1.Kodi gawo lililonse la chinthu chilichonse chomangira matrix a diamondi ndi chiyani?
Udindo wa mkuwa: Zosakaniza zamkuwa ndi zamkuwa ndizitsulo zomwe zimagwiritsidwa ntchito kwambiri pazida za diamondi zomangira zitsulo, ndipo ufa wa electrolytic ndi womwe umagwiritsidwa ntchito kwambiri.Ma aloyi opangidwa ndi mkuwa ndi amkuwa amagwiritsidwa ntchito kwambiri chifukwa zomangira zamkuwa zimakhala ndi zinthu zomveka bwino: kutentha kwa sintering kutsika, kupangika bwino komanso kusakhazikika, komanso kusamvana ndi zinthu zina.Ngakhale mkuwa sanyowetsa ma diamondi, zinthu zina ndi zosakaniza zamkuwa zimatha kusintha kwambiri kunyowa kwawo ku diamondi.Chimodzi mwazinthu monga Cr, Ti, W, V, Fe zomwe zimapanga mkuwa ndi carbides zitha kugwiritsidwa ntchito popanga zida zamkuwa, zomwe zimatha kuchepetsa kwambiri kunyowa kwa aloyi amkuwa pa diamondi.Kusungunuka kwa mkuwa mu chitsulo sikwapamwamba.Ngati pali mkuwa wambiri muchitsulo, umachepetsa kwambiri kutentha kwa ntchito ndikupangitsa kuti zinthu ziwonongeke.Mkuwa ukhoza kupanga njira zosiyanasiyana zolimba ndi faifi tambala, cobalt, manganese, malata, ndi nthaka, kulimbikitsa masanjidwewo zitsulo.
Ntchito ya malata: Tini ndi chinthu chomwe chimachepetsa kugwedezeka kwamadzi amadzimadzi ndipo chimakhala ndi mphamvu yochepetsera kunyowa kwa ma alloys amadzimadzi pa diamondi.Ndi chinthu chomwe chimawongolera kunyowetsa zitsulo zomangika pa diamondi, kumachepetsa kusungunuka kwa ma alloys, ndikuwongolera kukhazikika kwa kukanikiza.Chifukwa chake Sn imagwiritsidwa ntchito kwambiri pazomatira, koma kugwiritsa ntchito kwake kumakhala kochepa chifukwa cha kukula kwake kwakukulu.
Udindo wa zinki: Mu zida za diamondi, Zn ndi Sn zili ndi zofanana zambiri, monga malo osungunuka otsika komanso kupunduka kwabwino, pomwe Zn siyabwino kusintha kunyowa kwa diamondi monga Sn.Kuthamanga kwa nthunzi kwachitsulo Zn ndikwambiri ndipo ndikosavuta kutulutsa mpweya, kotero ndikofunikira kulabadira kuchuluka kwa Zn komwe kumagwiritsidwa ntchito pazomangira zida za diamondi.
Ntchito ya aluminiyamu: Chitsulo cha aluminiyamu ndi chitsulo chowala kwambiri komanso deoxidizer yabwino.Pa 800 ℃, ngodya yonyowa ya Al pa diamondi ndi 75 °, ndipo pa 1000 ℃, ngodya yonyowa ndi 10 °.Kuonjezera ufa wa aluminiyumu pa zomangira zida za diamondi kumatha kupanga carbide gawo Ti Å AlC ndi intermetallic compound TiAl mu matrix alloy.
Udindo wa chitsulo: Chitsulo chimakhala ndi ntchito ziwiri mu binder, imodzi ndi kupanga carburized carbides ndi diamondi, ndipo ina ndiyo kusakaniza ndi zinthu zina kuti kulimbikitsa masanjidwewo.Kunyowa kwachitsulo ndi diamondi ndikwabwino kuposa mkuwa ndi aluminiyamu, ndipo ntchito yomatira pakati pa chitsulo ndi diamondi ndi yayikulu kuposa ya cobalt.Mpweya woyenerera wa kaboni ukasungunuka mu Fe-based alloys, zimakhala zopindulitsa pakugwirizana kwawo ndi diamondi.Kuyika kwapakatikati kwa diamondi ndi ma aloyi opangidwa ndi Fe kumatha kukulitsa mgwirizano pakati pa chomangira ndi diamondi.Kuthyoka pamwamba sikosalala komanso kopanda kanthu, koma kumakutidwa ndi aloyi, chomwe ndi chizindikiro cha mphamvu yomangirira.
Udindo wa cobalt: Co ndi Fe ali m'magulu osinthika, ndipo mikhalidwe yambiri ndiyofanana.Co amatha kupanga carbide Co ₂ C yokhala ndi diamondi pansi pamikhalidwe inayake, ndikufalitsanso filimu yopyapyala kwambiri ya cobalt pamwamba pa diamondi.Mwanjira imeneyi, Co imatha kuchepetsa kusamvana kwapakati pakati pa Co ndi diamondi, ndipo imakhala ndi ntchito yayikulu yomatira ku diamondi mu gawo lamadzimadzi, ndikupangitsa kuti ikhale yabwino kwambiri yolumikizirana.
Ntchito ya faifi tambala: Mu binder ya zida za diamondi, Ni ndi chinthu chofunikira kwambiri.Mu ma aloyi a Cu, kuwonjezera kwa Ni kumatha kusungunuka ndi Cu, kulimbitsa matrix alloying, kupondereza kutayika kwachitsulo chotsika, ndikuwonjezera kulimba komanso kukana kuvala.Kuwonjezera ma aloyi a Ni ndi Cu ku Fe kumatha kuchepetsa kutentha kwa sintering ndikuchepetsa kutentha kwazitsulo zomangika pa diamondi.Kusankha kuphatikiza koyenera kwa Fe ndi Ni kumatha kukweza kwambiri mphamvu yogwira ya Fe based binders pa diamondi.
