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NGHIEN Gl>U-TRAO D O I CONG NGHE LUY6N KIM B O T CHfi TAO P H I LOA PHUT DONG b a TEN LI>A NHIEN LIEU R A N C LdN POWDER METALLURGY FOR PRODUCING WORKPIECES OF LARGE SOLID FUEL ROCKET NOZZLE TS I^an Ngoc Thanh Vien Khoa hgc vd Cdng ngh§ Qudn su TOM TAT Bdi bdo trinh bdy nghiin cicu dp dung cong nghe luyen kim bgt di chi tgo phdi molybdeh Phdi sau ep, thieu kit dugc phdn tich td chuc vd ty Cdc kit qud dgc vdphdntichcho thdy, phdi dap ung ldm vgt lieu chi tgo loa phut ddng ca tin lua nhien lieu rdn ca lan Qui trinh cdng nghi luyen kim bdt dp dying nghien cim ndy cd thi sic dung de che tao cdc phdi dgc ch ca lan tie cdc kim logi cd nhiet ndng chay cao Ttf khda: Tin lua, cdng nghi tin lua, cdng nghe vgt lieu ABSTRACT The paper reseached aplication powder metallurgy for producing workpieces ofmolybden After impacting, sitering, samples was analyted density and microstructure Result of analytin show that the ingots can work to nozzle for large motor rocket Powder metallurgy used in this researching can aplication to make large ingot of refractory metal Keywords: Missile technology, technology of powder metal MO BAU Molybden la kim loai thude nhdm kim loai cd nhiet dd ndng chay cao 2620''C Hd sd dan nd nhiet kha thdp, ddn didn vd ddn nhidt tdt, cd ben cao Nhugc didm Id hi oxy hod manh mdi trudng dxy hoa Do ddn nhiet cao han 50% so vdi cae hgp kim thep, sat, niken 11 ] Molybden la kim loai quan trgng nganh cdng nghi%> ten liia Ddy Id vdt lieu tdt de ldm loa phut ddng ca ten lira nhien lidu rdn, eae chi tidt chiu nhiet khac nhu mep bS mat canh didu khidn, van, tdm chdn nhidt biic xa cdnh tan nhidt, cdnh tuabin [1,2] Cdng nghS iuyen kim hot la edng nghd ca ban dd che tao phdi vd chi tiet tii kim loai molybden Cdc yeu td cdng nghd edn quan tdm la: Luc ep dinh hhih, thdi gian thieu kit, thieu kdt, nhidt thidu ket O nhidt cao nhat, thdi gian thidu ket nen tri ngan nhat dd tranh Idn hat Khi thieu kdt tao mdi trudng bdo ve, tranh eho mdu hi d xy hda (khi tnmg tinh, hodn nguydn hoac chdn khdng) [2] Qua trinh thieu kdt true ti§p mau ed ddng dien chay qua (hieu iing JunLenxa) trdn eac phdi ca nhd (tru (|)10xl0 mm) duge dp tu bdt molybden xdy kha thudn Igi ISSN 0866 - 7056 TAP CHI CO KHl VIET NAM, Sd 1+2 nam 2017 www.cokhivietnam.vn NGHIEN CU'U - TRAO uOi cac mdu thdng qua mdt dng nung graphit gian tidp De khang dinh van dd edn tien hdnh nghidn eiiu nghien ciiu nham xac dinh cae ehe dd cdng nghd phu hgp Ket qud nhan dugc mdu ed khdi lugng khoang 9g, ty trgng dat dugc hi 8,5-9,7 [2] Be ehe t^o eac ddng ca nhien Ueu ran cd luc ddy ed lue ddy vira va Idn (trdn 2000N), cin ehd tao dugc ede phdi tru molybden kich thudc khdng dudi 020x30mm theo edng nghe luyen kim bdt Thidu kdt true tiep cdc mlu ndy dieo edng nghd duge thuc hien [2] Id khdng thd didu kidntiiietbi thue te hien Giai phap dd xudt Id- tien h^ih thieu ket EP VA THiiU KET B O T MOLYBDEN Bdt molybden cd kieh thudc hat dugc nhd han 3,5fim, cd kich thudc hat khoang 2-3 pm, vdi hdm lugng 99,97% (xem bdng 1) dugc dua vao ep Bdngl Thdnh phdn bdt molybden, % c 0,01 Si 0,002 P 0,001 Fe 0,006 Al 0,002 Ni 0,003 Mg 0,003 Ca 0,02 Mo 99,97 Khudn dp dugc thidt kd tir bdn mdnh ghep c6 khdnang thao khudn Idy phdi de dang ^inh I a) Qud trinh dp bdt molybden duge thuc hien trdn may dp thuy lye YH-32 Qui trinh dp mau duge md ta tren hinb lb Dd dam