Terminology ntawm hard alloy (1)

Txhawm rau txhawb kev nkag siab ntawm cov lus ceeb toom thiab kev sau ntawv txog kev siv tawv tawv, ua qauv rau cov ntsiab lus, thiab piav qhia lub ntsiab lus ntawm cov ntsiab lus hauv cov khoom, peb nyob ntawm no los kawm cov ntsiab lus ntawm cov tawv tawv.

Tungsten Carbide

Tungsten carbide yog hais txog sintered composites uas muaj refractory hlau carbides thiab hlau binders. Ntawm cov hlau carbides tam sim no siv, tungsten carbide (WC), titanium carbide (TiC), thiab tantalum carbide (TaC) yog cov khoom siv feem ntau. Cobalt hlau yog dav siv nyob rau hauv cemented carbide ntau lawm ua ib tug binder. Rau qee qhov tshwj xeeb daim ntawv thov, hlau binders xws li npib tsib xee (Ni) thiab hlau (Fe) kuj siv tau.

Qhov ntom

Qhov ntom yog hais txog qhov loj-rau-ntim piv ntawm cov khoom, uas tseem hu ua lub ntiajteb txawj nqus tshwj xeeb. Nws lub ntim kuj muaj qhov ntim ntawm qhov pores hauv cov khoom. Tungsten carbide (WC) muaj qhov ceev ntawm 15.7 g / cm³ thiab cobalt (Co) muaj qhov ceev ntawm 8.9 g / cm³. Yog li ntawd, raws li cobalt (Co) cov ntsiab lus nyob rau hauv tungsten-cobalt alloys (WC-Co) txo, tag nrho cov ceev yuav nce. Txawm hais tias qhov ceev ntawm titanium carbide (TiC) tsawg dua li ntawm tungsten carbide, nws tsuas yog 4.9 g / cm3. Yog tias TiC los yog lwm cov khoom siv tsawg dua ntxiv, qhov ntom ntom yuav txo qis. Nrog qee cov tshuaj muaj pes tsawg leeg ntawm cov khoom, qhov nce hauv qhov pores hauv cov khoom ua rau txo qis qhov ntom.

Hardness

Hardness yog hais txog lub peev xwm ntawm cov khoom siv los tiv thaiv cov yas deformation.

Vickers hardness (HV) yog dav siv thoob ntiaj teb. Qhov kev ntsuas hardness no yog hais txog tus nqi hardness tau los ntawm kev siv pob zeb diamond los nkag rau saum npoo ntawm cov qauv los ntsuas qhov loj ntawm indentation nyob rau hauv ib qho kev thauj khoom. Rockwell hardness (HRA) yog lwm txoj kev ntsuas hardness. Nws siv qhov tob tob ntawm tus qauv pob zeb diamond cone los ntsuas hardness. Ob leeg Vickers hardness thiab Rockwell hardness tuaj yeem siv rau kev ntsuas hardness ntawm cemented carbide, thiab ob leeg tuaj yeem hloov mus rau ib leeg.

Khoov zog

Bending zog tseem hu ua transverse breaking zog los yog flexural zog. Lub zog alloys tau ntxiv raws li ib qho yooj yim txhawb nqa beam ntawm ob pivots, thiab ces ib tug load yog siv rau lub centerline ntawm ob qho tib si pivots kom txog rau thaum lub hard alloy ruptures. Cov txiaj ntsig suav los ntawm cov qauv winding yog siv rau cov khoom thauj uas yuav tsum tau ua kom tawg, thiab qhov chaw hla ntu ntawm cov qauv. Hauv tungsten-cobalt alloys (WC-Co), lub zog flexural nce nrog cobalt (Co) cov ntsiab lus hauv tungsten-cobalt alloys, tab sis lub zog flexural ncav cuag qhov siab tshaj plaws thaum cov ntsiab lus cobalt (Co) nce txog 15%. Flexural zog yog ntsuas los ntawm qhov nruab nrab ntau qhov ntsuas. Tus nqi no kuj tseem yuav txawv nrog cov geometry ntawm cov qauv, qhov chaw nyob (smoothness), kev ntxhov siab sab hauv, thiab qhov tsis xws ntawm cov khoom. Yog li ntawd, lub zog flexural tsuas yog ib qho kev ntsuas ntawm lub zog, thiab lub zog flexural tsis tuaj yeem siv los ua lub hauv paus rau kev xaiv cov khoom.

Porosity

Cemented carbide yog tsim los ntawm hmoov metallurgy txheej txheem los ntawm nias thiab sintering. Vim qhov xwm txheej ntawm txoj kev, cov kab ntawm porosity yuav nyob twj ywm hauv cov qauv hlau ntawm cov khoom.

Qhov txo qis hauv porosity tuaj yeem txhim kho kev ua haujlwm tag nrho ntawm cov khoom. Cov txheej txheem sintering siab yog ib txoj hauv kev zoo los txo qhov porosity.