D\u00e9antar carbide sileacain dubh a phr\u00f3ise\u00e1il de r\u00e9ir sonra\u00edochta\u00ed beachta. Cinnt\u00edonn gr\u00e1d\u00fa agus cruth c\u00e1ithn\u00edn\u00ed a nd\u00e9antar dl\u00fathsmacht orthu bailchr\u00edocha comhsheasmhacha. T\u00e1 p\u00fadair charb\u00e1id sileacain ar f\u00e1il i roinnt m\u00e9ideanna gr\u00e1inne abrasaigh agus i gcainn\u00edochta\u00ed c\u00faig, deich, n\u00f3 c\u00faig phunt is fiche. Is f\u00e9idir toirteanna n\u00edos m\u00f3 a ord\u00fa ach iad a iarraidh. Baintear \u00fas\u00e1id fhorleathan as i mbr\u00faphl\u00e9ascadh. L\u00e9igh ar aghaidh le haghaidh tuilleadh eolais. Is f\u00e9idir leat tuilleadh a fhoghlaim freisin faoi air\u00edonna agus sint\u00e9is p\u00fadair charb\u00e1id sileacain.<\/p>\n
D\u00e1ilt\u00ed m\u00e9ideanna p\u00fadair charb\u00f3ide sileacain<\/p>\n
Tuairisc\u00edtear sa ph\u00e1ip\u00e9ar seo d\u00e1ilt\u00ed m\u00e9ide p\u00fadair charb\u00f3ide sileacain. Rinneadh an t-\u00e1bhar seo a mhonar\u00fa tr\u00ed mheilteadh frithchuimilte. Ba \u00e9 37 nm m\u00e9id na gc\u00e1ithn\u00edn\u00ed san \u00e1bhar pr\u00f3ise\u00e1ilte deiridh. Ansin, sintre\u00e1ladh an t-\u00e1bhar gan bhr\u00fa tr\u00ed charb\u00f3n agus carb\u00e1id b\u00f3r\u00f3n a chur leis ag teocht 2050 c\u00e9im C. Cinneadh na d\u00e1ilt\u00ed m\u00e9ide c\u00e1ithn\u00edn\u00ed le micreasc\u00f3p leictreon tras-tionscanta (TEM).<\/p>\n
B\u00edonn tionchar ag d\u00e1ileadh m\u00e9ide p\u00fadair SiC ar mhodhanna pr\u00f3ise\u00e1la \u00e9ags\u00fala, lena n-\u00e1ir\u00edtear f\u00e1s criostail agus subl\u00fa. T\u00e1 na m\u00e9ideanna d10 agus d90 den \u00e1bhar seo t\u00e1bhachtach toisc go gcinn\u00edonn siad an comh\u00e9adan f\u00e1is, an dl\u00fas pac\u00e1la uasta, agus an chobhsa\u00edocht theirmeach. Mar sin f\u00e9in, t\u00e1 trastomhas me\u00e1nach ard c\u00e1ithn\u00edn\u00ed ag p\u00fadar carb\u00f3n\u00e1ide sileacain agus d10 \u00edseal, agus d\u00e1 bhr\u00ed sin t\u00e1 d90 \u00edseal aige.<\/p>\n
L\u00e9ir\u00edonn na tortha\u00ed thuas go bhfuil measc\u00e1n de ph\u00fadar carbide sileacain de mh\u00e9ideanna \u00e9ags\u00fala in ann dl\u00fas an chomhph\u00e1irt phriont\u00e1ilte a mh\u00e9ad\u00fa. I staid\u00e9ir roimhe seo, ullmha\u00edodh an stoc-\u00e1bhar p\u00fadair mheasctha tr\u00ed thriail agus earr\u00e1id. Sa taighde reatha, baineadh \u00fas\u00e1id as modhanna turgnamhacha agus samhaltaithe chun an stoc-\u00e1bhar p\u00fadair mheasctha a ullmh\u00fa. Ullmha\u00edodh p\u00fadar d\u00e9mhodhach tr\u00ed dh\u00e1 mh\u00e9id \u00e9ags\u00fala de ph\u00fadar carbide sileacain a mheascadh. Tomhaiseadh dl\u00fais tap\u00e1la na bp\u00fadair seo, agus priont\u00e1ladh pl\u00e1ta\u00ed carbide sileacain ag \u00fas\u00e1id an mheasc\u00e1in dh\u00e9imhodhaigh.<\/p>\n
