tiểu luận composite

8/3/2019 tiu lun composite

1/23

TIU LUN MN COMPOSITE

TI: SN XUT LI CT TRONGDNG C CT KIM LOI NN :COBAN CT: WC,TaC, TiC .

GVHD: HUNH TH VIT H SVTH: H VN AN MSSV: 10343001


2/23

LI M U

Trong cuc sngngy nay composite c ng dng rngri trong i sng nh: cc thit b trong cng ngnh cng nghip, y t, thit bdn

dng, gia dng, Trong lnh vc c kh ngy cng i hi nhng loi hpkim cngdng lm dng c ct gt.

Trong bi tiu lunny ti xin c gii thiu vicc bn phngphp ch to li ct hp kim datrn nncoban ctW,Ti , Ta,


3/23

NI DUNG

Khi nim Composite ctht l loi vt liu gin on,

khc si l khng c kch thc u tin. Lovt liu composite ct ht ph bin nht chl b tng, thng li c gi ngn gn chb tng


4/23

ng dng cacomposite ct ht trong ch to li ctkim loi

Nguyn liu Vt liu nn Coban: l kim loi cng, gin c mu trngxm

v c tnh st t. Cc hng s vtl quan trng: Nhit nng chy(C)1495 Nhit si ( C)3100 Nhit thnghoa (kJ/mol)425T khi8,90 cng5,5 dn in10


5/23

ng dng cacomposite c t ht trong ch to li ctkim loi

Vt liu ct: Wolfram: c tnh cng, gin, c mu trng

xm nh kim trong iu kin th ng, c bitnng chy 3.422 OC, cao nht trong s tt c cckim loi va cao th hai trong tt c cc nguyn t ch sau carbon (C). Wolfram c t trng 19,25g/cm 3 (g n tng ng v i vng tinh cht 19,3g/cm 3). nhit 400 OC, wolfram kt h p v ioxy to thnh oxit wolfram (WO 3) c mu vngnht.


6/23


Vt liu ct: Tantan: l mt kim loi nng, mu xm nht, hi

phn pht xanh lam lng lnh. Vtnh kh chy (nhit nng chy ca n l gn3000 C) thn ch thua vonfram v reni m thi. Ngoi bn v cng cao, n cn c tnh do tuyt vi.Tantan nguyn cht d gia cng c hc, d dp,d cn thnh l mng (c chiudy vo khong vi phn trm milimet) v dko thnh si.


7/23


Vt liu ct: Titan thucnhm kim loic nhit nng chycao,

bnring cao hnthp, nh hnthp v c tnhchng n mn cao. S dngtitan lm nncho cccomposite ct sikhc nhau nh siMo, B, SiC, Benhm m rng nhit lm vicln n700 800 0C.

Titan c tnh khthi cng ngh ttkhi bin dngnng,hn c, c kh nng gi c bnlu ( 360 1050 Mpa ) nhit cao ( 300 450 0C ). Tuy nhin,nhng vt liuny c bin dng rtb ( thmch nhit cao ), v thkhi ch tocomposite vicc si gin, nht thit phi s dng c ch bin dng do ( nhit rtcao ).


8/23


Hpkim cng(HKC) Vt liutrn c s hn hp nhngcacbua c

nhit nng chyv cng rtcao (WC,TiC, vv,) vi cht ktdnh coban, st, niken(Co, Fe, Ni) c kh nng chngmi mn cao,chu cmi trng n mn v nhit cao.HKC c s dng rngri ch toccdng c ct, khun ci, khoan a chtvnhiu lnh vc c bitkhc.


9/23


Thnh ph n ch yu ca mi loi hpkimcngl cacbit: WC ( chim t lcao nht), TiC,TaC rt cngv nhit chy rtcao, ngoi racn c lng nhcban lm chtdnh kt, nh vy bo m cng, tnh chngmi mn vcngnng rtcao, hn na y l bn cht t nhin khng phiqua nhit luyn.


10/23


Hpkim cng c ch toqua cc bcsau:- To btcacbit bngcch hon nguyn WO3 bng hyr 700-9000C c btW ri em nghin, sng ly c ht nh0,10 - 0,15n3 - 5m,sau trn btW vi bhng v nung ln 14000C

trong 1h c btWC.- Trn btcacbit vi btCo ,TaC, TiC , WC.trong nhiu gi chotht u ri emp thnh li ct nh, hnh dng n gin.

- Thiu kt: Chi titsau khi cp tohnh c avo thiukt. T 0 thiu kt= (0,7 - 0,9) T 0 chy cakim loi ch yu,tanung nhit cao (14500C) Co bin mm, bt u chy, dnhch tcc htcacbit vinhau thnh khi chc -Gia cng l n cui: ha nhit, nhit luyn...


11/23

Quy trnh ch to li ct(insert)ca dng c ctkim koi

Nguyn liu ch tobao gm:- BtC ban- BtCc-bt Wolfram- Cc thnh ph n ph: Cc-bt Ti-tan, Cc-bt tan-tan ...


12/23


Cc loi bt c trn u, p thnh ming theo dngtiu chun, kimtra lihnh dng


13/23


Cc loi bt c trn u, p thnh ming theo dngtiu chun, kimtra lihnh dng .


14/23


Thiu ktinsert, sau thiu kt, thtch insertchcn 50% so vi trcthiu kt


15/23


Mi liinsert, tkch thctheo tiu chun


16/23


Viinsert gmhay CBN, phimi sa li tng cng


17/23


Vi1 s kiuinsert, phiv trn ph n li ct tng cng


18/23


Phinsert, vi nhiu lp phkhc nhau


19/23


Phinsert, vi nhiu lp phkhc nhau


20/23


Kimtra l n cui, in k hiu, ng hpv lu kho


21/23

Mt s sn phm:
http://ca7.upanh.com/17.887.22281431.o2N0/daotiencung.jpg


22/23

Sn phmc Ch yu vnl WC,

c thm 3 - 8%TiC, 3- 12%TaC v 8 -12%Co

Tnh cht: gia cngvt liu cng, bn cao, bn unkm

cng: trn 70HRC Nhit lm vic:

800 1000 0C Tc ct: 400m/ph
http://ca7.upanh.com/17.887.22281431.o2N0/daotiencung.jpg


23/23

Kt lun Cc composite cng tinh c nncoban ho c hp

kim Co- Wc c tnh v bnnng rtcaonhngn b hn ch s dngdo chnh b i s hn ch s dng cacoban.

Composite ct ht nn ht mn( Co, Wc,Ti,Ta..) c ng dnglm li ct ca dng c ct

kim loi. , chngmi mn rtcao, cngnng rt cao, ct c vi tc rtcao (hng trm m/min), nhngc nhc iml gin.

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