t i f iiHiu v i L n n n u n . VA C A N G H G H C MO-LOreN X I M
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NGHIEN cuu CONG NGHE SAN XUAT HOP KIM DONG MAC CAC 320 DUC CHAN V f T T A U T H U Y
ThS. NGUYEN MINH DAT - Vien KH&CN M6-Luyen kim ThS. 0 6 VAN QUANG - Trwimg DHBK Ha Noi
n:
idn nay ITnh vye ddng tau dang dupc quan tdm ddc bidt, hinh thanh mpt hd thing cdc nha may ddng tau hign dgi dap ung nhu d u chd tgo tau vdn tai Idn din hang chyc vgn t i n nhu Nha may ddng tau Pha Rung, Bach Odng Hai Phong, nha mdy ddng tau Huyndai midn Trung.Trong nhung san phdm due d u thdnh tau cd chi tilt chan vjt hien dang ed ydu d u npi dja cao.
Ngoai cde loai tdu Idn ddng mdi su dyng chdn vit nhap khdu, trong vigc sua chua thay t h i cac tau nhd thudng su dung cac loai chdn v\t ban sdn tren thi trudng hoac due tgi cac co sd due trgng nudc chua dam bao chdt luong. Vat lieu due chu yiu td ede loai phi lieu chdn vit nen khdng dam bao ydu d u ky thudt, Tuy gia thanh re nhung tinh canh tranh khdng eao nhdt id khi bude vdo thdi ky hdi nhap Ly do chu yiu vdn Id san xult due tai Viet Nam cdn manh mun, Igc hgu chua ung dung cdng nghd mdi, chua duoc ddu tu thich dang.
Dd tdi "Nghidn cdu cdng nghg san xudt hg'p kim ddng mac CAC 302 due chan vit tau thuy" da xay dung dupe quy trinh hop ly trong vigc ndu tgo mac hpp kim, kilm tra co tinh vgt ligu va kha nang chiu an mdn trong nudc biln. U'ng dung md phdng s l hgn chl tdi da cae khuylt tgt due va dua ra cdng nghg due tdi uu nhdt. Da due dupe mdt s l chi tilt chdn vit logi vua cho kit qua dat chit luang tdt v l cac chi tieu ca tinh cung nhu an mdn.
1. So' dd cdng nghe
So dd cdng nghe thd hign tren hinh H.I.
2. Nghien cu'u xac tap cac thong sd cong nghe va quy trinh ndu luyen hp-p kim CAC-302
2.1. Anh hwdmg cua nhiet do nau luyen hap kim d4n kha nang hda tan Fe
Didu kien thi nghiem: Que khuly Titan cd tilt dien 10 mmx25 mm, Fe dgng phoi dua vao vdi khdi lupng I n djnh la 1 %; ndu trong Id trung t i n vdi ndi graphit dung tich 15 kg; khli lupng me ndu 5 kg, trp' dung che phu la than cui; thdi gian giif d cac nhiet do d n khao sat la 20 phut; cdc khoang
nhidt do d n khao sdt Id 1100 "C, 1150 °C, 1200
°C, 1250 "C vd 1300 °C O eac nhidt dd khao sat Idy miu phan tich hda d l xde dmh % Fe tu dd xdc dmh khoang nhidt do hp'p ly.
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H.2. Anh hu^ng cOa nhiet dg den
1
kha nang hda tan cua Fe vao hap kim.
CONG Mdsti4-2012
u^
45 NAM V I C H KHOA HOC VA CAtSl.., S 1.8:=
H 3 Anh hu&ng cua nhiet dd kim IOQI Idng den khi nang hoa tan cua Mn vao hgp kim.
: nghidm t h i y r i n g d cdc nhidt d d t h i p OOX) Fe hda tan khdng n h i l u (~ 50%), Qua t h u c r
(1150 vd 1200"C
khi dd Fe ed hidn t u p n g vdn c y c n l i Idn xf. Khi dgt nhi^t dd 1300°C, kim logi long lodng h o n , Fe cd dieu ki$n hoa tan h i t N h u vdy nhi^t dO h p p ly d d d y l d 1 3 0 0 ° C
2.2 Nghien c u u anh h u d n g cua nhl^t dp n i u luyen h a p kim d i n kha ndng hda tan Mn
Didu kien thi nghiem tiln hdnh t u a n g t u n h u trdn. sau khi ndu chay h a p kim Idng, hg nhiet dg d i n nhidt do d y tinh tidn hdnh cho Fe-Mn vao T h d i gian g i u nhiet 20 phut
Cae khoang nhiet d d d n khao sat la ISOO^C, 1250°C, 1200°C, 1150°C. O cae nhiet d d khao sdt Idy m i u phan tieh hda d d xac djnh % M n t u do xac dmh khoang nhiet dp h o p ly.
2.3 Anh h u d n g cua nhidt dp n i u luydn h p p kim d i n s y chay hao kim loai k e m
D i l u kien thi nghiem t u o n g t y n h u tren. Nhidt dp khao sat d u o c ha d cac m d e 50, 100, 150, 200°C. (nhiet dp t r u d e khi hg nhidt Id 1200°C). Z n cho vdo h p p kim Id 38 %. O cac nhidt dp ndy cho Zn vdo h p p kim c h d chay h i t , k h u l y ddu vd rdt ra l l y m§u phdn tich % Zn d l xdc dmh nhidt dd d u a Z n vdo h p p ly va l u p n g chdy hao cua h p p kim.
