I mo r\u00e9imse oibre mar shaineola\u00ed ar \u00e1bhair athraonta le breis agus 20 bliain de thaith\u00ed agam, chonaic m\u00e9 a l\u00e1n nu\u00e1la\u00edochta\u00ed ag teacht agus ag imeacht. Ach carb\u00f3n sileacain nasctha le n\u00edtr\u00edd? Sin ceann acu a d'fhan linn, agus is maith an ch\u00fais at\u00e1 leis sin. Sin an t-\u00e1bhar a dt\u00e9ann t\u00fa chuige nuair a bh\u00edonn an teocht ag ard\u00fa go hard, nuair a bh\u00edonn an chreimeadh ag greime\u00e1il go dian, agus nuair a theasta\u00edonn uait rud \u00e9igin nach ng\u00e9illfidh leath bealaigh tr\u00ed sheisi\u00fan t\u00e1irgthe. Is minic a ghiorra\u00edtear \u00e9 mar NBSiC n\u00f3 d\u00edreach SiC nasctha le n\u00edtr\u00edd, agus comhcheangla\u00edonn an t-\u00e1bhar teimhneach seo cruach an charb\u00f3id shileacain le cumhacht cheangail an n\u00edtr\u00edde shileacain chun t\u00e1irge a chruth\u00fa at\u00e1 garbh, \u00e9ifeachtach, agus thar a bheith il\u00fas\u00e1ideach. C\u00e9 nach \u00e9 an rogha is suntasa\u00ed amuigh ansin \u00e9, is \u00e9 a fheidhm\u00edocht i su\u00edomhanna an tsaoil fh\u00edor a fh\u00e1gann gur rogha ion\u00fain \u00e9 i measc innealt\u00f3ir\u00ed sa mhiotal\u00f3ireacht, sa chr\u00e9-earra\u00ed, agus n\u00edos faide i gc\u00e9in. Breathna\u00edmis n\u00edos g\u00e9ire ar an m\u00e9id a chuireann ag obair \u00e9\u2014\u00f3n mbealach a dh\u00e9antar \u00e9 a chur le ch\u00e9ile go dt\u00ed na r\u00e9ims\u00ed ina s\u00e1ra\u00edonn s\u00e9, agus fi\u00fa na m\u00edbhunt\u00e1ist\u00ed ar cheart duit a bheith ar an eolas f\u00fathu. M\u00e1 t\u00e1 t\u00fa ag sonr\u00fa \u00e1bhar d'oibr\u00edochta\u00ed ardteochta, d'fh\u00e9adfadh s\u00e9 seo cabhr\u00fa leat cinneadh a dh\u00e9anamh an \u00e9 an rogha cheart \u00e9.<\/p>\n
<\/p>\n
Is iad na comhph\u00e1irteanna amha agus an bealach cliste ina gcuirtear le ch\u00e9ile iad a chrutha\u00edonn bun\u00fas an charb\u00f3id sileacain at\u00e1 nasctha le n\u00edtr\u00edde. Tosa\u00edonn s\u00e9 ar fad le gr\u00e1inn\u00ed carb\u00f3id sileacain, a th\u00e1irgtear tr\u00edd an bpr\u00f3iseas clasaiceach Acheson: measc\u00e1n de ghaineamh sileacain agus de charb\u00f3n a th\u00e9amh go teochta\u00ed f\u00edor-ard, os cionn 2000\u00b0C, i bhfoirn\u00e9is \u00e1irse leictreach. As seo a thagann na c\u00e1ithn\u00edn\u00ed crua, criostail\u00edneacha SiC sin at\u00e1 c\u00e1ili\u00fail as a marthanacht. Chun iad a cheangal le ch\u00e9ile, meascann monar\u00f3ir\u00ed p\u00fadar sileacain isteach agus m\u00fanla\u00edonn siad an measc\u00e1n i gcruthanna cos\u00fail le bloic n\u00f3 fead\u00e1in. Ansin, tagann an ch\u00e9im is t\u00e1bhachta\u00ed\u2014\u00e1 loscadh in atmaisf\u00e9ar n\u00edtrigine ag 1400 go 1500\u00b0C. Anseo, d\u00e9anann an sileacan imoibri\u00fa leis an n\u00edtrigin chun n\u00edtr\u00edd sileacain (Si3N4) a chruth\u00fa, a fh\u00e1sann mar l\u00edonra de chriostail mh\u00edne a ghlas\u00e1lann na gr\u00e1inn\u00ed SiC ina n-\u00e1it. Is \u00e9 an toradh n\u00e1 c\u00f3imhiotal ina bhfuil 80% n\u00f3 n\u00edos m\u00f3 de thoirtim\u00e9adar an SiC, agus an n\u00edtr\u00edd ag feidhmi\u00fa mar cheangl\u00f3ir l\u00e1idir, l\u00e1rnach. N\u00ed theasta\u00edonn aon ghli\u00fanna n\u00e1 cr\u00e9anna breise, rud a choinn\u00edonn na h\u00e1bhair \u00edon agus ardfheidhm\u00edocht acu. M\u00e1 scr\u00fada\u00edtear an micristrucht\u00far, t\u00e1 s\u00e9 an-sp\u00e9isi\u00fail: b\u00edonn an Si3N4 le feice\u00e1il mar fionnadh fadaithe at\u00e1 fite fuaite leis na criostail bhlocacha SiC, ag cruth\u00fa maitr\u00eds at\u00e1 dl\u00fath ach a bhfuil p\u00f3ireacht rialaithe inti.