Tungsten Carbide

Lingaliro la simenti ya carbide: chinthu chophatikizika chopangidwa ndi zitsulo zamafuta zomwe zimakhala ndi chitsulo chosakanizira (gawo lolimba) ndi chitsulo chomangika (gawo lomangika).

Matrix a carbide opangidwa ndi simenti ali ndi magawo awiri: Gawo limodzi ndi gawo lolimba: Gawo lina ndi chitsulo chomangira.

Gawo lowumitsidwa ndi carbide yazitsulo zosinthika mu tebulo la periodic la zinthu, monga tungsten carbide, titanium carbide, tantalum carbide, zomwe zimakhala zolimba kwambiri komanso zimakhala ndi malo osungunuka oposa 2000 ℃, ena oposa 4000 ℃.Kuphatikiza apo, ma nitrides achitsulo, ma borides, ma silicides alinso ndi zinthu zofanana ndipo atha kugwiritsidwa ntchito ngati magawo owumitsa mu carbide yomangidwa.Kukhalapo kwa gawo lowumitsidwa kumatsimikizira kuuma kwakukulu kwambiri komanso kuvala kukana kwa alloy.

Zitsulo zomangira nthawi zambiri zimakhala zitsulo zamagulu achitsulo, nthawi zambiri cobalt ndi faifi tambala.Pakupanga simenti carbide, zopangira ufa amasankhidwa ndi tinthu kukula pakati 1 ndi 2 microns ndi mkulu mlingo wa chiyero.Zopangirazo zimayikidwa molingana ndi chiŵerengero chokhazikitsidwa, zomwe zimawonjezeredwa ku mowa kapena zofalitsa zina mu mphero yonyowa, kugaya chonyowa, kuti zikhale zosakanikirana, zophwanyidwa, zouma, zosefedwa ndikuwonjezeredwa ku sera kapena chingamu ndi mitundu ina ya akamaumba. wothandizira, ndiyeno zouma, sieved ndi kupanga osakaniza.Kenako kusakaniza kumapangidwa ndi granulated, kukanikizidwa, ndi kutenthedwa mpaka pafupi ndi malo osungunuka a zitsulo zomangika (1300 ~ 1500 ℃), gawo lolimba ndi zitsulo zomangika zidzapanga alloy eutectic.Pambuyo pozizira, gawo lowumitsidwa limagawidwa mu lattice lopangidwa ndi zitsulo zomangika ndipo zimagwirizanitsidwa kwambiri kuti zikhale zolimba.Kuuma kwa simenti carbide zimadalira kuuma gawo zili ndi kukula kwa tirigu, mwachitsanzo apamwamba oumitsa gawo okhutira ndi bwino kukula kwa tirigu, kukulirapo kuuma.Kulimba kwa carbide ya simenti kumatsimikiziridwa ndi zitsulo zomangira, ndipo zitsulo zomangira zimakwera, mphamvu yopindika imakulirakulira.

Makhalidwe abwino a simenti ya carbide:
1) High kuuma, mkulu kuvala kukana
2) High modulus ya elasticity
3) Mkulu compressive mphamvu
4) Kukhazikika kwamankhwala abwino (asidi, alkali, kukana kutentha kwa okosijeni)
5) Kulimba kwamphamvu kochepa
6) Low coefficient of kukulitsa, matenthedwe ndi magetsi madutsidwe ofanana ndi chitsulo ndi ma aloyi ake

Mapulogalamu opangidwa ndi simenti ya carbide: zida zamakono zamakono, kuvala zinthu zosagwira, kutentha kwakukulu ndi zipangizo zosagwirizana ndi dzimbiri.

Ubwino wa zida za carbide (poyerekeza ndi chitsulo cha alloy):
1) Mwachidziwitso, kangapo kapena kangapo kuti musinthe moyo wa zida.
Chitsulo kudula chida moyo akhoza ziwonjezeke ndi 5-80 nthawi, gage moyo chinawonjezeka ndi 20-150 zina, nkhungu moyo chinawonjezeka ndi 50-100 zina.
2) Wonjezerani zitsulo kudula liwiro ndi kutumphuka pobowola liwiro exponentially ndi makumi nthawi.
3) Sinthani kulondola kwa mawonekedwe ndi kumaliza kwapamwamba kwa magawo opangidwa ndi makina.
4) N'zotheka kukonza zinthu zovuta kumakina monga alloy yosagwira kutentha, alloy effect ndi chitsulo chowonjezera cholimba, chomwe chimakhala chovuta kuchikonza ndi chitsulo chothamanga kwambiri.
5) Itha kupanga zida zina zosagwirizana ndi dzimbiri kapena kutentha kwambiri, motero zimathandizira kulondola komanso moyo wa makina ndi zida zina.

Gulu la Cemented Carbide:
1. WC-Co (tungsten drill) mtundu wa aloyi: wopangidwa ndi tungsten carbide ndi cobalt.Nthawi zina mu chida chodulira (nthawi zinanso mu chida chotsogolera) onjezerani 2% kapena kuchepera kwa carbide ina (tantalum carbide, niobium carbide, vanadium carbide, etc.) monga zowonjezera.High cobalt: 20-30%, sing'anga cobalt: 10-15%, otsika cobalt: 3-8%
2. WC-TiC-Co (tungsten-iron-cobalt) -mtundu wa aloyi.
Low titaniyamu aloyi: 4-6% TiC, 9-15% Co
Aloyi Yapakatikati: 10-20% TiC, 6-8% Co
Mkulu wa titaniyamu: 25-40% TiC, 4-6% Co
3.WC-TiC-TaC(NbC)-Co aloyi.
Aloyi ya WC-TiC-Co imakhala ndi kukana kutentha kwambiri kwa okosijeni komanso kusokonezeka kwamphamvu kwamafuta, motero nthawi zambiri imakhala ndi zida zapamwamba kwambiri.TiC:5-15%, TaC(NbC):2-10%, Co:5-15%, yotsalayo ndi WC.
4. Carbide yopangidwa ndi zitsulo: yopangidwa ndi tungsten carbide kapena titaniyamu carbide ndi carbon steel kapena alloy steel.
5. Titanium carbide based alloy: yopangidwa ndi carbon kuposa titaniyamu, chitsulo cha nickel ndi molybdenum metal kapena molybdenum carbide (MoC).Chiwerengero chonse cha nickel ndi molybdenum nthawi zambiri chimakhala 20-30%.

Carbide angagwiritsidwe ntchito kupanga rotary burr, CNC masamba, mphero odula, mipeni zozungulira, mipeni slitting, matabwa, masamba macheka, ndodo carbide, etc.