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n46/n6 Vol.46No.62010 6)n761—768|ACTAMETALLURGICASINICAJun.2010pp.761–768 $v TiN–Ti5Si3 zÆ} &#∗)’’1,2,3)*+(1)1) !L=L Yj0℄8j urj(, !2100162)Fraunhofer–Institutf¨urLasertechnikILT,AachenD–52074,Germany3)Lehrstuhlf¨urLasertechnikLLT,Rheinisch–Westf¨alischeTechnischeHochschule(RWTH)Aachen,AachenD–52074,Germany! N ’ %xO \Si3N4–Ti(z 1 9) l Q |,Si3N4NTi 1 REU1T 20nm,AV ^g*m9\Z, H9Ti+Si3N4=4TiN+Ti5Si3 MTiN1 Ti5Si3f#- Q1^.p%xV~,Si3N4–Ti Q |6R?\ %qj1{,mZgTiN–Ti5Si3 Q1^Jn}:1H97.2%,ZmDRTiN1 J\jL F b→ %\→? bg^. |TiN–Ti5Si3 Q1^,g*m9\,E’mD% TG14,TG665 x A w 0412−1961(2010)06−0761−08MICROSTRUCTURESOFINSITUTiN–Ti5Si3COMPOS-ITESPREPAREDBYSELECTIVELASERMELTINGGUDongdong1,2,3),SHENYifu1)1)CollegeofMaterialsScienceandTechnology,NanjingUniversityofAeronauticsandAstronautics,Nanjing2100162)Fraunhofer–Institutf¨urLasertechnikILT,AachenD–52074,Germany3)Lehrstuhlf¨urLasertechnikLLT,Rheinisch–Westf¨alischeTechnischeHochschule(RWTH)Aachen,AachenD–52074,GermanyCorrespondent:GUDongdong,associateprofessor,Tel:(025)52112626,E-mail:dongdonggu@nuaa.edu.cnSupportedbyAlexandervonHumboldtFoundationandNaturalScienceFoundationofJiangsuProvince(No.BK2009374)Manuscriptreceived2009–10–19,inrevisedform2010–03–11ABSTRACTTheselectivelasermelting(SLM)wasusedtoprocessthehigh–energyballmilledSi3N4–Ti(moleratioof1 9)nanocompositepowderinwhichtheaveragegrainsizesofSi3N4andTiwerebothlessthan20nm.TheTiNreinforcedTi5Si3matrixinsitucompositeswerepreparedbymeansofthesynthesisreaction9Ti+Si3N4=4TiN+Ti5Si3.Asthemillingtimeincreased,theaverageparticlesizeofthemilledSi3N4–Ticompositepowderdecreasedandtheresultantspecificsurfaceareaincreased.ThedensificationleveloflaserprocessedTiN–Ti5Si3compositesincreasedaccordinglyto97.2%.ThemorphologiesofTiNreinforcingphaseinthecorrespondingSLMprocessedstructuresexperiencedasuccessivechangefromapoly–angularshapetoanear–sphericalshapeandfinallytoadendriticshape.KEYWORDSTiN–Ti5Si3composites,selectivelasermelting,microstructureD℄7Ti5Si3, (:q(2403K) lo~(4.63g/cm3) YMh5v℄‘q(13v‘j q, %r) 42_ 1573K Dh/r^%.N!, skO3k2 l,Ti5Si3 % s X ! *ET f N N ~Ph19kf N BK2009374f\iaG)7 :2009–10–19,iaa)7 :2010–03–11q: :8yy, ,1980 M, l,*‘DOI:10.3724/SP.J.1037.2009.00685OEAk_6[1].℄bTi5Si3R‘ Z(e1 a4‘ )2.1MPa·m1/2),;1~O(1~6,5(,k BÆ .) Du/q, IÆ2KP Ti5Si3g R2_ f) V ’.TiN, (:q(3203K) ( ~(18—21GPa)q‘sjg ‘,( Ti5Si3(1℄lK,#Z;3 7=wo)K (TiN)9.4×10−6/ ,Ti5Si3)9.7×10−6/ ),6;r)Ti5Si3 JLh2K[2]. Ti5Si3g R2_ 3 K }z / P 762 o i n46/ , Ti5Si3 2K }F bR,3 3njE / A[.