(1) Cov yam ntxwv ntawm kev sib txhuam ntawm cov khoom siv txhuas matrix feem ntau suav nrog cov khoom me me (xws li whisker) thiab cov khoom siv fiber ntau. Cov ntaub ntawv siv rau kev txhawb nqa feem ntau suav nrog B, CB, SiC, thiab lwm yam.
Thaum cov khoom sib xyaw ua ke ntawm cov txhuas matrix raug brazed thiab cua sov, cov matrix Al yooj yim rau kev cuam tshuam nrog theem reinforcing, xws li kev sib kis sai ntawm Si hauv cov hlau filler mus rau lub hauv paus hlau thiab kev tsim cov txheej brittle dumping. Vim muaj qhov sib txawv loj ntawm cov coefficient nthuav dav ntawm Al thiab theem reinforcing, kev cua sov brazing tsis raug yuav ua rau muaj kev ntxhov siab thermal ntawm qhov sib txuas, uas yooj yim ua rau pob qij txha tawg. Tsis tas li ntawd, qhov ntub dej ntawm cov hlau filler thiab theem reinforcing tsis zoo, yog li qhov chaw brazing ntawm cov khoom sib xyaw yuav tsum tau kho lossis siv cov hlau filler ua haujlwm, thiab yuav tsum siv lub tshuab nqus tsev brazing kom deb li deb tau.
(2) Cov khoom siv sib xyaw thiab cov txheej txheem B lossis SiC particle reinforced aluminium matrix composites tuaj yeem sib xyaw, thiab kev kho qhov chaw ua ntej vuam tuaj yeem ua tiav los ntawm kev sib tsoo ntawv xuab zeb, kev ntxuav txhuam hlau, alkali ntxuav lossis electroless nickel plating (txheej txheej tuab 0.05 hli). Cov hlau filler yog s-cd95ag, s-zn95al thiab s-cd83zn, uas tau cua sov los ntawm nplaim oxyacetylene mos. Tsis tas li ntawd, lub zog sib koom ua ke siab tuaj yeem tau txais los ntawm kev khawb brazing nrog s-zn95al solder.
Siv lub tshuab nqus tsev vuam siv tau rau kev sib txuas ntawm cov khoom siv sib xyaw ua ke Short Fiber Reinforced 6061 aluminium matrix composites. Ua ntej vuam, qhov chaw yuav tsum tau sib tsoo nrog 800 daim ntawv abrasive tom qab sib tsoo, thiab tom qab ntawd vuam hauv lub cub tawg tom qab ntxuav ultrasonic hauv acetone. Al Si brazing filler hlau feem ntau yog siv. Txhawm rau tiv thaiv kev sib kis ntawm Si rau hauv cov hlau hauv paus, ib txheej ntawm cov ntawv ci txhuas ntshiab tuaj yeem coated rau ntawm qhov chaw vuam ntawm cov khoom sib xyaw, lossis b-al64simgbi (11.65i-15mg-0.5bi) brazing filler hlau nrog lub zog brazing qis dua tuaj yeem xaiv tau. Qhov kub yaj ntawm cov hlau brazing filler yog 554 ~ 572 ℃, qhov kub brazing tuaj yeem yog 580 ~ 590 ℃, lub sijhawm brazing yog 5 feeb, thiab lub zog shear ntawm qhov sib koom ua ke yog ntau dua 80mpa.
Rau cov khoom siv graphite uas muaj zog dua los ntawm cov txhuas matrix composites, kev siv brazing hauv lub cub tawg tiv thaiv huab cua yog txoj hauv kev zoo tshaj plaws tam sim no. Txhawm rau txhim kho qhov ntub dej, yuav tsum siv Al Si solder uas muaj Mg.
Ib yam li kev siv lub tshuab nqus tsev txhuas los txhuam, qhov ua kom cov khoom sib xyaw ua ke ntawm cov txhuas matrix tuaj yeem txhim kho tau zoo los ntawm kev qhia txog mg vapor lossis Ti suction thiab ntxiv qee qhov Mg.
Lub sijhawm tshaj tawm: Lub Rau Hli-13-2022