Udindo wa manganese: Mu zomangira zitsulo, manganese amakhala ndi mphamvu yofanana ndi chitsulo, koma ali ndi kuthekera kokwanira komanso kutulutsa mpweya, ndipo amatha kukhala ndi okosijeni.Kuchulukitsa kwa Mn nthawi zambiri sikukhala kokwera, ndipo chofunikira kwambiri ndikugwiritsa ntchito Mn pochotsa ma deoxidation panthawi ya sintering alloying.Mn otsala atha kutenga nawo gawo pakuphatikiza ndi kulimbikitsa matrix.
Udindo wa chromium: Metal chromium ndi chinthu cholimba chopanga carbide komanso chinthu chomwe chimagwiritsidwa ntchito kwambiri.Mu diamondi groove saw blade matrix, pali chromium yokwanira kuti ikhale ndi mphamvu yochepetsera mawu, yomwe imagwirizana ndi mphamvu yotsegulira ya Cr.Kuonjezera pang'ono Cr ku Cu based matrix kungachepetse kunyowa kwa aloyi yochokera kumkuwa kupita ku diamondi ndikuwonjezera mphamvu yomangirira ya aloyi yochokera kumkuwa kupita ku diamondi.
Udindo wa titaniyamu: Titaniyamu ndi chinthu cholimba chomwe chimapanga carbide chomwe ndi chosavuta kuyimitsa komanso chovuta kuchepetsa.Pamaso pa mpweya, Ti amakonda kupanga TiO2 m'malo mwa TiC.Chitsulo cha Titaniyamu ndi chinthu chomangika bwino chokhala ndi mphamvu zolimba, kuchepetsa mphamvu pang'ono kutentha kwambiri, kukana kutentha, kukana dzimbiri, komanso malo osungunuka kwambiri.Kafukufuku wasonyeza kuti kuwonjezera kuchuluka kwa titaniyamu ku matrix a diamondi blade matrix ndikopindulitsa kupititsa patsogolo moyo wautumiki wa tsamba la macheka.
2.Chifukwa chiyani thupi la macheka liyenera kufanana ndi mwala wodula?
Njira zazikulu zakugawikana kwa miyala panthawi yodula macheka ndikuphwanya ndikuphwanya, komanso kumeta ubweya wambiri ndi kugawikana, kuwonjezeredwa ndi kugaya pamwamba.Daimondi yokhala ndi serrated yogwirira ntchito yomwe imakhala ngati chida chodulira.Mphepete mwake ndi malo a extrusion, malo odulidwa ali kutsogolo kwa m'mphepete, ndipo malo opera ali kumbuyo kumbuyo.Pansi pa kudula kothamanga kwambiri, tinthu tating'ono ta diamondi timagwira ntchito mothandizidwa ndi matrix.Panthawi yodula mwala, mbali imodzi, diamondi imapanga graphitization, kugawikana, ndi kutayika chifukwa cha kutentha kwakukulu kopangidwa ndi mikangano;Kumbali ina, matrix amavalidwa ndi kukangana ndi kukokoloka kwa miyala ndi ufa wa rock.Chifukwa chake, nkhani yosinthika pakati pa macheka ndi miyala ndiye nkhani yovala pakati pa diamondi ndi matrix.Maonekedwe a chida chomwe chimagwira ntchito bwino ndi chakuti kutayika kwa diamondi kumafanana ndi kuvala kwa matrix, kusunga diamondi kuti ikhale yokhazikika, yosasunthika nthawi isanakwane kapena kugaya diamondi yosalala komanso yoterera, kuwonetsetsa kuti kugaya kwake kukugwiritsidwa ntchito mokwanira. pakugwira ntchito, zomwe zimapangitsa kuti diamondi zambiri zikhale zosweka pang'ono komanso zotha.Ngati mphamvu ndi mphamvu yotsutsa ya diamondi yosankhidwa ndi yochepa kwambiri, idzatsogolera ku zochitika za "kumeta", ndipo moyo wa chida udzakhala wochepa ndipo passivation idzakhala yovuta, ndipo ngakhale kucheka sikungasunthe;Ngati mochulukira mkulu mphamvu abrasive particles amasankhidwa, kudula m'mphepete mwa abrasive particles adzaoneka flattened boma, chifukwa cha kuwonjezeka kudula mphamvu ndi kuchepa processing dzuwa.
(1) Pamene kuthamanga kwa matrix kumakhala kwakukulu kuposa kwa diamondi, kumabweretsa kudula kwa diamondi kwambiri komanso kuthamangitsidwa msanga.Kukana kuvala kwa thupi la macheka ndikotsika kwambiri, ndipo moyo wa macheka ndi waufupi.
(2) Liwiro la matrix likakhala locheperako kuposa la diamondi, diamondi yatsopanoyo siiwonekera mosavuta pambuyo poti m'mphepete mwa diamondi wavala, ma serrations alibe m'mphepete kapena m'mphepete mwake ndi wotsika kwambiri, pamwamba serrations ndi passivated, kudula liwiro ndi pang'onopang'ono, ndipo n'zosavuta kuti odulidwa bolodi kugwa, kukhudza khalidwe processing.
(3) Liwiro la kuvala la matrix likakhala lofanana ndi kuthamanga kwa diamondi, limawonetsa kugwirizana kwa matrix ndi mwala wodulidwa.
Nthawi yotumiza: Aug-11-2023