Svart k\u00edsilk\u00edsilkarb\u00ed\u00f0 er unni\u00f0 samkv\u00e6mt n\u00e1kv\u00e6mum forskriftum. N\u00e1kv\u00e6m st\u00e6r\u00f0ar- og kornlagaeftirlit tryggir samr\u00e6mda \u00e1fer\u00f0. K\u00edsilk\u00edsilkarb\u00ed\u00f0duft er f\u00e1anlegt \u00ed nokkrum sl\u00edpigr\u00f3\u00f0ursst\u00e6r\u00f0um og \u00ed magni fimm, t\u00edu e\u00f0a tuttugu og fimm punda. St\u00e6rri magn m\u00e1 panta eftir bei\u00f0ni. \u00dea\u00f0 er miki\u00f0 nota\u00f0 \u00ed \u00fer\u00fdstiblystri. Lestu \u00e1fram til a\u00f0 f\u00e1 n\u00e1nari uppl\u00fdsingar. \u00de\u00fa getur einnig fr\u00e6\u00f0st n\u00e1nar um eiginleika og framlei\u00f0slu k\u00edsilk\u00edsilkarb\u00ed\u00f0dufts.<\/p>\n
St\u00e6r\u00f0ardreifingar k\u00edsilkarb\u00ed\u00f0dufts<\/p>\n
\u00cd \u00feessari grein er greint fr\u00e1 st\u00e6r\u00f0ardreifingu k\u00edsilk\u00edsilsdufts. \u00deetta efni var framleitt me\u00f0 slitm\u00f6lun. Kornast\u00e6r\u00f0 lokaefnisins var 37 nm. \u00deetta efni var s\u00ed\u00f0an pressulaus brennt me\u00f0 \u00fev\u00ed a\u00f0 b\u00e6ta vi\u00f0 kolefni og b\u00f3rk\u00edsli vi\u00f0 2050 \u00b0C. St\u00e6r\u00f0ardreifingkornanna var \u00e1kv\u00f6r\u00f0u\u00f0 me\u00f0 gegnumgeislat\u00f6lvusj\u00f3nauka (TEM).<\/p>\n
St\u00e6r\u00f0ardreifing SiC-dufts hefur \u00e1hrif \u00e1 \u00fdmsar vinnslua\u00f0fer\u00f0ir, \u00fear \u00e1 me\u00f0al kristalv\u00f6xt og uppgufun. d10- og d90-st\u00e6r\u00f0ir efnisins eru mikilv\u00e6gar \u00fev\u00ed \u00fe\u00e6r \u00e1kvar\u00f0a v\u00f6xtarm\u00f6rk, h\u00e1marksp\u00f6kkun\u00fe\u00e9ttleika og varmast\u00f6\u00f0ugleika. Hins vegar hefur k\u00edsilkarb\u00eddduft h\u00e1a me\u00f0alagnar\u00feverm\u00e1l en l\u00e1gt d90 og \u00fear af lei\u00f0andi l\u00e6gra d10.<\/p>\n
Ni\u00f0urst\u00f6\u00f0urnar h\u00e9r a\u00f0 ofan s\u00fdna a\u00f0 blanda af k\u00edsilkarb\u00ed\u00f0dufti me\u00f0 mismunandikornast\u00e6r\u00f0um getur auki\u00f0 \u00fe\u00e9ttleika prenta\u00f0s hluta. \u00cd fyrri ranns\u00f3knum var blanda\u00f0 duftm\u00e1l efnivi\u00f0s undirb\u00fai\u00f0 me\u00f0 tilraunum og mist\u00f6kum. \u00cd \u00feessari ranns\u00f3kn voru nota\u00f0ar tilrauna- og l\u00edkanager\u00f0ara\u00f0fer\u00f0ir til a\u00f0 undirb\u00faa blanda\u00f0a duftm\u00e1l efnivi\u00f0. Tv\u00ed\u00fe\u00e6tt duft var \u00fatb\u00fai\u00f0 me\u00f0 \u00fev\u00ed a\u00f0 blanda saman tveimur mismunandi st\u00e6r\u00f0um k\u00edsilkarb\u00edddufts. Hylkisdensiteti \u00feessara dufta var m\u00e6ldur og k\u00edsilkarb\u00edtspl\u00f6tur voru prenta\u00f0ar me\u00f0 \u00feessari tv\u00ed\u00fe\u00e6ttu bl\u00f6ndu.<\/p>\n
