Simenti Carbide Sintered Zinyalala Ndi Kusanthula Zifukwa

Cemented carbide ndi ufa wazitsulo wopangidwa mu ng'anjo ya vacuum kapena ng'anjo yochepetsera haidrojeni yokhala ndi cobalt, faifi tambala, ndi molybdenum monga chigawo chachikulu cha tungsten carbide micron-kakulidwe ufa wa high-hardness refractory chitsulo.Sintering ndi gawo lofunikira kwambiri mu carbide yopangidwa ndi simenti.Zomwe zimatchedwa sintering ndikuwotcha ufa wophatikizika ku kutentha kwina, kuusunga kwa nthawi inayake, ndiyeno kuziziritsa kuti mupeze zinthu zomwe zili ndi zofunikira.Njira ya sintering ya simenti ya carbide ndi yovuta kwambiri, ndipo n'zosavuta kutulutsa zinyalala za sintered ngati simusamala.Lero, Chuangrui Xiaobian akugawana nanu zinyalala wamba komanso zifukwa zake.

1. Carbide sintered zinyalala ndizoyamba kusenda
Izi zikutanthauza kuti, pamwamba pa carbide yopangidwa ndi simenti imadutsa m'mphepete mwa ming'alu, zipolopolo zowonongeka kapena ming'alu, ndipo nthawi zambiri, zikopa zazing'ono zopyapyala ngati mamba a nsomba, ming'alu yophulika, ngakhale pulverization.Kupukuta kumachitika makamaka chifukwa cha kukhudzana kwa cobalt mu compact, kotero kuti mpweya wokhala ndi mpweya uwola mpweya waulere mmenemo, zomwe zimapangitsa kuchepa kwa mphamvu yam'deralo ya compact, zomwe zimapangitsa kuti peeling.

2. Chachiwiri chodziwika bwino cha sintered carbide sintered ndi mabowo
Pores pamwamba 40 microns amatchedwa pores.Zinthu zomwe zingayambitse matuza zimatha kupanga pores.Kuonjezera apo, pamene pali zonyansa mu thupi la sintered zomwe sizimanyowetsedwa ndi zitsulo zosungunuka, monga pores zazikulu monga "zopanda pake", kapena thupi la sintered lili ndi gawo lalikulu lolimba ndipo Kusiyanitsa kwa gawo lamadzimadzi kungapangitse pores.

3. Chinthu chachitatu chodziwika bwino cha simenti ya carbide sintered ndi chithuza
Pali mabowo muzopangidwa ndi simenti ya carbide alloy, ndipo mawonekedwe opindika amawoneka pamwamba pazigawo zofananira.Chodabwitsa ichi chimatchedwa matuza.Chifukwa chachikulu cha matuza ndi chakuti thupi la sintered lili ndi mpweya wochuluka kwambiri.Nthawi zambiri pali mitundu iwiri: imodzi ndi yakuti mpweya umalowa m'thupi la sintered, ndipo panthawi ya sintering shrinkage, mpweya umayenda kuchokera mkati kupita pamwamba.Ngati pali zonyansa za kukula kwake m'thupi lopindika, monga zotsalira za alloy, zitsulo zachitsulo, ndi zotsalira za cobalt, mpweya umakhala pano.Pambuyo pa thupi la sintered likuwonekera mu gawo lamadzimadzi ndipo limakhala lolimba, mpweya sungathe kutulutsidwa.Matuza amapanga pamalo ang'onoang'ono.

Chachiwiri ndi chakuti pali mankhwala omwe amapanga mpweya wambiri m'thupi la sintered.Pamene pali oxides mu sintered thupi, iwo yafupika pambuyo madzi gawo akuwoneka kupanga mpweya, zomwe zidzapangitsa mankhwala kuwira;Ma aloyi a WC-CO nthawi zambiri amakhala opangidwa ndi Kuyambitsidwa ndi kusakanikirana kwa ma oxides mu kusakaniza.

4. Palinso bungwe losagwirizana: kusakaniza

5, ndiyeno pali deformation
Kusintha kosakhazikika kwa thupi la sintered kumatchedwa deformation.Zifukwa zazikulu zowonongeka ndi izi: kugawidwa kwa kachulukidwe ka compacts si yunifolomu, chifukwa kachulukidwe ka alloy yomalizidwa ndi ofanana;thupi la sintered likusowa kwambiri mu carbon kwanuko, chifukwa kusowa kwa carbon kumachepetsa gawo lamadzimadzi;kukweza bwato sikumveka;mbale yakumbuyo ndi yosiyana.