(1) Brazing yam ntxwv aluminium matrix composites feem ntau suav nrog particle (suav nrog whisker) reinforcement thiab fiber reinforcement.Cov ntaub ntawv siv los txhawb nqa feem ntau suav nrog B, CB, SiC, thiab lwm yam.
Thaum cov aluminium matrix composites yog brazed thiab rhuab, lub matrix Al yog ib qho yooj yim rau hnov mob nrog rau lub sij hawm reinforcing, xws li sai diffusion ntawm Si nyob rau hauv muab tub lim hlau mus rau lub hauv paus hlau thiab tsim ntawm brittle dumping txheej.Vim muaj qhov sib txawv loj hauv kev nthuav dav coefficient ntawm Al thiab lub zog ntxiv, cov cua sov tsis zoo yuav ua rau thermal stress ntawm qhov sib txuas, uas yooj yim ua rau kev sib koom ua ke.Tsis tas li ntawd, lub wettability nruab nrab ntawm cov hlau muab tub lim thiab cov theem reinforcing yog qhov tsis zoo, yog li lub brazing nto ntawm cov khoom sib xyaw yuav tsum tau siv los yog siv lub tshuab nqus tsev, thiab lub tshuab nqus tsev yuav tsum siv kom deb li deb tau.
(2) Brazing cov ntaub ntawv thiab txheej txheem B los yog SiC particle reinforced aluminium matrix composites tuaj yeem brazed, thiab kev kho saum npoo ua ntej vuam tuaj yeem ua tiav los ntawm cov ntawv xuab zeb sib tsoo, xaim txhuam, ntxuav alkali lossis electroless nickel plating (txheej thickness 0.05mm).Cov hlau muab tub lim yog s-cd95ag, s-zn95al thiab s-cd83zn, uas yog rhuab los ntawm cov nplaim oxyacetylene.Tsis tas li ntawd, kev sib koom ua ke siab tuaj yeem tau txais los ntawm kev sib tsoo brazing nrog s-zn95al solder.
Nqus brazing tuaj yeem siv rau kev sib txuas ntawm Short Fiber Reinforced 6061 aluminium matrix composites.Ua ntej brazing, saum npoo yuav tsum tau hauv av nrog 800 abrasive ntawv tom qab sib tsoo, thiab tom qab ntawd brazed hauv lub cub tawg tom qab ntxuav ultrasonic hauv acetone.Al Si brazing muab tub lim hlau feem ntau yog siv.Txhawm rau tiv thaiv kev sib kis ntawm Si rau hauv lub hauv paus hlau, ib txheej ntawm cov ntshiab txhuas ntawv ci barrier txheej tuaj yeem coated rau ntawm qhov chaw ntawm cov khoom sib xyaw, los yog b-al64simgbi (11.65i-15mg-0.5bi) brazing muab tub lim hlau nrog qis brazing zog tuaj yeem xaiv.Lub melting kub ntau yam ntawm brazing muab tub lim hlau yog 554 ~ 572 ℃, lub brazing kub yog 580 ~ 590 ℃, lub sij hawm brazing yog 5min, thiab lub zog shear ntawm qhov sib koom ua ke yog ntau dua 80mpa
Rau graphite particle reinforced aluminium matrix composites, brazing nyob rau hauv kev tiv thaiv cua sov yog txoj kev vam meej tshaj plaws tam sim no.Txhawm rau txhim kho lub wettability, Al Si solder muaj Mg yuav tsum tau siv.
Raws li nrog txhuas lub tshuab nqus tsev brazing, lub wettability ntawm aluminium matrix composites tuaj yeem txhim kho tau zoo los ntawm kev qhia txog mg vapor lossis Ti nqus thiab ntxiv qee qhov Mg.
Post lub sij hawm: Jun-13-2022