Samanbur\u00f0ur \u00e1 st\u00e6r\u00f0ardreifingu SiC-dufts sem f\u00e6st me\u00f0 BET og SEM sta\u00f0festi a\u00f0 SSA-gildi \u00ed \u00feessum s\u00fdnum v\u00e6ru innan vi\u00f0unandi marka. SSA-gildi tveggja mj\u00f6g hreina b-SiC-duftanna reyndust vera samhverf \u00e1 bilinu 25\/75. Ennfremur voru \u00feau \u00ed g\u00f3\u00f0u samr\u00e6mi vi\u00f0 \u00fatreiknu\u00f0u SSA-gildin: 48 m2\/g fyrir 25\/75-bl\u00f6nduna og 33,9 m2\/g fyrir 75\/25-bl\u00f6nduna.<\/p>\n
\u00de\u00f3 a\u00f0 SIKA-dufti\u00f0 s\u00fdndi j\u00f6fna agast\u00e6r\u00f0, s\u00fdnir FAU-s\u00fdni\u00f0 mismunandi st\u00e6r\u00f0ardreifingu. \u00c1 hinn b\u00f3ginn s\u00fdndi FAU-dufti\u00f0 greinilegt mynstur sm\u00e1s, k\u00fapts og st\u00f3rs agna. \u00de\u00e6r st\u00f3ru agnir h\u00f6f\u00f0u h\u00e6rri \u00fe\u00e9ttleika en hinar litlu. \u00deessi \u00fe\u00e9ttleikamunur stafar af mun \u00e1 p\u00f6kkun\u00fe\u00e9ttleika. \u00der\u00e1tt fyrir \u00fea\u00f0 nota\u00f0i SIKA-grunnefni\u00f0 meira magn af dufti en hi\u00f0 fyrrnefnda.<\/p>\n
St\u00e6r\u00f0ardreifingar k\u00edsilkarb\u00ed\u00f0dufts einkennast af nokkrum munum. SIKA-dufti\u00f0 s\u00fdnir m\u00fdkri formger\u00f0arbreytingu en hitt. Hins vegar s\u00fdnir SIKA-dufti\u00f0 meiri tilhneigingu til a\u00f0 \u00feola varmaskokk og a\u00f0l\u00f6gun a\u00f0 toppv\u00f6xtarvi\u00f0m\u00f3tinu. \u00deessi munur er raki\u00f0 til skorts \u00e1 kolefnisryksskildi milli fr\u00e6- og uppsprettuduftsins. En \u00feessar breytingar stafa ekki einungis af notkun SIKA-duftsins; sm\u00e1v\u00e6gilegar breytingar \u00e1 h\u00f6nnun heita sv\u00e6\u00f0isins geta b\u00e6tt \u00far \u00feessu fyrirb\u00e6ri.<\/p>\n
Eiginleikar k\u00edsilkarb\u00ed\u00f0dufts<\/p>\n
Eiginleikar k\u00edsilkarb\u00ed\u00f0dufts r\u00e1\u00f0ast af samsetningu \u00feess, fj\u00f6lkrist\u00f6llu\u00f0u uppbyggingu og myndunarh\u00e1ttum. Einstakt kristall k\u00edsilkarb\u00ed\u00f0s er af alfa-ger\u00f0 hva\u00f0 var\u00f0ar samsetningu og h\u00f6rku. \u00dea\u00f0 eru nokkrar ger\u00f0ir af k\u00edsilkarb\u00ed\u00f0i. Hver ger\u00f0 hefur s\u00e9rkenni, en allar teljast sl\u00edpiefni. D\u00e6mi um k\u00edsilkarb\u00ed\u00f0duft eru eftirfarandi:<\/p>\n
