydijetolheadditrveNi becausethernehrng point of AljO ismore than thatofNi After the sobdify of A1A the Mbegan to sobdify .The addrtiw Mean produce an obvious effect of liquid phase smtering",which is beneifk toin rowlrKbcndirg strength of tne coatir CXflir the sdidifying ,the addrtiw Ni corne i the A12O3 ceramicwrththe static ofUquid,whieh can improve the properties of wear and corrosive resistance.Laser remerting treatment is due to phase transfbmiationjand reduce porosity improve the compaction and the hardness,whieh nnprove the properties of the meted coatings. The hardness of the coatings mamlylavson t he properties of the ceramk and it can be improved greatly by proper design of coatir the processing technology and laser remelting treatment If the coatings have been heat- treating after spray or laser rerndt -treating, the coatings will have better properties.更多还原