GHI eN cufu-TRAO & Nghien cufu anh hufo^ng cua c a c thong so tdi cufng tc vi cua ldp ma to htfp composite Ni - AlgOg A study of influence of factors on hardness of Ni - AI2O3 composite coatings Ly Viet Anh, Vu Thi Liln, Phan Quang The Trudng Dai hpc Ky thuat Cdng nghiep - Dai hpc Thai Nguyin TOM TAT Bdi bdo ndy nhdm nghien cuu dnh hirdng cua cdc yeu to quan co the dieu khien duac den cung te vi cua Icyp mg to hcrp composite Ni - Al^O^ Ke hoach thie nghiem vai ba muc cua ba thong so toe khudy, mat dong dien vd nhiet ciia dung dich dien phdn da duac thiet lap theo ky thudt f r X r ciia Taguchi vd ket qud thu dugc dugc xir ly bdng cdch phdn tich ANOVA Ket qud thu dugc cho thdy Cling te vi cua lap mg Ni — Al^O^ chiu dnh huang nhieu nhdt bai hai yeu to Id: toe khudy, mat ddng dien, nhiet dnh huang khong nhieu Su tuang tdc giUa ede yeu to dnh huang Id khong ddng ke den cimg te vi cua lap mg Mot bo thong so toi uu dugc ehi tie nghien cuu ndy CO the ldm tdng cimg te vi eua Icyp mg to hgp composite Ni -Al,0^ len tai gdn ldn so vdi mg Ni dan chdt thong thuang ABSTRACT Thispaper aims to study influence of controllable factors on hardness ofNi-Aip^ composite coatings The experimental plan was set on Taguchi's techniques with three levels of three parameters: stirring speed, current density and temperature of electrolyte Then, the obtained results was treated by the analysis of variance (ANOVA) The resuh shows that stirring speed and current density are two significant factors which impact the most on the hardness of Ni-Aip^ composite coatings while temperature is not much affected This research also gives a set of optimal values of these factors and it can increase two times of the hardness of Ni-Aip^ composite coatings when comparing with Ni coatings TAP CHf CO KHf VIET NAM *•• Sd 10 (Thang 10 nam 2011) NGHIEN ClJfU - TRAO D(!)l GIOI TH I EU deu dupc nang cao la sy tdn tai cua Al^O^ Matric Ni Dp cung te vi ciia ldp ma cd the tang Ma composite nham lao ldp ma Iron tdi lan so vdi ma Ni thdng thudng, dp cung nen kim loai, hop kim dial dco I.dp ma composite li Ic thuan vdi mat dp Al () ldp ma va ti le tren nen Ni co ca tinh dac bill nham lang kha nghich vdi kich thudc cua hat cung, gidi han ben nang lam vice ciia chi till may dicu kipn va gidi han ben keo tang len lan, tang mat mdn va an mdn Ma composite ddng vai Ird quan dp Al,()^ ldp ma kha nang chdng mdn cua trpng ky thuat - dap iing dirpc cac yeu cau lie mat dupc nang cao Gidi han chdy ciia ldp ma cua cdng nghe cao dpng co may bay, dpng Ni giam manh nhiet dp tang den 200"F CO tua bin hicn dai cdng nghiep d to, vu try va cac ldp ma Ni- Al^O^ gidi han chay hau nhu hat nhdn khdng thay ddi den nhiet dp 800"F [5,6] Nhu vay mpt quy hoach thflc nghiem da dupc thilt lap dc Qud trinh ma composite don gian, kinh ic nghien cuu anh hudng cua ba thdng so: tdc dp \a ldp ma \di cac tinh chat mong mudn cd the khuay, nhiet dp dung dich dien phan, mat dp ddng hinh tren bat cu kim loai \a hpp kim nao dicn den dp cung le vi Dong thdi bdng phuang nham thay ddi tinh chat be mdt cua chiing Ma phap hoi quy thuc nghiem mdt bd thdng sd tdi uu composite len tren be mat chi tilt may vdi su da dupc chi cd thi tang dp eung tl vi tdi gdn tham gia ciia kim loai va cac hat trung tinh nham lan giam ma sat, tang kha nang chdng mdn hoac dn mdn trin bl mat tilp xuc [ ] Cdc hat