Njira yopanga chida cha cubic boron nitride (CBN).

1. Njira yoyeretsera zipangizo

Chifukwa WBN, HBN, pyrophyllite, graphite, magnesium, chitsulo ndi zonyansa zina zimakhalabe mu ufa wa CBN;Komanso, izo ndi binder ufa muli adsorbed mpweya, nthunzi madzi, etc., amene si yabwino kwa sintering.Choncho, njira yoyeretsera zinthu zopangira ndi imodzi mwamalumikizidwe ofunikira kuti atsimikizire kuti ma polycrystals opangidwa.Pachitukuko, tinagwiritsa ntchito njira zotsatirazi kuyeretsa CBN micropowder ndi zinthu zomangiriza: choyamba, perekani ufa wa CBN ufa ndi NaOH pafupifupi 300C kuchotsa pyrophyllite ndi HBN;Ndiye wiritsani perchloric asidi kuchotsa graphite;Pomaliza, gwiritsani ntchito HCl kuwiritsa pa mbale yotenthetsera yamagetsi kuti muchotse chitsulocho, ndikutsuka kuti musalowerere ndi madzi osungunuka.Co, Ni, Al, ndi zina zomwe zimagwiritsidwa ntchito polumikizana zimathandizidwa ndi kuchepetsa haidrojeni.Ndiye CBN ndi binder zimasakanizidwa mofanana molingana ndi gawo lina ndikuwonjezera mu nkhungu ya graphite, ndikutumiza mu ng'anjo yowonongeka ndi kuthamanga kosachepera 1E2, kutenthedwa pa 800 ~ 1000 ° C kwa 1h kuchotsa dothi, okosijeni wa adsorbed. ndi nthunzi wamadzi pamwamba pake, kotero kuti CBN njere pamwamba ndi woyera kwambiri.

Pankhani ya kusankha ndi kuwonjezera zida zomangira, mitundu ya othandizira omwe amagwiritsidwa ntchito pano mu CBN polycrystals atha kufotokozedwa mwachidule m'magulu atatu:

(1) Zomangira zitsulo, monga Ti, Co, Ni.Cu, Cr, W ndi zitsulo zina kapena ma alloys, ndizosavuta kufewetsa pa kutentha kwakukulu, zomwe zimakhudza moyo wa zida;

(2) Ceramic chomangira, monga Al2O3, kugonjetsedwa ndi kutentha kwambiri, koma ali osauka amakhudza toughness, ndi chida n'zosavuta kugwa ndi kuwonongeka;

(3) Cermet chomangira, monga njira yolimba yopangidwa ndi carbides, nitrides, borides ndi Co, Ni, etc., imathetsa zofooka za mitundu iwiriyi ya mgwirizano.Kuchuluka kwa binder kudzakhala kokwanira koma osati mopitirira muyeso.Zotsatira zoyesera zikuwonetsa kuti kukana kuvala ndi kupindika kwa mphamvu ya polycrystal imagwirizana kwambiri ndi njira yaulere yaulere (kukhuthala kwa gawo lolumikizana), pomwe njira yaulere ndi 0.8 ~ 1.2 μ M, chiŵerengero cha kuvala kwa polycrystalline ndichokwera kwambiri, ndipo kuchuluka kwa binder ndi 10% ~ 15% (chiwerengero cha misa).

2. Kiyubiki boron nitride (CBN) chida mluza akhoza kugawidwa m'magulu awiri
Chimodzi ndikuyika chisakanizo cha CBN ndi chomangira cholumikizira ndi simenti ya carbide matrix mu kapu ya molybdenum yolekanitsidwa ndi wosanjikiza wotchinga wa carbon chubu.

Chinacho ndikuchiyika mwachindunji chodulira cha polycrystalline CBN chodulira chopanda aloyi gawo lapansi: kutengera chosindikizira chambali zisanu ndi chimodzi, ndikugwiritsa ntchito chotenthetsera cham'mbali chowotcha.Sonkhanitsani ufa wawung'ono wa CBN wosakanikirana, muugwire kwakanthawi pang'onopang'ono ndikukhazikika, kenako ndikuutsitsa pang'onopang'ono mpaka kutentha pang'ono kenako ndikutsitsa pang'onopang'ono mpaka kukakamiza kwanthawi zonse.Polycrystalline CBN mpeni mluza wapangidwa

3. Magawo a geometric a chida cha cubic boron nitride (CBN).

Moyo wautumiki wa chida cha cubic boron nitride (CBN) umagwirizana kwambiri ndi magawo ake a geometric.Makona oyenerera kutsogolo ndi kumbuyo amatha kusintha kukana kwa chida.Chip kuchotsa mphamvu ndi kutentha dissipation mphamvu.Kukula kwa kangaude ngodya kumakhudzanso kupsinjika kwa m'mphepete komanso kupsinjika kwamkati kwa tsamba.Pofuna kupewa kupsinjika kwakukulu komwe kumachitika chifukwa cha kukhudzidwa kwamakina pachida, mbali yoyipa yakutsogolo (- 5 ° ~ - 10 °) nthawi zambiri imatengedwa.Panthawi imodzimodziyo, pofuna kuchepetsa kuvala kwa mbali yakumbuyo, ma angles akuluakulu ndi othandizira kumbuyo ndi 6 °, utali wa nsonga ya chida ndi 0.4 - 1.2 mm, ndipo chamfer ndi yosalala.

4. Kuyang'ana zida za cubic boron nitride (CBN).
Kuphatikiza pa kuyesa index of hardness, mphamvu yopindika, kulimba kwamphamvu ndi zinthu zina zakuthupi, ndikofunikira kugwiritsa ntchito maikulosikopu yamagetsi yamphamvu kwambiri kuti muwone kulondola kwamankhwala amtundu uliwonse.Chotsatira ndikuwunika kwa gawo, kulondola kwa kukula, mtengo wa M, kulolerana kwazithunzi, kuuma kwa chida, kenako kulongedza ndi kusunga.