Dheimhnigh compar\u00e1id idir d\u00e1ileadh m\u00e9ideanna p\u00fadair SiC a fuarthas le BET agus SEM go raibh luachanna SSA sna sampla\u00ed seo laistigh de theorainneacha inghlactha. Fuarthas amach go raibh SSAanna an d\u00e1 ph\u00fadar b-SiC an-ghlan sim\u00e9adrach sa raon 25\/75. Ina theannta sin, th\u00e1inig siad le ch\u00e9ile go maith leis na luachanna SSA r\u00edofa: 48 m2\/g don chomhdh\u00e9anamh 25\/75 agus 33.9 m2\/g don chomhdh\u00e9anamh 75\/25.<\/p>\n
C\u00e9 gur l\u00e9irigh p\u00fadar SIKA m\u00e9id c\u00e1ithn\u00edn\u00ed aonfhoirmeach, l\u00e9ir\u00edonn an sampla FAU d\u00e1ilte m\u00e9ideanna \u00e9ags\u00fala. I gcodarsnacht leis sin, l\u00e9irigh p\u00fadar FAU patr\u00fan soil\u00e9ir de ch\u00e1ithn\u00edn\u00ed beaga, cuibheasacha, agus m\u00f3ra. Bh\u00ed dl\u00fas n\u00edos airde ag na cinn deireanacha n\u00e1 na cinn tosaigh. Is toradh ar an difr\u00edocht i ndl\u00fas an phac\u00e1istithe \u00ed an difr\u00edocht seo i ndl\u00fas. Ina ainneoin sin, d'\u00eddi\u00e1il an t-\u00e1bhar foinse SIKA m\u00e9id n\u00edos m\u00f3 p\u00fadair n\u00e1 an ceann tosaigh.<\/p>\n
T\u00e1 roinnt difr\u00edochta\u00ed ag baint le d\u00e1ileadh m\u00e9ideanna na bp\u00fadar carb\u00f3ide sileacain. L\u00e9ir\u00edonn an p\u00fadar SIKA aistri\u00fa morfola\u00edoch n\u00edos m\u00edne n\u00e1 an ceann deireanach. Mar sin f\u00e9in, l\u00e9ir\u00edonn an p\u00fadar SIKA claonadh n\u00edos l\u00e1idre chun friota\u00edocht a dh\u00e9anamh in aghaidh turraing theirmigh agus chun oiri\u00fan\u00fa don chomh\u00e9adan f\u00e1is uachtair. Cuirtear an difr\u00edocht seo i leith easpa sciath deannaigh charb\u00f3in idir an s\u00edol agus an p\u00fadar foinse. Ach n\u00ed toradh ar fheidhmi\u00fa an ph\u00fadair SIKA amh\u00e1in iad na difr\u00edochta\u00ed seo; is f\u00e9idir an feinim\u00e9an seo a chur faoi chois le hoiri\u00fanuithe beaga ar dhearadh an limist\u00e9ir the.<\/p>\n
Air\u00edonna p\u00fadair charb\u00e1ide sileacain<\/p>\n
Braitheann air\u00edonna an ph\u00fadair charb\u00e1ide sileacain ar a chomhdh\u00e9anamh, a strucht\u00far ilchriostallach, agus a mhodh foirmi\u00fach\u00e1in. B\u00edonn aonchriostal carb\u00e1ide sileacain alfa \u00f3 thaobh comhdh\u00e9anaimh agus cruas. T\u00e1 roinnt cine\u00e1lacha carb\u00e1ide sileacain ann. T\u00e1 air\u00edonna ar leith ag gach cine\u00e1l, ach meastar gur abrasaithe iad go l\u00e9ir. I measc na sampla\u00ed de ph\u00fadair charb\u00e1ide sileacain t\u00e1 na nithe seo a leanas:<\/p>\n