trung tinh, Bai vilt dupe trinh bdy gdm cdc phdn cung, nhd phdn bd cdu true eua ldp ma sau: phdn la phuang phdp va tiln trinh thue hiln tao nIn cdc tinh chdt co ly dac biet, nang cao tinh thi nghiem Ket qua vd thdo luan dupc trinh bdy d dn dinh \ e cau true d nhiet dp cao hon phSn Phan '^••'^' '">'•"" '^^ '^ '^ac kit luan, Cac thdng sd cua qua trinh ma compos ite nhu mat dp ddng dien, che dp xung, tdc khudy, nhiet dp dung djch diln phdn, dp pi! co anh hudng true tilp din cdu true va co tinh cua ldp ma composite [2] Trong nghien cuu iia\ ba thdng sd: mat dp ddng dien, to dp khudy va nliict dp dung dich diln phdn da dupe chpn de nyhicn cuu dnh hudng cua chung din dp cung tl \ i cua ldp ma Bdi vi ba thdng sd cd the dl dang dicu khien dupc bang ky thuat sd [3,4] Ma composite tren nIn Ni dupc thuc hien cdclic chcu phan mudi Niken Sulfate tieu chuan hoac Nikcn sulfamate su dung hat eung laA|20,,TiO„ ( acbii va Nitrit chju nhiet, graphit, MoS,, kim cuivng thach anh Vdi Al^O, d dang thu hinh a hoac y vdi kich thudc cd micro hoac nano tham gia \ ao ldp ma cung Ni Trong mpi trudng hpp, the lich cua AI2O3 ldp ma ti 11 thuan vdi ti le phan tram cac hat dung djch dien phan Trong mdt sd trudng hpp ti le hat cd the len tdi 200 nig/1 [8] Cac tinh chat cua ldp ma composite AlO, (cd kich thudc micron va nhd han) tren nen Ni deu cd dp cung te vi, gidi han ben, kha nang chdng mon TAP CHf CO KHf VIET NAM •t* PHI ()N(; PHAP \ A TIEN TRINH THUC HIKN I HJ NCiHIEM 2.1.1 I hict bj thi n 310 310 310 310 310 310 310 310 310 3N 40 45 35 17 18 19 20 35 40 45 35 40 45 3 5 s Sd 10 (Thang 10 nam 2011) 40 45 35 40 45 35 40 45 35 40 4i ;jj ;?3 ;4Ci 24^1 261 21; 23« 211 278 270 290 303 301 290 278 262 300 218 215 220 230 23« 2€B 220 223 214 NGHIEN ClJfU - TRAO D | Qua trinh dupc thuc hien trin 27 ldn thi Cd the de dang quan sdt thay d bang nghiem (3^), cac cdp dp cua mdi biln dupc lua ANOVA la hau nhU chi cd hai thdng sd: van tdc chpn theo cac gia trj diln hinh liln quan tdi dp khuay (73.76%) va mat dp ddng diln (10.55%) la cung tl vi cua chi tilt Mdt bang thi nghiem dupe hai thdng sd quan trpng vd dnh hUdng ldn din lap vdi 27 hang ung vdi 27 thi nghiem (26 bac dp cdng te vi Trong dd nhiet dp anh hUdng tu (3^ - 1)) va 13 cdt tuang ung vdi ba muc khdng ddng ke din kit qua Trin hinh the hiln gia trj cua bien (bang 3) Moi biln va tuong tdc dnh hudng rilng rl cua cdc biln tdi dp ciing tl ciia cac bien dupc sap xep vdo cac cdt tuong vi cung chi kit qud tUdng tU Khi gia trj cua ung theo phuang phap Taghuchi Cdt ddu tiln se van tdc khuay vd mat dp ddng diln thay ddi thi la van tdc khuay, cdt sd hai se la mat dp ddng diln gia tri dp cdng tl vi thay ddi rat nhanh va nhiet dp se nam d cdt sd Tuong tac giiia cac nhiet dp thay ddi thi dp ciing tl vi thay ddi khdng biln duoc dat vao cac cdt cdn lai nhilu KET QUA VA THAO LUAN Ddng thdi bdng ANOVA cung cho phep nghiln ciiu cdc tUdng tdc giuta cac thdng sd din kit qud thi nghilm Kit qua phdn tich d bang cung chd thay nhflng dnh hUdng la khdng ddng ke Dilu dd ciing dUdc the hiln rd trin hinh 6, hau hit cdc dUdng bieu dien cac tUdng tac gifla cdc biln dIu gan nhU song song vdi hoac lech rat it 27 thi nghiem dupc thilt kl va thuc hiln theo cac sd lieu bang Kit qud dp ciing tl vi dupc thi hiln d cdt bdng Bang ANOVA (bang 4) dupc lap cho phep phdn tich dupe anh hudng eua mdi biln tdi phuang