High-temperature Thiab High-pressure Synthesis Ntawm Boron Nitride
May 02, 2021
Xyoo 1957, Wentorf hluavtaws sau lo lus BN rau thawj zaug. Thaum qhov kub nyob ze rau lossis siab dua 1700 ° C thiab qhov siab tsawg kawg nkaus yog 11-12 GPa, ntshiab hexagonal boron nitride (HBN) yog ncaj qha hloov mus rau hauv cubic boron nitride (CBN). Tom qab, nws tau pom tias kev siv cov catalysts tuaj yeem txo qis kev hloov pauv ntawm qhov kub thiab siab. Cov catalysts siv feem ntau yog: alkali thiab alkaline ntiaj teb hlau, alkali thiab alkaline av nitrides, alkaline fluoronitrides, alkaline fluoronitrides, ammonium borate thiab fluoride inorganic. Ntawm lawv, qhov kub thiab lub siab xav tau rau ammonium borate raws li cov catalyst yog qhov qis tshaj. Qhov siab xav tau yog 5GPa ntawm 1500 ℃, thiab qhov kub thiab txias yog 600 ～ 700 ℃ thaum lub siab yog 6GPa. Nws tuaj yeem pom tau tias txawm hais tias qhov sib ntxiv ntawm cov catalyst tuaj yeem txo qis kev hloov pauv ntawm qhov ntsuas kub thiab lub siab, qhov xav tau qhov kub thiab lub siab tseem tseem siab. Yog li ntawd, nws cov khoom siv npaj tau yog qhov nyuaj thiab tsis kim, thiab nws daim ntawv thov kev lag luam raug txwv.