THÔNG TIN TÀI LIỆU
NGHIEN CLfU-TRAOPQl ^ NGHIEN CU'U ANH HUONG C O A MAT DO DONG DIEN VA NHIET 0 DUNG DICH DEN CHI^U DAY LOP MA Ni-AI,03 RESEARCH ABOUT EFFECT OF ELECTRIC CURRENT DENSITY AND BATH TEMPERATURE TO Ni-Al,0, PLATE LAYER WIDTH Pham \ ^ n D6ng', Pham Van Bong', TrUOng DiKc l h i | p ' •TrilSng Dai hoc Cong nghiep Ha Noi 'Trudng Cao dang nghe Co Idii Nong nghiip TOMTAT Hien nay, CO rdt nhieu phUdngphdp ndng cao chdt lUdng be mat chi tiet kim loai nhu ma diin, ma hoa, xii ly be mat, nhdm bdo ve be mat chi tiet kim loai, gidm dn mon, tdng khd ndng chiu im mon, ndng cao tuoi thg cho cdc chi tiet mdy vd thiet bi Ma composite Al^O^ tren nen Ni ldphii{)n§ phdp too len tren be mat chi tiet ldp ma CO hai pha, pha nen kim loai vd pha CO hat ciing cdc hat cjin nho min, phdnbd cdu true cua ldp ma tac nen tinh chdt cd ly dac biet, co khd ndng chiu mdi mdn, gidm dn mim hda hgc vd ndng cao tinh on dinh d nhiet cao PhUdngphdp ma composite Ni-Mp^ Id phudng phdp co nhieu Uu diem vUdttrgi, tU nhUng ket qud nghien citu cho phep cdc nhd cong nghe ItXa chon thong so cong nghe toi Uu ma, chgn gidi phdp thiet k^, ch^tqo vd phiic hoi cdc chi tiet dt ndng cao chdt lUdng be mat, tdng dg ben mdn vd tudi thg cho cdc chi tiet mdy Tii khoa: Chieu ddy ldp mii Ni-Alp^, Mat dong di$n ma, nhiet dung dich ma ABSTRACT There are many methads to improve the quality of metal parts surface such as plating electroplating, surface treatment etc to protect metal parts surface,minimize eroding increasevm resistance, increase the longevity of parts and equipments Alp^ composite plating in the Ni backgnmi is a method which creates two phases at the surface of plate layer product: metal background phase ani fine solid grain phas which is distributed in the structure of plate lager to create physico-mechaniai with ability of wear resistancce and chemical erode reudction as well as improve the consistency a temperature Ni-Alp^ composite plate method has significant advantages Its research result helps exp technology to choose the best technology statistics during plating choose design solution, parts mam4ac and recovery to strengthen surface quality increase wear resistance and longevity of machine partsti Key words: Ni-Alfi^ plate layer width, plating electric current density, plating bath temperatl^ ISSN 0866-7056 TAP CHi CO KHi VIET NAiM, S6 nam 2016 www.cokhivietnam.vn NGHIEN CU'U-TRAO D ! l.DATVANDE nong dp chat dien phan, hinh dang catot, toe dp va tinh chat dong chay; Giai doan ba la sU chon lap (che phu) cua kim loai ket tua len cac hat [6], giai doan se quyet dinh so lUpng hat phan tan 16p phu, moi lien ket ben viing va cau true ciia cac hat ldp ma Ma dien composite tr^n ccf sd cua ma dien thudng, nhiing ma dien composite co cac hat ciing, sU co mat cua cac hat ciing cai thien tinh chat cua lorp ma nhU: Tang ben mon, kha nang lam viec d nhiet dp cao, tang dp ciing be mat chi tiet [1,6] Cac san pham nhii khuon, dung cu do, xi lanh, cac tiep