sai toan phdn ciia kit qua, bang thi hiln rd nhdt dilu Trong nghien cuu miic dp tin cay ve anh hudng cua cac thdng sd din dp eung tl vi Id 95% Tfl nhflng phdn tich trin, mdi tUOng quan hay F(5%) Ddng thdi cdt cudi cung cua bang gifla cdc bien sd khac tdi dp cflng t l vi thu bilu diln gid trj phdn tram dnh hudng P(%) ciia dfldc bang hdi quy: mdi biln tdi phuang sai cua dp ciing tl vi Hdm hdi qui: Nlu gia trj d cdt Ftest ldn hon gid trj tuong y = 299.407 -1.6x^ - 0.4jc, 4- 5.4^3 ling d cdt F(5%) thi dieu dd cd nghia la thdng sd (1) -57.Ix,^ -23.2x; +2.7x,dd cd dnh hudng ldn vd quan trpng nhat den kit qud thi nghiem Trdng dd: x,, x^, x^ lan Iflpt la cdc ma hda Bdng 4: Bdng ANOVA cho cimg te vi cua lop mgcua V, A, T va dflpc bieu diin nhfl sau: SS D f DQM Ft^l F P(%) 15i-8." S"8S.4 38.14" A.4( "i ~i A Hinh 6: Anh hircmq ciia cdc tuang lac ('ulci cac iht/W' SI) 1(11 cirn'' Ic vi i ^ TfJCAft ////;// ': Inh SI.M nuji ( dl n^^an^ < iia /(')]> ma saii 2giif 4.KET LUAN De tdng khd ndng chdng mdn cua b l mat tiep xuc lam vile mdi trfldng an mdn, tang dp cflng te vi cua ldp b l mat Id mdt gidi phdp hflu hilu Thay ddi cdc thdng sd cua qud trinh ma nhfl tdc dp khuay, mat dp ddng diln, nhiet dp dung dich diln phdn dan d i n nhflng thay ddi dang ke vl dp cflng t l vi cua ldp ma composite Ni-Al^O^ TAP CHf CO KHf VIET NAM • Dp cflng t l vi tdi flu cua ldp ma dat dflpc= 299,47 HV vdi bp thdng sd nhfl sau: V = 220 v/p; A = 4,92 A/dm^ T = 39,8 "C • Tdi Iilu tham khao: [1] Indira Rajagopal, Composite Coatings, Surface Modification Technologie, Marcel Dekker, Inc, New York, 1989 [2] Hovestad.A, Jansen L.J.I, Electrochemical Co-deposition of Inert Particles in a Metallic Matrix, Journal of Applied Electrochemistry, Vol 25, pp 1-8; 2005 [3] P.Q The, N D Binh, T M Dflc, Anh hUdng cua cac thdng so qua trinh tdi dp cflng te vi cua ldp ma composite, Tap chi khoa hpc va cdng nghe DHTN, so 78, trang 3-7, 2011 [4] Kuo.S.L, Effect of Nickel Ion Concentration on Ni/Al203 composite coatings, Journal of Chinese Insititute of Engineers, Vol 28, No.1, pp 1-8; 2005 [5] P.Q The N.D Binh, T.M Ddc, Ma composite Ni-Al203-giai phap ky thuat nang cao kha nang chdng mdn cua ldp ma Ni, Tap chi khoa hpc va cong nghe DHTN, sd 78, trang 13-16, 2011 [61 D Fawcett, A Textbook of Histology, W.B Saunders Co., Sprieger.PA, 1986 [7] D.B Burr, R.B Martin, Structure, Function and Adaptation of Compact Bone, Raven Press, New York, 1989 [8] S Weiner, H.D Wagner, The material bone: structure-mechanical function relations, Annu Rev Mater Sci 28 (1998) 271-298 [9] P.Q The, N.D Binh, Ma sat mdn va mdi trdn ky thuat, Nha xuat ban khoa hpc va ki thuat Ha Ndi, 2006 [10] Phillip J.Ross, Taguchi techniques for quality engineering, Mc Graw-Hill, 2"M996 Sd 10 (Thang 10 nam 2011) ... cua ldp ma Bdi vi ba thdng sd cd the dl dang dicu khien dupc bang ky thuat sd [3,4] Ma composite tren nIn Ni dupc thuc hien cdclic chcu phan mudi Niken Sulfate tieu chuan hoac Nikcn sulfamate... cua Al^O^ Matric Ni Dp cung te vi ciia ldp ma cd the tang Ma composite nham lao ldp ma Iron tdi lan so vdi ma Ni thdng thudng, dp cung nen kim loai, hop kim dial dco I.dp ma composite li Ic thuan... len tdi 200 nig/1 [8] Cac tinh chat cua ldp ma composite AlO, (cd kich thudc micron va nhd han) tren nen Ni deu cd dp cung te vi, gidi han ben, kha nang chdng mon TAP CHf CO KHf VIET NAM •t*