Uppbygging efnisins er s\u00edl\u00edndr\u00edsk, me\u00f0 l\u00f6gum af a-SiC og b-SiC a\u00f0 utan. \u00deetta efni er gr\u00e6nt k\u00edsilkarb\u00ed\u00f0 e\u00f0a svart k\u00edsilkarb\u00ed\u00f0 og finnst \u00ed m\u00f6rgum myndum, fr\u00e1 dufti til ing\u00f3ta. Hver tegund k\u00edsilkarb\u00ed\u00f0s er unnin eftir notkunarsvi\u00f0i s\u00ednu og m\u00e1 mala hana til a\u00f0 \u00f6\u00f0last \u00e6skilega eiginleika. Vegna samsettra e\u00f0lis- og efnaeiginleika sinna er k\u00edsilkarb\u00ed\u00f0 hentugt efni til notkunar \u00ed fj\u00f6lm\u00f6rgum forritum \u00fear sem krafist er h\u00e1hita\u00feols og slit\u00feols.<\/p>\n
SiC-kristallar samanstanda af \u00feremur mismunandi myndbreytingum. Alfa-s\u00edlankarb\u00ed\u00f0 myndast vi\u00f0 h\u00e6rri hitastig en beta-s\u00edlankarb\u00ed\u00f0, me\u00f0 sexhyrnda kristalsbyggingu sem l\u00edkist Wurtzite. Beta-s\u00edlankarb\u00ed\u00f0 hefur aftur \u00e1 m\u00f3ti mun reglulegri kristalsbyggingu og l\u00edkist demanti. B\u00e1\u00f0ar ger\u00f0irnar eru gagnlegar \u00ed framlei\u00f0slu, en alfa-s\u00edlankarb\u00ed\u00f0 hefur f\u00e1ar vi\u00f0skiptalegar notkunarm\u00f6guleika. Beta-s\u00edlankarb\u00ed\u00f0 er a\u00f0allega nota\u00f0 sem stu\u00f0ningsefni fyrir hvata.<\/p>\n
K\u00edsilkarb\u00ed\u00f0 er fj\u00f6lh\u00e6ft sl\u00edpiefni me\u00f0 m\u00f6rgum notkunarm\u00f6guleikum \u00ed \u00fdmsum i\u00f0na\u00f0i. Vegna h\u00f6rku sinnar er \u00fea\u00f0 fr\u00e1b\u00e6rt efni fyrir sl\u00edpivinnslu. \u00dea\u00f0 \u00feolir einnig h\u00e1an hita og er nota\u00f0 \u00ed h\u00e1g\u00e6\u00f0a keramikbremsusk\u00edfur fyrir bifrei\u00f0ar, skotvarnarvesti og \u00fe\u00e9ttingar \u00e1 d\u00e6lu\u00e1sum. K\u00edsilkarb\u00ed\u00f0 hefur einnig mikla varmalei\u00f0ni, sem gerir \u00fea\u00f0 kj\u00f6rinn \u00ed h\u00e1hita-eldfastar efnisger\u00f0ir. Einnig er ver\u00f0 k\u00edsilkarb\u00ed\u00f0s mismunandi eftir notkun.<\/p>\n
Gr\u00e6nt k\u00edsilkarb\u00ed\u00f0 er einnig gagnlegt fyrir h\u00e1lflei\u00f0ara. H\u00e1a spennu\u00feol \u00feess er t\u00edu sinnum meira en hj\u00e1 venjulegum k\u00edsli. \u00deetta gerir \u00fea\u00f0 betra en gall\u00edumn\u00edtr\u00ed\u00f0 \u00ed kerfum yfir 1000 V. Vegna \u00feessa er k\u00edsilkarb\u00ed\u00f0 afar ver\u00f0m\u00e6tt \u00ed rafmagnsb\u00edlum, s\u00f3larrafmagnsbreytum og skynjurakerfum. Ef \u00fe\u00fa hefur \u00e1huga \u00e1 a\u00f0 \u00fer\u00f3a n\u00fdja v\u00f6ru e\u00f0a finna n\u00fdjan marka\u00f0 fyrir gamla v\u00f6ru, g\u00e6ti keram\u00edk \u00far k\u00edsilkarb\u00ed\u00f0i veri\u00f0 kj\u00f6rin lausn; k\u00edsilkarb\u00ed\u00f0 er einnig \u00f3d\u00fdrt og af g\u00f3\u00f0um g\u00e6\u00f0um.<\/p>\n
