| 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.
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