材料科学与工程专业英语06-unit 08课件.ppt

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1、材料科学与工程专业英语SpecialEnglishforMaterialsScienceandEngineeringUnit8SuperalloyUint8SuperalloycoatingofsuperalloysProductsfromsuperalloys,whicharesubjectedtohighworkingtemperaturesandcorrosiveatmosphere(likefirststagesofturbinebladesofthejetengines)arecoatedwithvariouskindsofcoatings.Mai

2、nly,twokindsofcoatingprocessesareapplied:packcementationprocessandgasphasecoating.BothofthemareCVDcoatings.Inmostcases,afterthecoatingprocess,near-surfaceregionsofpartsareenrichedwithaluminum,thematrixofthecoatingisnickelaluminide.Besubjectedto受到…；经受…Corrosive英[kə'rəʊsɪv]美[kə'rosɪv

3、]adj.腐蚀的；侵蚀性的n.腐蚀物firststage第一阶段的；第一级的；第一期的turbine英['tɜːbaɪn;-ɪn]美['tɝbaɪn]n.[动力]涡轮；[动力]涡轮机jetengine[航]喷射发动机（等于jet，jetmotor）becoatedwith用…包上；表面覆盖有…；表面镀…coatingprocess涂层工艺，涂层方法apply实施，应用CVDcoating化学气相镀膜near-surface近地表regionsn.地区；地域；领域（region的复数）beenrichedwith丰富了matrix英['meɪtrɪks]美['

4、metrɪks]n.[数]矩阵；模型nickel英['nɪk(ə)l]美['nɪkl]n.镍aluminide[ə'lju:minaid]n.铝化合物nickelaluminide铝化镍翻译：超耐热合金涂料超耐高温合金的产品经受得住高的工作温度和腐蚀性环境（像喷气式发动机的涡轮机叶片的第一阶段），其表面覆盖着各种各样的涂料。大体上，有两种涂层工艺得到了应用：包埋工艺和气相涂层。这两者都属于化学气相镀膜。在大多数情况下，涂层工艺结束之后，靠近铝表面区域的部分被丰富了，最终得到的涂层模型是铝化镍。PackcementationprocessThepackceme

5、ntationprocessiscarriedoutatlowertemperatures(about750℃(Celsiusdegree)).Thepartsareloadedintoboxes,whichcontainamixtureofpowders:activecoatingmaterial,containingaluminum,activator(chlorineorfluoride)andthermalballast,likealuminumoxide.Athightemperaturesthegaseousaluminumchlorine(or

6、fluoride)istransferredtothesurfaceofpartanddiffusesinside(mostly,inwarddiffusion).Aftertheendoftheprocesstheso-called“greencoating”isproduced,whichistoothinandbrittlefordirectuse.Asubsequentdiffusionheattreatment(severalhoursattemperaturesabout1080℃)leadstothefurtherinwarddiffusion

7、andformationofthedesiredcoating.cementation英[,siːmen'teɪʃ(ə)n]美[,simɛn'teʃən]n.黏固(作用)becarriedout进行;被执行;实现beloadedinto装进;被加载到powdersn.粉末；散剂（powder的复数）coatingmaterial[涂料]涂料；涂层材料；饰面材料；覆盖材料aluminum英[ə'ljuːmɪnəm]美[ə'lʊmɪnəm]n.铝activator英['æktɪveɪtə]美['æktə,vetɚ]n.催化剂；[助剂]活化剂；[助剂]激活剂；触媒

8、剂chlorine英['klɔːriːn]美['kl