Nghiên cứu đặc tính lớp phủ hợp kim 67ni18cr5si4b trên nền thép c45 bằng công nghệ phun phủ HVOF

NGHIEN CUTU - TRAO oOl NGHIEN CLTU DAC T I N H L Q P P H O B O T HOP KIWI 67NI18CR5SI4B TREN N^N TH^P C45 BANG CONG NGHE PHUN PHU HVOF A RESARCH ON THE CHARACTERISTICS OF 67NI18CR5SI4B ALLOY POWDER COATING ON C45 STEEL WITH HIGH VELOCITY OXYGEN FUEL THERMAL SPRAY METHOD (HVOF) ThS Pham Van Li^u', PGS,TS Dinh Van Chien^ 'Trudng Dai hgc Sao Dd ^Trudng Dai hgc Md - Dia chdt TOM TAT Cong nghe phun phu HVOF Id cong nghe mdi, tien tiin tren the gi&i Mac du dugc phdt trien tie nhimg ndm 1980 nhung cong nghe phun HVOF dugc ung dung rgng rai vd da dgng tren nhieu linh vuc cd nhieu uu diem O Viet Nam, cong nghe phun phu HVOF rdt mai, chua dugc dp dung nhieu Trong bdi bdo ndy, nhdm tdc gid trinh bdy kit qud nghien citu cung, xop vd bdm dinh lap phu, ddng thdi ddnh gid chdt lirgng lap phu bgt hgp kim 67Nil8Cr5Si4B tren nen thep C45 bang cong nghe phun HVOF Tir khoa: Phun phit, HVOF, lap phu, bgt phun 67Nil8Cr5Si4B, cimg bdm dinh ABSTRACT HVOF spraying technology is an advanced new technology in the world Although this technology has developed since 1980, it has been widely applied in diverse fields because of its numerous advantages In Vietnam HVOF spraying technology undeniably remains fairly new and has not had a wide range of applications In this study, a group of writers will present the results of the coating's hardness, porosity and adhesion and evaluate the quality of67Nil8Cr5Si4B alloy powder coating on C45 steel with high velocity oxygen fuel thermal spray method (HVOF) Keywords: Sprer^, HVOF, coating, 67NiISCr5Si4B alloy powder, hardness, adhesion ISSN 0866 - 7056 TAP CHl CO KHl V I £ T NAM, Sd 12 ndm 2015 www.cokhivietnam.vn NGHIEN CUrU-TRAOeOl 1.DAT VAN DE keo, nen MTS 809 (hmh 4) Cdng nghe xu ly bd mat cang dugc quan tam, nd cd y nghia quan trgng va quyet dinh nhieu den tinh chdt va tudi ben ldp be mat vat ligu Mdt nhung giai phap dd la irng dung cong nghe phun phu HVOF de tao mdt ldp be mat cd khd nang dap iing dilu kien lam vice ciia cac chi tiet may cd cac yeu cau dac biet ve be mat nhu: Chiu mai mdn, chiu nhiet, chiu va dap va cac thugc tinh khac Uu diem chinh ciia cdng nghe phun phii HVOF la tao ldp phii cd Cling, bam dinh cao [1,2] Ddng thdi, khdng gay iing sudt nhiet ldn nhu han ddp [3] De danh gia dugc dac tinh ldp phii cdn phai thuc nghiem tren co sd cdc thdng sd V, m va L Tir ly dd, nhdm tac gia dd tiSn hdnh nghien euu thyc nghiem Ket qud nghien cim dnh hudng cua cac thdng sd cdng ngh$ V, m va L den Cling, xop va bam dinh ldp phii bgt hgp kim 67Nil8Cr5Si4B fren nin thep C45 bdng phuong phap phun nhiet HVOF dugc trinh bay bai bao 2.2 Phugng phap nghien cihi N O I D U N G NGHIEN ClTU Tren ca sd ly thuyet phun phu vd thyc nghiem, tien hanh phun tr6n 27 mdu thi nghiem theo che quy hoach thyc nghidm (QHTN) vdi cac thdng so chinh nhu sau: Khoang each phun L = 100 -^ 300mm, luu lugng cap bdt phun m = 300 -^ 500 g/ph Tdc trung binh ddng kim loai phun V = 800 -^ 1200m/s, chilu day ldp phu 0,6mm, dd gid mdu thir bam dinh dugc thiet ke che t^o chuyen dung ^ Hinh Thik biphun HVOF tm 2.1 Vat lifu, thiet hi thyc nghifm Vat lieu ndn la thep C45, ca tinh cua vdt li6u dugc ldy theo TCVN 8301: 2009 [4] Mdu thi nghiem cd dudng kinh D - 60 mm, chieu dai mdu L = 20 mm Sd lugng mdu dugc thyc hiSn nghien euu la 27 mau Vdt lieu phu dugc sir dung nghien ciiu la bdt hgp kim 67Nil5Cr5Si4B (ky hieu theo tieu chudn nganh cuaNgala67H18X5C4P) Thilt hi thi nghiem dugc sii dung qua trinh phun la he thdng phun HVOF- Model MP-2100 Manual HVOF Control Panel, ciia hang General Metal Alloys Intl ciia Bi (hinh 1) Sau phim xdp dugc kiem tra tren kinh hiln vi Axiover 25A (hmh 2), ciing lap phu dugc tren thilt hi do ciing te vi Duramin (hmh 3), bdm dinh