℄ H\n }&r ;T.v℄w,6E A[2_h J ‘℄A)VK,‘K2_.(1 ^%S~r.B ,P HP (1 [3]. IP/ ICS2_ = /℄l P $. R2_(insitucomposite),0; V Du4 . r,$. R2_F( 42* SU,#g –2K r$ K‘M;d r,$.2K.g S33v‘, ;F[Æ( R2_(1‘ [4].h+nA:℄(selectivelasermelting,SLM)r)W 3hA A[(rapidmanufacturing,RM)vs, -* hx i ℄Ix(computeraideddesign,CAD)v[,O ( [nAvY6:℄J }A h 2_,P kA[5 ℄h*/ ;#2_q/ ℄, OA[Ko~;( 95%,A[ ;F hjYy/}Z y’[5−8].SLM/ q R Mq R2_2, ‘, ’b R$\ }℄lA q K[hIx,O SLM/ %de K / P h(Ko~ ℄ +#nE| h$. R2_ [9,10]. ==N,SLM℄Ah{ nA:DSHq =‘ +h℄lz O7Jz IC, K℄l ,3[ Q[q{[h WKnj[11],6 ‘ $.2KN= ℄qF(nEht/AC .d r,SLMA[/ 2_K KA,$\ ‘(7S℄k S~q - &rkj) nAA[ hF(nEq‘ Wy M. 2O SLM/ |/#( &yP hSi3N4–Ti R }, d,TiN–Ti5Si3$. R2_ .o(, &y4wBP h R }SLMA[ h7K F(nEq℄lA , ( nAv{ Bsr B$.2Kh℄AiPq s#Cf.1 ~Yt2_ D2Vn :L~99.9%hTi }OL~99.0%hSi3N4 }. 2Vn } 8Q[ 75.45 24.55( { )9 1)?[,(M dFFritsch2{Pulverisette6\_Y℄( &yiS _&y,3 Ar X,,b%&r)&y Q,&_ )10 1,_ )350r/min,Iv4n&yW )2,4,8O16h.)p&y 1~O(,3 &y20min H010minh ℄ _.SLMA[= Zy D:Rofin–SinarAXeXeCO2(λ=10.6μm)nA,oZnI0g5kW,0go~BGauss -,#0gXe;t;i{ ‘M q / Phx i= .A[ICS, ‘M.A[&gÆD2* U~)50μmh 6,nAvY_Bs 6~ +, ℄A h +y Q * r; WA[&B v-I, ‘M-O1 ,( } ,nAvzeBs 6;=NY6u|,FIFV)30mm×10mm×6mmhhx|/ .nAA[Yt.Ar XB _,Ar I nU)3×103Pa,A[= O2K[l 10mg/L.#Yt ℄hnAA[/ 4w):A F’0.3mm,nA0g900W,Bs g0.10m/s,Bs -0.15mm.O Archimedesvf5 nAA[hxKo~.O ASAP2010 &rk 9 5v&yW h &rk.O BrukerD8Advance[XGIrG (XRD,CuKα,sn)40kV,se)40mA) 9 q nAA[hxh7K.O FEITecnaiG220S–TWIN[ Gs&(TEM)&= /S 4. Khx#!* Xyq AW X, Xwh K10mLHF+30mLHNO3+70mLH2Oh;~, XW 45s.O Quanta200[Bss&(SEM,| sn)20kV)OAlF(&(OM)7 ℄kq KhxF(nE.O SEM![hXGI [AG (EDX) 9hx℄lA .2 1)$\TiOSi3N4 }SEMP.; ,Ti 1#[TiNSi3N4 |SEMOFig.1SEMimagesofas–receivedTi(a)andSi3N4(b)powdersn6 7xxi:f)l?8[N ,TiN–Ti5Si3 P0℄fD&lC763 }B,C0, 2S~30μm( 1a);Si3N4 }) d, 2S~4μm( 1b). 2)H\bR }O&y16hW R }hXRD .; ,$\ }hrG TiOSi3N4ZK,Ns)&y hg 7K.&y16hW R }S6G 5ITiqSi3N4ZK,6; &yICS2030405060708090Intensity,a.u.2,degOriginalpowdermixture16hTiSi3N4 2G[aQ |p%x16hV Q |gXRD Fig.2XRDspectraoforiginalpowdermixtureand16hballmilledcompositepowder6WK9N.℄ G, }#( &yW,TirG uFB℄,rG~ B .#Scherrer2℄x ,&y16hWTi 2SFV I18.6nm, Si3N4 2SFV I13.2nm. 3), &yW Bdeh R }r[℄k, }h 2S~O &rk 4.; ,#2h&yW, B \ G hQZ7S( 1), R }7S&rG F#H.℄, 2S~ I16μm( 3a).^&yW 2I4h, R }7S(+ze℄, 2S~ Q℄I24μm;#7S&r.y&aer B( AZ,&uSi3N4 M7S R Tig B ( 3b).zeq=&yW I8h,QZh R }7S N ,℄AUFV7S, 2S~ I15μm( 3c).^&yW )16hW, R }F[℄,℄AjX(7S, 2S~Z I3μm,# S~ -2*( 3d).&yW )2,4O8hW, R } &rk#℄,Z,2U 0.5m2/g;&y16hW, R } &rkZ 2I1.53m2