I20
• S I O
S'
so 100 150 200
H.4. Anh hu-dng cua muc <3d ha nhi^t dO hi)tp kim Idng din sif chiy hao Zn.
3, Due chi ti^t chan vjt
Trong qu6 trinh thi,i'c hi^n d4 tai, theo y6u clu thyc t^ tgi xu'dng due, c^c chi tilt due thu-b-ng ET nhilu khuylt t^f nhu rS ngbt, cong v§nh, I t h t i f l
diln diy. "
NguySn nhSn id tai xi^ong due ap dung phuang phbp dCie rit tru'c tilp vSo phin trSn cua v^t due.
Nhdm thi,re hi^n d l tSi da tiin h4nh phan tich cSng ngh$ due, due thi> bang phin mim ProCast vdi nh&ng thay d l i v l vi tri rdt, each b l tri d$u ngdt..
d l tif dd tim ra cdng ngh$ due tlt nhit.
Qua dd da dua ra du'<;^c cdng ngh? due tii Lfu nhi^ sau (H.5).
Chi tilt chan vjt du&njjkinh 300mm
eien day 100%, sau khi rot 35s
cat qua tam sau kh\ dong dac
H.5. Cdng ngh0 due toi uv 4. K i t qu^ thir nghidm an mon di#n h6a trong moi trird'ng niroc b i l n
Kit qua thi> nghiem an mdn di§n hoa trong mfii trud-ng nu'd'c biln the hi$n trSn Bang 1.
CiNG NGHllP MO S6«-2012
45 NAM VIEN KHOA HOC VA C A N G NGHC M O - L O Y I N KIM
J ^ ^
Bang 1.
Ngay 7/12/10 Sau 15p
7/12/10 Sau 3h 7/12/10 Sau 24h 7/12/10 Sau 24h
iyi1:(S=10.76cm") 1 (xio-'A/cm')
6,713 7,419 1,901 2,670
E(V) -0,199 -0,196 -0,159 -0,172
M2:(S=10.75cm' I(x10-7 A/cm')
14,740 0,423 1,899 2,002
E(V) -0,256 -0,308 -0,371 -0,370
M3:(S=3.14em' I(x10-7 A/cm')
46,910 22,52 14,82 45,46
E(V) -0,255 -0,559 -0,472 -0,467
H.7. Cic loai mSu: 1 - f/lSu 1 Vat lieu CuNi 90- 10: 2- Mau 2 Vat lieu CAC 302; 3 - MSu 3 Vat lieu CuZn40.
5. K i t qua phan tich
Thanh phan hda hgc thu dugc trong Bang 2. Co- tinh thu dugc trong Bang 3.
Sang 2.
Cu 57,2
Al 0,98
Mn 1,95
Fe 1,23
Zn 37,7
Tap chat 0,94 Bang 3.
So TT L59-1 CAC-302
sau due CAC-302 sau
nhiet luyen Dd ben
N/mm^
234,8 498,8 514,6
Do cung HB 78,2 95,2 105,4
Do deo
%
18 10 14 6. U'ng dvingDe tai da ndu due thanh cong mac hpp kim CAC-302 dgt tidu chudn vd dOc dup-c mOt s6 chdn vjt CO chdt luang han hin chdn vjt dCic ti> cdc v$t
ligu cu vdi gid thdnh thip D$c bidt vdi tinh chit ca tinh vd Sn mdn tuang duang mdc CuNi 90-10 vd vupt trdi so vdi mdc hpp kim CuZn40Pb vd gia thdnh chf tuong duong mdc CuZn40Pb ndn cd t h i khdng dinh mdc hap kim nghidn cdu cdgid trj v l ca chit lupng vd kmh t l .
Do vdy tinh ung dyng cua d l tdi trong thyc te cao. Tgt Cdng ty CP Co khi Vgn Dilm, Cdng ty Co khi Y Ydn. Nam Djnh da budc d i u thay t h i mac hpp kim CAC-302 nhdm ndng eao chdt lupng san phim vdi gid thanh hpp ly* nhit D
TAl LIEU THAM K H A O
1. Cfng dyng mgt so loai hpp kim dong, hop kim nhdm co tinh cao trong thilt bj khai thdc mo, Tuyln tap bdo cao Hdi nghi KHKT Md toan qude ldn thu XVI, 2004.
2 Cac phuang phap due dac bidt NXB KHKT 2006.
3. ASTM Standards on Copper and Copper alloys. American Society for testing Materials, 1957.
4. Researches concerning heat treatment effects upon the morphology of high- tensile foundry brass structure Adriana Freda, Dionisie Bojin, Sanda Maria Levcovici Google com.
5. Corrosion behaviour of copper alloys in natural sea water and polluted sea water.pdf Google.com.
6. Copper marine corrosion - i. corrosion rates in atmospheric and seawater environments of Peruvian port.pdf. Google com.
7. Resistance to General Corrosion, Crevice Corrosion and Impingement attack in sea vi/ater.mht. Google.com.
Ngwdn bien tap: Tran Van Trach
aper introduces the technology producing bronze alloy CAC 302 to cast ship screw. This study results are using in some casting enterprises.
CONG NGHIEP MO sti 4-2012