T\u00e1 strucht\u00far sorc\u00f3ireach ag an \u00e1bhar, le sraitheanna de a-SiC agus b-SiC ar an taobh amuigh. Is carb\u00e1id sileacain ghlas n\u00f3 dhubh \u00e9 an t-\u00e1bhar seo agus is f\u00e9idir \u00e9 a fh\u00e1il i go leor foirmeacha, \u00f3 ph\u00fadar go hiongaid. D\u00e9antar gach cine\u00e1l carb\u00f3id sileacain a phr\u00f3ise\u00e1il d\u00e1 fheidhm agus is f\u00e9idir \u00e9 a bhr\u00fa chun na hair\u00edonna inmhianaithe a fh\u00e1il. Mar gheall ar a chomhcheangal d'air\u00edonna fisiceacha agus ceimiceacha, is \u00e1bhar inmharthana \u00e9 carb\u00f3n sileacain le h\u00fas\u00e1id i r\u00e9imse feidhmeanna ardteochta agus frithsheasmhachta in aghaidh caitheamh.<\/p>\n
T\u00e1 criostail SiC comhdh\u00e9anta de thr\u00ed chine\u00e1l \u00e9ags\u00fala polaimorf. Foirmeann carb\u00f3nsileacain alfa ag teochta\u00ed n\u00edos airde n\u00e1 carb\u00f3nsileacain b\u00e9ite, agus t\u00e1 an strucht\u00far criostalach heicsag\u00e1nach cos\u00fail le Wurtzite. Ar an l\u00e1imh eile, t\u00e1 strucht\u00far n\u00edos criostala\u00ed ag carb\u00f3nsileacain b\u00e9ite agus t\u00e1 s\u00e9 cos\u00fail le diamant. T\u00e1 an d\u00e1 chine\u00e1l \u00fas\u00e1ideach sa d\u00e9ant\u00fasa\u00edocht, ach is beag feidhm tr\u00e1cht\u00e1la a bhaineann le carb\u00f3nsileacain alfa. \u00das\u00e1idtear carb\u00f3nsileacain b\u00e9ite go pr\u00edomha mar thaca do chatala\u00edoch.<\/p>\n
Is \u00e1bhar garbhaithe ild\u00e1nach \u00e9 an carb\u00f3n sileacain a bhfuil go leor feidhmeanna aige i dtionscail \u00e9ags\u00fala. Mar gheall ar a chruas, is \u00e1bhar den scoth \u00e9 don mheais\u00ednithe garbhaithe. Is f\u00e9idir leis freisin seasamh in aghaidh teochta\u00ed arda, agus \u00fas\u00e1idtear \u00e9 i ndiosca\u00ed ceirmeacha ardleibh\u00e9il do ghluaiste\u00e1in, i veist\u00ed frithdh\u00edonacha, agus i s\u00e9ala\u00ed cranncaid\u00e9al. T\u00e1 ard-ind\u00e9antacht theirmeach ag carb\u00f3n sileacain freisin, rud a fh\u00e1gann go bhfuil s\u00e9 an-oiri\u00fanach le h\u00fas\u00e1id i n-\u00e1bhair fhrithchaiteacha ardteochta. Chomh maith leis sin, b\u00edonn praghas difri\u00fail ar charb\u00f3n sileacain ag brath ar an bhfeidhm.<\/p>\n
T\u00e1 carb\u00e1id sileacain ghlas \u00fas\u00e1ideach freisin do leathsheolt\u00f3ir\u00ed. T\u00e1 a fhriota\u00edocht ard ar bholtas deich n-uaire n\u00edos airde n\u00e1 friota\u00edocht an ghn\u00e1thshileacain. F\u00e1gann s\u00e9 seo go bhfuil s\u00e9 n\u00edos fearr n\u00e1 n\u00edtr\u00edd gailiam i gc\u00f3rais os cionn 1000V. Mar gheall air seo, t\u00e1 carb\u00e1id sileacain an-luachmhar in fheithicl\u00ed leictreacha, in iomp\u00f3id\u00ed cumhachta gr\u00e9ine, agus i gc\u00f3rais braiteoir\u00ed. M\u00e1 t\u00e1 suim agat i dt\u00e1irgeadh t\u00e1irge nua n\u00f3 i margadh nua a aimsi\u00fa do sheant\u00e1irge, d'fh\u00e9adfadh ceirmeacha carb\u00f3nsileacain a bheith ar an r\u00e9iteach id\u00e9alach, agus t\u00e1 praghas \u00edseal ar charb\u00f3nsileacan a bhfuil dea-chaighde\u00e1n aige.<\/p>\n
