Thaum muas graphite daim hlau, yeej ib txwm muaj kev txhawj xeeb tias cov khoom graphite yuav tawg lossis tawg thaum thauj khoom. Hauv kev muaj tiag, qee cov khoom ua tiav graphite yog nkig, thaum lwm tus tsis yog. Yog li ntawd, ceev faj tuav yog ib qho tseem ceeb thaum lub sij hawm thauj khoom, xws li siv cov npuas npuas los tiv thaiv cov khoom puas.
Yog li, puas graphite phaj nkig lossis tawv?
Ntshiab graphite tuaj yeem suav hais tias nyuaj; qhov siab dua qhov ceev ntawm graphite, qhov nyuaj nws yog. Txawm li cas los xij, kev tshawb fawb, graphite tau piav qhia tias yog mos heev. Graphite yog tsim los ntawm cov pa roj carbon, thiab cov pa roj carbon kuj tuaj yeem tsim cov pob zeb diamond nyuaj heev. Qhov kev piav qhia no tuaj yeem ua rau tsis meej pem rau cov tsis paub nrog graphite.
Qhov tseeb, tsis muaj qhov sib txawv. Graphite yog ua los ntawm carbon, thiab pob zeb diamond kuj yog ua los ntawm carbon. Lub hardness yog piv rau cov hlau thiab hlau. Yog li, lub hardness xa mus tsis yog hom hardness zoo li pob zeb; nws hais txog qhov hardness ntawm cov khoom siv graphite. Txawm li cas los xij, graphite kuj yog mos heev; Nws tuaj yeem siv tau zoo li tus cwj mem sau rau ntawm daim ntawv thiab tuaj yeem ua tau yooj yim milled. Tsis zoo li hlau thiab hlau, siab - purity graphite tuaj yeem txiav tau yooj yim thiab milled nrog cov cuab yeej siv tshuab zoo tib yam thiab cov cuab yeej txiav.
Tsis txhob xav tias vim nws yooj yim milled, graphite tsis nyuaj. Nyob rau hauv qhov tseeb, lub inherent hardness ntawm graphite ua rau ib tug tseem ceeb hnav ntawm milling thiab txiav cov cuab yeej. Yog li ntawd, siab - purity graphite yog qhov nyuaj, nkig, thiab kuj muaj toughness. Brittleness thiab toughness zoo li contradictory, tab sis lawv tsis yog. Brittleness txhais tau tias graphite so thiab chips yooj yim, thaum toughness hais txog nws elasticity. Piv txwv li, ib qho me me ntawm graphite tuaj yeem khoov rau hauv ib qho arc los ntawm kev quab yuam sab nraud, thiab thaum lub zog tawm, cov graphite rov qab mus rau nws qhov qub yam tsis muaj deformation. Txawm li cas los xij, yog tias lub zog muaj zog heev, nws yuav tawg tau yooj yim. Yog li, los ntawm qhov piv txwv no, nws yog qhov tseeb tias graphite yog ob qho tib si tawv thiab tawv tsis yog qhov sib txawv.