Yanshan University tau ua tiav qhov tseem ceeb hauv kev tshawb fawb ntawm graphite / pob zeb diamond theem hloov

Tsis ntev los no, Zhao Zhisheng thiab lwm tus los ntawm Lub Xeev Lub Chaw Haujlwm Tseem Ceeb ntawm Metastable Materials Preparation Technology thiab Science ntawm Yanshan University, kws tshaj lij Tian Yongjun, thiab lwm tus tau koom tes nrog cov kws tshawb fawb hauv tsev thiab txawv teb chaws los qhia meej txog qhov teeb meem ntawm kev hloov pauv ncaj qha los ntawm graphite mus rau pob zeb diamond nyob rau hauv kev kub ntxhov siab. , uas tau plagued lub zej zog scientific rau ntau tshaj li ib nrab xyoo pua. , thiab nrhiav tau ib chav kawm tshiab ntawm hybrid carbon cov ntaub ntawv nrog kev sib xyaw ua ke zoo heev. Cov txiaj ntsig kev tshawb fawb, hu ua "Coherent interfaces tswj kev hloov pauv ncaj qha los ntawm graphite mus rau pob zeb diamond", tau luam tawm online hauv Xwm thaum Lub Xya Hli 6, 2022.

 

Daim ntawv txuas: https://www.nature.com/articles/s41586-022-04863-2.

 

Graphite thiab pob zeb diamond yog cov khoom siv carbon ntau tshaj plaws hauv qhov xwm txheej. Kev hloov pauv ncaj qha los ntawm graphite mus rau pob zeb diamond feem ntau yog ua nyob rau hauv "lub thawv dub" ntawm qhov kub thiab txias, thiab cov txheej txheem ntawm kev hloov pauv tau sib cav heev. Pab pawg tshawb fawb Yanshan University tau soj ntsuam thiab txiav txim siab cov qauv sib txuas sib txuas ntawm graphite thiab pob zeb diamond thawj zaug hauv cov qauv graphite uas dhau los ntawm ib nrab ntawm kev hloov pauv nyob rau hauv qhov kub siab zoo li qub, thiab tom qab ntawd qhia meej txog graphite / pob zeb diamond theem hloov pauv hauv qab static siab: lub graphite txheej dhau los ntawm ob hom pob zeb diamond Cov qauv txheej txheem thiab ob lub duab plaub lub ntsiab lus yog nyob rau hauv kev sib koom ua ke los tsim ib qho kev sib txuas, thiab kev hloov ntawm graphite mus rau pob zeb diamond yog pom tau los ntawm kev nce qib ntawm kev sib txuas mus rau thaj tsam graphite. Cov kev sib txawv ntawm cov khoom sib txawv tsim ntau yam kev sib txuas ntawm cov qauv sib txuas, ua rau muaj ntau yam kev sib txuas (stacking faults, ntxaib, pob zeb diamond polymorphs, thiab lwm yam) nyob rau hauv lub pob zeb diamond theem hloov cheeb tsam. Qhov kev hloov pauv tshiab no yog qhov sib txawv ntawm cov qauv nucleation kev loj hlob thiab kev sib koom tes shear mechanism, thiab tej zaum yuav siv tau rau cov txheej txheem ntawm cov txheej txheem ntawm cov khoom sib hloov ntawm lwm cov ntaub ntawv covalent, xws li IVA cov khoom yooj yim, IIIA-VA compounds, thiab lwm yam.

 

Pab pawg tshawb fawb hu ua hom hybrid carbon cov khoom siv nrog graphite / pob zeb diamond coherent interface Gradia. Gradia muaj kev sib xyaw ua ke zoo heev ntawm cov khoom siv kho tshuab thiab cov khoom siv hluav taws xob: Knoop hardness yog adjustable ntawm 51-115Gpa; chav kub resistivity yog adjustable ntawm 8'10-4-4.9´105Ω m; fracture toughness yog siab heev, thiab tsis tuaj yeem ntsuas tau siv cov qauv indentation. Gradia muab cov txiaj ntsig kev ua tau zoo ntawm graphite thiab pob zeb diamond, thiab nws qhov kev ua tau zoo tuaj yeem hloov kho ntxiv los ntawm kev hloov qhov piv ntawm graphite thiab pob zeb diamond. Nws yog lub cim tshiab ntawm cov khoom siv roj carbon zoo uas paub txog kev sib xyaw ntawm hluav taws xob conductivity / superhardness, huab toughness / ultrahardness thiab lwm yam khoom zoo.

 

Lub graphite/pob zeb diamond ncaj qha kev hloov pauv txheej txheem qhia los ntawm kev tshawb fawb ua kom cov khoom hloov pauv hloov pauv hloov pauv, thiab cov ntaub ntawv tshawb pom tshiab hybrid carbon muab kev tshoov siab rau kev txhim kho cov ntaub ntawv tshiab. Cov txiaj ntsig kev tshawb fawb tau thov rau kev tsim patents hauv Suav teb, Tebchaws Meskas, Nyiv, thiab Europe. Kev ua haujlwm theoretical yav dhau los kwv yees tias hom qauv hybrid no tuaj yeem muaj nyob ruaj khov tau luam tawm hauv Chin. Phys. Lett. 38, 028102 (2021); Chin. Phys. Lett. 39, 036301 (2022); Mater. Hnub no Phys. 23, 100630 (2022).

 

Txoj haujlwm no tau txais kev txhawb nqa los ntawm National Natural Science Foundation ntawm Tuam Tshoj (52090020, 91963203, 51772260, U20A20238, thiab lwm yam), National Key Research and Development Program (2018YFA0703400, 2018YFA0305900), thiab lub koom haum Hebei 20 (2018) Kev Tshawb Fawb Txog Kev Tshawb Fawb 2018. . Cov kws sau ntawv thawj zaug yog Luo Kun, Liu Bing, Hu Wentao thiab Dong Xiao, thiab tus kws sau ntawv yog xibfwb Zhao Zhisheng.