Abrasive Hnav
Txawm hais tias qhov nyuaj ntawm cov chips lossis workpiece feem ntau qis dua li ntawm cov hniav, lawv feem ntau muaj cov khoom me me uas tuaj yeem khawb cov hniav saum npoo, ua rau muaj kev puas tsuaj.
Diffusion Hnav
Diffusion hnav tshwm sim ntawm qhov kub thiab txias. Piv txwv li, thaum txiav hard alloy steel, diffusion pib ntawm ib ncig ntawm 800 degree, ua rau cov tshuaj nyob rau hauv lub hard alloy kom sai sai diffuse mus rau hauv daim tawv nqaij thiab workpieces. Cov txheej txheem no decomposes WC (tungsten carbide) rau hauv W (tungsten) thiab C (carbon), uas tom qab ntawd diffuse rau hauv cov hlau. Yog li ntawd, ib qho tshwm sim ntawm tungsten carbide depletion tshwm sim ntawm cov hniav nto.
Oxidation Hnav
Oxidation hnav tshwm sim thaum txiav qhov kub txog 700-800 degree. Ntawm qhov kub no, cov pa oxygen hauv huab cua ua rau cov hlau nyob hauv cov hlau tsis muaj zog, xws li cobalt, tungsten carbide, thiab titanium carbide, tsim cov oxides softer (xws li, Co₃O₄, CoO, WO₃, TiO₂). Cov oxides no ces muab pov tseg los ntawm cov chips lossis workpieces, ua rau hnav. Cov txheej txheem no yog hu ua oxidation hnav.
Thermoelectric Hnav
Vim muaj cov khoom sib txawv ntawm cov khoom ua haujlwm, cov chips, thiab cov cuab yeej txiav, lub peev xwm thermoelectric yog tsim nyob rau hauv qhov chaw sib cuag thaum lub sij hawm txiav. Qhov no thermoelectric muaj peev xwm txhawb nqa kev nthuav dav, ua kom nrawm nrawm ntawm lub cuab yeej. Feem ntau, huab cua muaj teeb meem nkag mus rau thaj chaw sib cuag ntawm lub cuab yeej thiab cov chips, ua rau oxidation hnav ntau dua yuav tshwm sim raws cov thawj thiab theem nrab txiav.
