火焰噴涂wcni硬質(zhì)涂層的燒結(jié)強(qiáng)化

1、國內(nèi)圖書分類號(hào)：TFl24國際圖書分類號(hào)：669工學(xué)碩士學(xué)位論文火焰噴涂WC—Ni硬質(zhì)涂層的燒結(jié)強(qiáng)化碩士研究生：導(dǎo)師：申請學(xué)位：學(xué)科、專業(yè)：所在單位：答辯日期：授予學(xué)位單位：王旭丹宋申華教授，嚴(yán)高林副教授工學(xué)碩士材料學(xué)深圳研究生院2005年12月哈爾濱工業(yè)大學(xué)AbstractInengineeringpmctice，wearingresultsin孕eatd鋤ageformaterialsurfacesHotsprayisanimpOn

2、antsl】rfaceprocessingtedhniquea11dmematerialsurfacecanbeenhancedandrepairedtlllouP血coatingAtthes啪etime。thehotspraycanalsogivemematerialsu血ceaspecial^mctionConsequently，ithasbeenextensiVelyusedinen百neeringapplicationsThep

3、res髓tworkappliesmecraftofn鋤espraytomeWCNistereoplasmco砒ingonO45CsteelbodyThecoatingissinteredunderanargonannospheretostrengtheIlthecoatin窯Thecoating仃Batedaboveischaractcrizedusingsc刪ngelectronmicroscopy(SEM)equippedwiman

4、eIlergydispersivexraymicroanalyzer(EDX)，髓dmicrohardnessmeasurementsAftern鋤eremelting，alargequantityofmicrocracksaref0徹edinthecoatingbeca駐seofthefhstcoolin臣whichleadstoahi幽stfessconcentrationinthevicinityofbotllgubstr曲pco

5、砒ingandWCcoatinginterf如esInaddition，thedistribution0fmi啪hardnessacrossmecOatingisconsiderablyinhomogeneous，leadingtoaVerylarge95％confidenceintenralTMswouldbedeleterioustothewearperfom姐ceSinteringllnderargonprotcctioncana

6、pparennyimprovetlleperfbmaIlceofthenamcsprayedcoatingBecauseoftheprotectionofargon，theactiveelementswitllinmeWCNicoating’8uchasNiandCfareavoided￡∞mcontactingmeoxygenandint11m行ombeingoxidizedSimeringcanovercomet11edisadva

7、lltageofnamer鋤eltingItc蚰avoidcrackscausedbyfastcoolingandreiIuceotherdefbctssuchasvoidsAtmesametimetllemicroshllctIlreinthecoatingsinteredisunifom，leadingtoaunifo衄distributionofmicrohardnessvaluesacrossmecoatingAnersinte

8、ringat1050℃for15h，themicfohardnessofthec08tingincr髓∞sby583％asc伽唏afedwi如thatofthenameremeltedcoatingandh鷦av盯ysmall95％confidcnceintcrval，whichcouldimproVemewe鼬ilityoftllecoatingtoa霉電atde掣eeKeywordsfl鋤espray，argonprotection