XRD-spectrografinn gerir kleift a\u00f0 rannsaka frumeindabyggingu k\u00edsilkarb\u00ed\u00f0dufts og veitir n\u00e1kv\u00e6ma s\u00fdn \u00e1 uppbyggingu og samsetningu s\u00fdnis. Spektralt upplausn t\u00e6kisins er 1 cm\u207b\u00b9, sem gerir m\u00e6lingar m\u00f6gulegar jafnvel vi\u00f0 l\u00e1gan hita. \u00d3l\u00edkar bylgjulengdir eru nota\u00f0ar fyrir lj\u00f3sefnis\u00fatgeislun og Raman-merki, svo mikilv\u00e6gt er a\u00f0 a\u00f0skilja \u00feau. Enn fremur getur \u00feessi a\u00f0fer\u00f0 greint mun \u00e1 eiginleikum mismunandi s\u00fdna.<\/p>","protected":false},"excerpt":{"rendered":"
Svart k\u00edsilkarb\u00ed\u00f0 er unni\u00f0 samkv\u00e6mt n\u00e1kv\u00e6mum forskriftum. N\u00e1kv\u00e6m st\u00e6r\u00f0ar- og kornal\u00f6gunarst\u00fdring tryggir samr\u00e6mda yfirbor\u00f0s\u00e1fer\u00f0. K\u00edsilkarb\u00ed\u00f0duft f\u00e6st \u00ed nokkrum sl\u00edpigr\u00f3\u00f0ursst\u00e6r\u00f0um og \u00ed magni fimm, t\u00edu e\u00f0a tuttugu og fimm punda. St\u00e6rri magn m\u00e1 panta eftir bei\u00f0ni. \u00dea\u00f0 er miki\u00f0 nota\u00f0 \u00ed \u00fer\u00fdstiblystri. Lestu \u00e1fram til a\u00f0 f\u00e1 n\u00e1nari uppl\u00fdsingar. \u2026 Read more<\/a><\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-6","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/siliconcarbidepowders.com\/is\/wp-json\/wp\/v2\/posts\/6","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/siliconcarbidepowders.com\/is\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/siliconcarbidepowders.com\/is\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/siliconcarbidepowders.com\/is\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/siliconcarbidepowders.com\/is\/wp-json\/wp\/v2\/comments?post=6"}],"version-history":[{"count":4,"href":"https:\/\/siliconcarbidepowders.com\/is\/wp-json\/wp\/v2\/posts\/6\/revisions"}],"predecessor-version":[{"id":10,"href":"https:\/\/siliconcarbidepowders.com\/is\/wp-json\/wp\/v2\/posts\/6\/revisions\/10"}],"wp:attachment":[{"href":"https:\/\/siliconcarbidepowders.com\/is\/wp-json\/wp\/v2\/media?parent=6"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/siliconcarbidepowders.com\/is\/wp-json\/wp\/v2\/categories?post=6"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/siliconcarbidepowders.com\/is\/wp-json\/wp\/v2\/tags?post=6"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}