Txoj Kev Ntsuas Abrasive Hardness
Lub hardness ntawm abrasives feem ntau qhia los ntawm microhardness. Microhardness yog ib hom indentation hardness uas qhia txog lub peev xwm ntawm cov khoom nyob rau hauv kev sim los tiv thaiv qhov indentation ntawm lwm yam khoom nyuaj. Lub ntsuas ntsuas yog microhardness tester, uas yog qhov tseeb lub tshuab kuaj kab mob nrog cov khoom thauj khoom thiab lub qhov muag micrometer. Ua ntej kev ntsuas, lub abrasive yuav tsum tau ntsuas yog tsim rau hauv ib qho kev cuam tshuam disc qauv, uas tau muab tso rau ntawm theem ntawm lub microhardness tester, thiab lub quadrangular pob zeb diamond indenter yog pressurized los ntawm lub loading ntaus ntawv. Qhov loj ntawm cov khoom thauj tuaj yeem nce lossis txo raws li qhov hardness ntawm cov khoom yuav tsum tau ntsuas. Tom qab lub pob zeb diamond indenter yog nias rau hauv cov qauv, ib qho crater yog tsim rau saum npoo ntawm cov qauv. Teem lub tshuab hluav taws xob hla hlau ntawm lub qhov thiab ntsuas kab pheeb ces kaum ntev ntawm lub qhov nrog lub qhov muag micrometer. Raws li cov load thov thiab cov kab pheeb ces kaum ntev ntawm lub qhov, qhov microhardness tus nqi ntawm cov khoom ntsuas yuav raug xam.Four hom degree. Vim yog cov duab sib txawv ntawm cov pob zeb diamond indenter siv, microhardness ntxiv tau muab faib ua Vickers microhardness thiab Knoop microhardnessVickers microhardness yog cov khoom ntawm 130 degree pob zeb diamond tetrapyramid ua qhov indenter, tus nqi raug xam raws li cov qauv hauv qab no: HV=18 .18.P/d2Where: HV-Vickers hardness, Mpa; P- load, kq;d- pit kab pheeb ces kaum ntev, mm.Knoop hardness yog siv lub pob zeb diamond tetrapyramid nrog lub kaum sab xis ntawm 170 degree 30' thiab 130 degree raws li inputting lub taub hau, thiab nws tus nqi raug xam raws li cov qauv hauv qab no: HK-139.54-P/L2 formula: HK-Knoop hardness, Mpa; P-load, kg: L-pit diagonal length, mm, Tuam Tshoj thiab European lub teb chaws siv Vickers hardness, Tebchaws Asmeskas siv Knoop hardness. MPa yog qhov kev cai lij choj ntawm kev ntsuas rau microhardness, thaum kq / mm2 yog qhov feem ntau siv los ntawm kev suav hardness. Cov mis hloov pauv ntawm lawv yog 1kg/mm2=9.80665Mpa. Lub microhardness ntawm feem ntau siv abrasives yog raws li nram no.Variety Vickers Microhardness /Mpa(kg/mm2)Brown corundum 19 600-21 600 (2,000-2 200)White corundum 21 600~{25}} ( 2 200-2 300)E刚玉 21 600-22 600 (2 200~2 300)Single crystal corundum 21 600-23 500 ({31}})Microcrystalline corundum 19 600-21 600 ({ {33}})Bauxite sintered corundum 16700 (1700)Zirconium corundum 14 700 (1500) Pob zeb diamond 78 500 (8 000) Boron carbide 49 000 (5 000) Silicon Carbide 30 400-3 330 (3 100-3 400)Garnet 13 300 (1360) Quartz 8 000 (820)