dugc kilm tra tren may Hinh Thiit biphun HVOF Hinh Thiet bi do cimg te vi Duramin Hinh Thiet bi keo, nen MTS 809 ISSN 0866 - 7056 TAP CHl CO KHl VIET NAM, Sd 12 nam 2015 www.cokliivietnam.vn NGHltN CUU - TRAO Ddi 2.3 Kit qua v^ binh luSn 2.3.1 Kit qud dp Cling l&p phU Qua trinh do ciing dupc thuc hien theo thii tu tir mat ngom ldp phu hot hop kim Ni67Crl 8Si5B4 (phia phai) vao loi thep C45 (phia trai), km qui duoc cho bang 1, vdi tai trpng duac cai dat la 1(N), cho thiy cac vit in co kich thuoc tang din tit phin lop phu sang phin 18i thep nhu hinh anh ciu tnic \i vi tuong ling voi cac miu khao sat s6 02 va miu so theo quy hoach thuc nghiem (hinh 5) Ttr cac s6 lieu bang cho thiy: Dp Cling lop phu dat gia tri khoang hom 500 HV Cao hon khoang lin so voi dp ciing ldp n6n thep C45 va co gia tri giam dan theo hucmg kinh Hinh chup anh ciu tnic tS vi vung lien kSt giua lop nSn thep C45 va lop phu bpt hpp kim 67Nil 8Cr5Si4B cho thiy lop phu nhan dupc tren cac mlu thi nghiem diSn hinh co dp min, ty le tap chit it ben lop phu It, diSu chiing to lop phii co chit lupng cao Uiaup BUngl/n mpphC IMIhip a) Mdu sS 02, xJOi BOngHI Upphi b/i4Su8 xlOO Hinh Anh chup cdu true te vi vitng lien ket lap giira nen thep C45 vd lap phu bdt hap kim 67Nil8Cr5Si4B Bdng I Do Cling l&p phu hot hap kim 67Nil8Cr5Si4B tren nen thep C45: Ky TT llKD D i cnng theo tbvtvvet (HV) Ldrp nen fliep C45 Ldp tmng gian Ldrpphn man 000 010 020 100 201; 181; 192 (Trung binh: 191.3) 223;234;262 (Trung binh: 201.0) 198; 195;209 (Trung binh: 200.7) 277; 211;187;217 (Trung binh: 223.0) 372;287;281 (Trung binh: 313.3) 249; 343; 466 (Trung bmh: 324.7) 338; 387; 265 (Trung binh: 330.0) 340; 269; 410 (Trung binh: 339.7) ISSN 0866 - 7056 TAP CHi CO KHf VIET NAM, Sd 12 nam 2015 www.cokhivietnam.vn 530;375;598; 599; 431 (Trung binh: 506.6) 592; 663; 545; 604;697 (Trung binh: 504.4) 380;392;452;601;594 (Trung binh: 483.8) 545; 570; 589; 616; (Trung binh: 580) NGHIEN CUfU - TRAO Q | g 110 120 200 210 220 2 ; ; 188; 0 ; 287; ; 556; 8 ; (Trung binh: ) (Trang binh: 334.3) (Trang binh: 547.7) 5 ; 542; 573; 606 223;255;161;233 7 ; ; 357 fTrnng binh: ) (Trang binh: 352.3) (Trang binh: 568) ; ; 0 ; 198 506;214;533 4 ; 614; ; 628 (Trung binh: 229.0) (Trung binh: 417.7) (Trung binh: 569.2) 267; 196; 1 ; 185 527;282;473 464; 1 ; ; (Tnmg binh: 214.8) (Trang binh: 427.3) (Trung binh: 568.7) ; 2 ; 2 ; 208 ; 467; 542 456; 605; ; 623 (Trang binh: 2 ) (Trang binh: 421.0) (Trungbinh: 563.7) Phan tich ket qud thi nghiem tren hmh cho thdy: 1) Tren mdu thi nghiem so 02 (hinh 5a) vimg hien gidi giiia lop, nSn thep C45 va ldp phu hot hgp kim 67Nil8Cr5Si4B, tren toan bg chieu dai man khdo sat cd mdu sdng, vd it tap chdt, dieu dd chung td rang lop phii cd ham dinh tdt Cdc vet dn cua ddu nhan dugc 216p vat heu khao sat cd kich thudc hinh hgc khac nhau, cu the la: Kich thudc cac vet dn lop phii hgp kim cd gid tri nhd hon kich thudc vet dn nen thep C45, dieu dd chiing td rdng ciing cua ldp phii hgp kim ldn hon ciing cua nen thep 2) O mdu thi nghiem sd (hmh 5b, 5c, 5d), cho thdy bien gidi lop nen thep C45 va ldp phu hot hgp kim 67Nil8Cr5Si4B tren toan hg chieu ddi mdu khao sat cd mdu sang, va it tap chdt, dieu chiing td rang ldp phii cd hen ham dinh rat tdt Khi do ciing cua lop vdt lieu tren man thi nghiem sd 08 ciing tuong tu nhu mau thi nghiem sd 02 cho thay kich thudc vet an ldp nen thep ldn hon kich thudc vet dn lop phu hgp kim, dieu dd chiing td ciing ldp phii hgp kim ldn hon ciing ldp nen thep 2.3.2 Ket qud ^ xop vd ^ bdm dinh ldp phu: bang 2: Bang Kit qud do xop vd bdm dinh cua ldp phu trin cdc mdu thi nghiem: Toe 06 Lo dong XT Ma fhi kU nghiem V (m/s) 000 Lothi 800 010 nghiem 800 020 thiil 800 Lim iDffng phnn m (S/pk) 300 300 300 Khoang Bo xop ldp lien Ung snat bam dmh kk each phnnL TIN TQH Sai so OTN