bao tinh dinh hinh va dd bin mdu tuoi sau dp, lue dp dugc can dat 2,5-3 tan Mdu sau ep dat ty trgng 5-6 (mat khodng 50-60%) Kich thudc mdu sau dp Id 025x35mm k/1 •< I ' Bot Molybden+chat bdi tron > 99,9% Mo Axit Steanc, 1% • Hoa hgn voi dung dich hoa trgn va say khd < — Datihda Ee_J- M9tdQ5-6^cm' '' Say ma\i Nlu?td6l20-200°C b) Hinh Qud trinh ep dinh hinh: a)Khudn ep, b) So qui trinh ep ISSN 0866 - 7056 r T ^ CHf CO KHl VlfiT NAM, Sd 1+2 nam 2017 www.cokhivietnam.vn NGHIEN CLfU-TRAO D O I Thuc hi?n thieu kSt phoi bOt kim loai molybden sau ep dinh hinh 16 fhiSu ket co b4o ve agon d6 sach 99,9 % (hinh 2a), 6ng nung gian tiSp graphit (hinh 2b) Lo thieu kSt CO cong suit 38 kW, dai diSu chinh diSn ap thii cip 0-15V, ddng dien tit 0-3000A Chg di?n ap, ddng di$n, cong suit tieu thu, nhiet mmg va thdi gian nung duoc thuc hien nhu mfi ta bang Cac m^u nhin duac sau kbi thito kit duoc m6 ta tren hinh Cac miu sau thieu kit nhiet cao dugc khao sat nghien ciiu theo cac phuomg phap sau: - Phuong phap ty trpng, phSn tich nhilu xa Xray thuc hifn tai Vien Hoa hoc - VJt lieu, Vien Khoa hoc vk Cflng nghe Quan su - Phuong phap hien vi quang hoc xac dinh 16 chiic ti vi tai Phong Thi nghiem Kim loai hpc, Traong Dai hpc Bach Khoa Ha Npi - Phuong phap plian tich SEM, EDX thuc hi6n tai ViSn Ve sinh dich tl Trung uong, Ha Npi Bdng Chi dd dien - nhiet thiiu ket Di|n Sp thu* cip, V 12 Dong nung, A 200-350 700-800 1000-1100 1400-1500 1900-2000 Cong suat thir cap, kW 1,05 4,0 7,7 13,5 24 Nhigt 36 d^t dugc, '•c 200-400 700 - 900 1200-1400 1700-1800 2000-2200 Hinh Mdu molybden nhdn dugc sau thiiu kit ISSN 0866 - 7056 sa TAP CHi CO KHi VIET NAM, Sd +2 nam 2017 www.cokhivietnam.vn ThM gian nung, ph^t 10 10 lO, 10 30-60 ,1, NGHIEN C U ' U - T R M O U O I K E T QUA v A T H A O L U ^ Ket qud ty trgng va xde dinh mat cdc m l u thieu kdt M l , M2, M3 iing vdi thdi gian 30 phiit, 45 phiit vd 60 phut, d thieu kdt nhiet ISOCC, dugc trinh baytrong bang Ket qud nhdn thdy d nhidt thidu kdt da chgn, thai gian thidu ket tang cho phep tang mat dg mdu nhdn dugc Man M l cd mat th4p nhdt Id 77,12% ling vdi thdi gian thieu kdt Id 30 phiit Mdu M3 dat mdt ddn 90,66% thdi gian thidu k^t Id 60 pfaiit Kdt qua citng phii hgp vdi eae cdng bd [2, ] Bdng Ty trgng vd mat dg cdc mdu sgu thiiu kit TT I Mlu Ml M2 M3 Ty troDg 7,867 8,714 9,248 Mat IS, % 77,12 87,14 90,66 Anh hidn vi quang hgc va hidn vi dien tu quet cua eae mdu M2, M3 duge md ta tren cac hinh va hinh a) b) c) Hinh Td chiec te vi molybden v&i phdng dgi xSOO: a) Mdu M2, h) Mau M3, c) Mdu loa phut ddng ca nhiin lieu rdn ca nhd [1] a) b) Hinh Anh SEM cdc mau M2 (a) vd M3 (b) Tuy nhidn, vdn edn nhidu cdc Id rdng ndm rdi rac, xen ke giiia eac hat Cac Id cd thd quan sat ro han trdn dnh SEM (hinh 5a) Sir phan bd ciia cdc Id rdng la chua ddu tren toan khoi, hat to hat bd dan xen vdo Didu ed thd la dnh hudng cua mat sau dp khdng ddu ddn tdi qud trinh khuydch tan kiii thieu kdt cd hieu qud khac d eac vung mat sau ep khdc Cae Id rdng nhu vay, quan sat it thdy tren m l u M3 (xem hinh 4b vd hinh 5b) Mdu M2 mat thdp ban va kich thude hat khoang 1520 pm Mau M3 ed mat cao hem, ed kieh thiiac hat Idn dat khodng 30-40pm Nhu vdy, tang thdi gian thidu kdt dhx tdi tang kich thudc h£it ciia mdu nhdn dugc So vdi td ehiic td vi ciia loa phiit ddng ea hdnh trinh nhien lidu ran ca nhd (hinh 4e) cho thdy td chuc td vi m l u M3 sau thidu kdt (hinh 4b) Id kha tuang ddng Phdn tich EDX bd mat cd M3 (Mnh 6) chi phat hidn hai nguyen td molybden va xy Molybden Id nguydn td chinh va bd mat bi oxy hda mdt chiit Hinh Kit qud phdn tich EDX mdu MS Gian dd nhieu xa Ranghen m l u M3 dugc trinh bay tren hinh 7, cac vi tri xuat hien vach nhidu xa cua mau dugc chi tren bang Nhdn thdy ngoai bdn vach ciia molybden cdn xuat hien hai vach vdi cudng rdt nhd 0,95% vd 0,49% ung vdi cdc gdc 26,0226; 37,0901 vd cdc khoang each mat d Id 3,42421 AO va 2,42395 A Theo 14] day Id cae vach ciia MoO^ vdi ham lugng rdt nhd Tir dnh hien vi quang hgc mdu M2 cho thdy, sau thidu ket khdi bdt da liSn ket voi ISSN 0866 - 7056 T ^ CHi CO KHi VlfiT NAM, Sd 1+2 nam 2017 www.cokhivietnam.vn NGHIEN CU'U-TRAO D I Chd thidu kdt gian tiip:- Dai dien ap didu chmh 12V- 2000A, nhidt nung 1800 "C, thoi gian 60 phut Hinh 12 Gidn nhiiu xg Ranghen mdu M3 Mlu nhdn dugc dat mat 90%, ed td chiic td vi tuang duang nhu mlu loa ph\it dgng ca hdnh trinh ten liia nhien li?u ran ca nhd Cdc phdi molybden ^ac ehe tao theo cdng nghe ndy dap ling duge yeu edu de ehe tao cao loa phut ddng ea ten lua nhidn lieu rdn cd l\rc day viia va Idn • Bdng Vi tri xudt hien cdc vach nhieu xg mdu M3 G«c 26 n 26.0226 37.0901 40.4001 58.4867 73.4763 87.2888 Khoang each m p d [A] 3.42421 2.42395 2.23266 1.57811 1.28885 1.11608 Cu^ng dd I%1 0.95 0.49 100.00 13.45 23.88 6.70 Ngay nh|n bai: 12/02/2017 Ngdy phan bien: 20/02/2017 Thi lidu tham khao: 11] LS Quang Tu^, Trdn Ngoc Thanh, Nguyen [2] Kdt qud phdn tich EDX va phdn lich 5&ay cho thdy, ldi6i phdi kim loai sau thieu kit la molypen kim loai sach khdng lan cac tap chat khac Ham lugng d xy mau khdng dang kd chiing td thay bao vd agon saeh 99,9 % bao dam kha tdt cho phdi khdng hi dxy hda d nhiet cao sudt thdi gian can thiet de dat dugc den mat edn thiet [3] KET LUAN [4] Bang edng nghe luyen krni hgt vdi phuang phap thidu ket gian tiep qua dng nung graphit mdi trudng argon 99,9%, eo thi chd t^o dugc cac phdi molybden hinh tru dat kich thuac 025x35mm [5] Viet Bac; "Vgt lieu kit cdu tin lua", NXB Quan dgi Nhan ddn, 2015,217 tr Trdn Nggc Thanh vd cac cdng sir; "Nghien cuu cdng nghi che tgo loa phut dgng ca hdnh trinh ten liia nhien lieu rdn tie kim logi molybden", Tuydn tap cac bao cdo khoa hpc tai H6i nghi Khoa hpc co di8n tii ViSt Nam, iLi th^ 6, HdNdi, 2012, tr 217-225 P Chhillarl, D Agrawal and J H Adair "Sintering of molybdenum metal powder using microwave energy", Minerals and Mining, Powder Metallurgy 2008 VOL 51 NO 2,2008 Standart X-ray diffraction powder pattents^ NBS monograph 25- section 18 ASM metal handbook, volume 7, "Powder Metal Technologies and Applications"j 1998 ISSN 0866 - 7056 TAP CHI CO KHi VlfiT NAM, Sd 1+2 nam 2017 www.cokhivietnam.vn ... Thanh, Nguyen [2] Kdt qud phdn tich EDX va phdn lich 5&ay cho thdy, ldi6i phdi kim loai sau thieu kit la molypen kim loai sach khdng lan cac tap chat khac Ham lugng d xy mau khdng dang kd chiing... Cflng nghe Quan su - Phuong phap hien vi quang hoc xac dinh 16 chiic ti vi tai Phong Thi nghiem Kim loai hpc, Traong Dai hpc Bach Khoa Ha Npi - Phuong phap plian tich SEM, EDX thuc hi6n tai ViSn... vi tuang duang nhu mlu loa ph\it dgng ca hdnh trinh ten liia nhien li?u ran ca nhd Cdc phdi molybden ^ac ehe tao theo cdng nghe ndy dap ling duge yeu edu de ehe tao cao loa phut ddng ea ten lua
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