diem nganh Cong nghiep dien tii dupc ma composite de nang cao kha nang chiu mai mon, chong dinh, tU boi tron Chat lupng be mat chi tiet sau ma composite dUpc danh gia bcfi nhieu thong so [8,9] nhU: Chieu day ldp ma, bam dinh, ham lupng hat, dp dong deu, dp an mon, dp cdng ciia ldp ma Cac yeu to anh hUdng den chat lUpng ldp ma phu thupc vao mat dp dong dien, toe dp Ichuay, nhiet dp, dp pH, d6 dan dien ciia vat lieu ma Trong bai viet nay, nhom tac gia trinh bay ket qua nghien cUu anh hUdng cua thong s6 mat dp dong dien va nhiet dp dung dich den chieu day ldp raa Ni-Al^O^ Tren the gi6i hien nay, co nhieu cong trinh nghien oiu ve ma composite titan-alumihum nitride tren n^n thep, Ni-Aip^, nikel/alumina nano-particles composite coating, NiPSi^N^, Co-composite plating, Ni-composite v6i hat Mo [ 12] Tuy nhien, tai Viet Nam ma dien composite chUa dupc quan tam va dSu tU dung mUc ban THU'C NGHIEM che ve trinh ky thuat, kinh t& 2.1 Vat lieu va thiet bj thUc nghiem Qua trinh ma composite dupe chia lam ba giai doan [2,5,7], giai doan dau la sU chuyen dpng ciia cac phan tU pha phan tan va cac ion dung dich huyen phii den catot, sU chuyen dpng chu yeu dUa vao su d6i lUu, lang dpng, khuech tan, che dp chay tang, chay roi cua chat long; Giai dogin tiep theo la sU bam dinh cua cac phan tU pha thU hai (hat cUng) len be mat catot, cac phan tU chuyen dpng, lUc hap phia cac phan tii tren cactot phu thupc vao kich thUdc hat Hien nay, rat nhieu cac chi tiet dUpc sU dung ma composite Ni-Al^O^ nhu chi tiet chay, coi ciia khuon dap Trong thi nghiem nay, chi tiet thUc nghiem che tao bdi vat lieu la thep SKDll (JIS G4404), kich thUdc dUdng kinh mau thUc nghiem la 025^^^^, chieu dai 50mra, phan hoa hpc mac thep the hien bang 1, hinh anh chi tiet dung de thUc nghiem the hien d h i n h Bdng Thdnh phdn hoa hoc cdc nguySn t6 chinh (%) Vat li«u SKDll C Si S P Mn Cr IVlo V 1,486 0,316 0,015 0,017 0,438 12,263 0,869 0,336 Hinh Mau diingthUc nghien Hinh2.BemaNi-Al,0^ Hinh Kinh hien vi diin ti(JEOL JSM.6490LV c ISSN 0866 - 7056 TAP CHf CO KHI VIET NAM, S6 nam 2016 vvTvw.cokhivietnam.vn NGHISN CIJU - TRAO OOl - Vat lieu hat ctog duoc chon lam thi nghiem la hat A l a CO kich thudc 0,2nm ° • 2.3.2 SS tht nghiem va thongsS tM n^ihn • So lilong thi nghiem: - Hinh anh be ma composite Ni-Al,03 th« hien tren hinh S6 thi nghiem duoc xac dinh theo conj thiic: - Hinh anh kinh hien vi dien tfl quet SEM (hinh 3) N = 2" + k + l 2.2 Phuong phap thtfc nghiem Trong do: k la bien dau vao (2) Nghien cijtu duoc thilc hien tren cac mlu p^oi Wong quan giCta cac thong so thi chua qua stl dung, che tao bdi vat lieu SKDll nghiem mo ta theo so hinh Sau cac mau duoc xac dinh mac thep, Uen hanh gia cong chi tiet dat gia tri nham Ra = c j^- big^ ^^^ yao dieu khien dupc: l,25-i-2,5^m, liun sach chi tiet, hoat hoa be mat bang H,SO^ (5%), r i a sach bang nU6c roi tien ^ ^^^^ ^^ j ^ ^ g ^ ^ ^ Q ^ (A/dm^); himh mj Sau ma chi tiet dU
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