Kuyerekeza kwa Silicon carbide ceramic polding process: njira yopangira sintering ndi zabwino zake ndi zovuta zake

Silicon carbide ceramickuumba ndondomeko kuyerekeza: sintering ndondomeko ndi ubwino wake ndi kuipa

Popanga silicon carbide ceramics, kupanga ndi ulalo umodzi wokha munjira yonseyi. Sintering ndiye njira yayikulu yomwe imakhudza mwachindunji magwiridwe antchito ndi magwiridwe antchito a ceramic. Pali njira zambiri zopangira sintering silicon carbide ceramics, iliyonse ili ndi zabwino zake ndi zovuta zake. Mu positi iyi yabulogu, tiwona momwe sintering ya silicon carbide ceramics ndikuyerekeza njira zosiyanasiyana.

1. Kuyankha sintering:
Reaction sintering ndi njira yotchuka yopangira zida za silicon carbide ceramics. Iyi ndi njira yosavuta komanso yotsika mtengo pafupi ndi net-to-size process. Sintering imatheka ndi silicidation reaction pa kutentha otsika 1450 ~ 1600 ° C ndi nthawi yochepa. Njirayi imatha kutulutsa magawo akulu akulu ndi mawonekedwe ovuta. Komabe, ilinso ndi kuipa kwake. Kuchita kwa siliconizing mosakayikira kumabweretsa 8% ~ 12% ya silicon yaulere mu silicon carbide, yomwe imachepetsa kutentha kwake kwamakina, kukana kwa dzimbiri, komanso kukana makutidwe ndi okosijeni. Ndipo kutentha kwa ntchito kumakhala kochepa pansi pa 1350 ° C.

2. Kukanikiza kotentha:
Kuthirira kotentha ndi njira ina yodziwika bwino yopangira sintering silicon carbide ceramics. Mwanjira iyi, ufa wowuma wa silicon carbide umadzazidwa mu nkhungu ndikutenthedwa pamene ukugwiritsa ntchito kukakamizidwa kuchokera ku uniaxial direction. Kutentha ndi kupanikizika panthawi imodzi kumalimbikitsa kufalikira kwa tinthu, kutuluka, ndi kusuntha kwakukulu, zomwe zimapangitsa kuti silicon carbide ceramics yokhala ndi njere zabwino, kachulukidwe kwambiri, komanso makina abwino kwambiri. Komabe, hot pressing sintering ilinso ndi zovuta zake. Njirayi ndi yovuta kwambiri ndipo imafuna zipangizo zamakono za nkhungu ndi zipangizo. Kuchita bwino kwa kupanga kumakhala kochepa komanso mtengo wake ndi wokwera. Kuonjezera apo, njirayi ndi yoyenera kwa mankhwala omwe ali ndi mawonekedwe osavuta.

3. Hot isostatic kukanikiza sintering:
Hot isostatic pressing (HIP) sintering ndi njira yophatikizira kutentha kwambiri komanso mpweya wothamanga kwambiri wa isotropically. Amagwiritsidwa ntchito ngati sintering ndi kachulukidwe wa silicon carbide ceramic ufa, thupi lobiriwira kapena pre-sintered thupi. Ngakhale kuti HIP sintering imatha kusintha magwiridwe antchito a silicon carbide ceramics, simagwiritsidwa ntchito kwambiri popanga misa chifukwa chazovuta komanso kukwera mtengo.

4. Kuyimba mopanda kukakamizidwa:
Pressureless sintering ndi njira yokhala ndi kutentha kwambiri, njira yosavuta yopangira sintering komanso mtengo wotsika wa silicon carbide ceramics. Imalolezanso njira zingapo zopangira, ndikupangitsa kuti ikhale yoyenera mawonekedwe ovuta komanso magawo okhuthala. Njirayi ndiyoyenera kwambiri kupanga mafakitale akuluakulu a silicon ceramics.

Mwachidule, njira yopangira sintering ndi gawo lofunikira kwambiri popanga zoumba za SiC. Kusankhidwa kwa njira yopangira sintering kumatengera zinthu monga zomwe zimafunidwa za ceramic, zovuta za mawonekedwe, mtengo wopanga komanso magwiridwe antchito. Njira iliyonse ili ndi ubwino ndi zovuta zake, ndipo ndikofunika kuganizira mozama zinthu izi kuti mudziwe njira yabwino kwambiri yopangira sintering pa ntchito inayake.