Ligeann an speictreagraf XRD staid\u00e9ar a dh\u00e9anamh ar strucht\u00fair adamhacha p\u00fadair charb\u00f3in\u00edde sileacain, rud a cheada\u00edonn l\u00e9argas mion a fh\u00e1il ar strucht\u00far agus ar chomhdh\u00e9anamh sampla. Is \u00e9 1 cm-1 an taifeach speictreamach at\u00e1 ag an ionstraim, rud a cheada\u00edonn tomhais fi\u00fa ag teochta\u00ed \u00edsle. \u00das\u00e1idtear tonnfhaid \u00e9ags\u00fala do chomhartha\u00ed l\u00fam\u00edn\u00e9iseachta agus Raman, mar sin t\u00e1 s\u00e9 t\u00e1bhachtach an d\u00e1 cheann a scaradh \u00f3na ch\u00e9ile. Ina theannta sin, t\u00e1 an modh seo in ann difr\u00edochta\u00ed a aithint i dtr\u00e9ithe sampla\u00ed \u00e9ags\u00fala.<\/p>","protected":false},"excerpt":{"rendered":"
Pr\u00f3ise\u00e1iltear carb\u00f3nsileacan dubh de r\u00e9ir sonra\u00edochta\u00ed beachta. Cinnt\u00edonn gr\u00e1d\u00fa agus cruth c\u00e1ithn\u00edn\u00ed a nd\u00e9antar dl\u00fathsmacht orthu bailchr\u00edocha comhsheasmhacha. T\u00e1 p\u00fadair charb\u00f3insileacain ar f\u00e1il i roinnt m\u00e9ideanna gr\u00e1inne gairbh agus i gcainn\u00edochta\u00ed c\u00faig, deich, n\u00f3 c\u00faig phunt is fiche. Is f\u00e9idir toirteanna n\u00edos m\u00f3 a ord\u00fa ach iad a iarraidh. \u00das\u00e1idtear go forleathan \u00e9 i mbr\u00faphl\u00e9ascadh. L\u00e9igh ar aghaidh le haghaidh tuilleadh eolais. \u2026 L\u00e9igh tuilleadh<\/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\/ga\/wp-json\/wp\/v2\/posts\/6","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/siliconcarbidepowders.com\/ga\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/siliconcarbidepowders.com\/ga\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/siliconcarbidepowders.com\/ga\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/siliconcarbidepowders.com\/ga\/wp-json\/wp\/v2\/comments?post=6"}],"version-history":[{"count":4,"href":"https:\/\/siliconcarbidepowders.com\/ga\/wp-json\/wp\/v2\/posts\/6\/revisions"}],"predecessor-version":[{"id":10,"href":"https:\/\/siliconcarbidepowders.com\/ga\/wp-json\/wp\/v2\/posts\/6\/revisions\/10"}],"wp:attachment":[{"href":"https:\/\/siliconcarbidepowders.com\/ga\/wp-json\/wp\/v2\/media?parent=6"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/siliconcarbidepowders.com\/ga\/wp-json\/wp\/v2\/categories?post=6"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/siliconcarbidepowders.com\/ga\/wp-json\/wp\/v2\/tags?post=6"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}