<\/p>\n
Maidir le hair\u00edonna, t\u00e1 an t-\u00e1bhar seo thar a bheith cumhachtach i roinnt r\u00e9ims\u00ed r\u00edth\u00e1bhachtacha. Go teirmeach, is f\u00e9idir leis teochta\u00ed seirbh\u00edse suas le 1650\u00b0C a sheasamh i nd\u00e1la\u00ed ocsa\u00eddi\u00fach\u00e1in, agus n\u00edos airde f\u00f3s uaireanta i dtimpeallachta\u00ed laghdaitheacha. Crutha\u00edonn scann\u00e1n sileac\u00e1ite cosanta ar an dromchla nuair a bh\u00edonn s\u00e9 nochtaithe don aer, ag s\u00e9al\u00fa \u00e9 in aghaidh tuilleadh meatha. Seasann a thearmhionduchtacht amach freisin\u2014idir 20 agus 40 W\/m\u00b7K de ghn\u00e1th\u2014at\u00e1 iontach d'fheidhmchl\u00e1ir a dteasta\u00edonn d\u00e1ileadh cothrom teasa uathu, mar i gc\u00e1s eilimint\u00ed t\u00e9imh. Le c\u00f3imheas leathnaithe teirmeach de thart ar 4.0 x 10^-6 in aghaidh \u00b0C, seasann s\u00e9 in aghaidh na strusanna a bhaineann le timthriallta gasta t\u00e9imh agus fuaraithe a bhrisfadh roghanna n\u00edos briosc. Ar an taobh meicni\u00fail, is minic a sh\u00e1ra\u00edonn na neartanna comhbhr\u00faite 200 MPa, agus t\u00e1 a fhriota\u00edocht in aghaidh creimthe den scoth, a bhu\u00ed le r\u00e1t\u00e1il chruas SiC at\u00e1 gar don diamant. Rinne m\u00e9 t\u00e1st\u00e1lacha inar sheas sampla\u00ed do shileadh br\u00faite ionsamhlaithe a chreimeodh br\u00edc\u00ed al\u00famanaim i leath na tr\u00e9imhse.<\/p>\n
Ansin t\u00e1 an t-athl\u00e9imneacht cheimiceach. Seasann SiC le nasc n\u00edtr\u00edde in aghaidh r\u00e9imse leathan ionsaitheoir\u00ed\u2014aig\u00e9id, bunanna, miotail le\u00e1ite, agus salainn. Le linn al\u00famanam a le\u00e1, mar shampla, cuireann s\u00e9 i gcoinne ionsaithe fluair\u00edde a chreimeann \u00e1bhair mh\u00fascailte eile. T\u00e1 dl\u00fas an \u00e1bhair idir 2.7 agus 3.1 g\/cm\u00b3, rud a fh\u00e1gann go bhfuil s\u00e9 n\u00edos \u00e9adroime n\u00e1 go leor ceirmeach dl\u00fath, rud a \u00e9asca\u00edonn an tsuite\u00e1il i strucht\u00fair mh\u00f3ra. De ghn\u00e1th, b\u00edonn an p\u00f3ireacht idir 10-20%, rud a cheada\u00edonn roinnt sreafa g\u00e1is gan an t-ioml\u00e1n a lag\u00fa. Ach is fi\u00fa a thabhairt faoi deara go bhf\u00e9adfadh an ch\u00e9im n\u00edtr\u00edde hidreal\u00fa i socruithe tais ardteochta os cionn 1400\u00b0C, as a dtiocfadh meath. Mar sin, t\u00e1 r\u00f3l m\u00f3r ag facht\u00f3ir\u00ed comhshaoil ina shaolr\u00e9.<\/p>\n
Maidir le feidhmeanna, t\u00e1 SiC nasctha le n\u00edtr\u00edd thar barr i dtimpeallachta\u00ed nach bhfuil teip ina rogha. I dtionscal na cruach, is \u00e1bhar bun\u00fasach \u00e9 le haghaidh l\u00edne\u00e1lacha foirn\u00e9ise pl\u00e9asctha, go h\u00e1irithe sa chuid \u00edochtair den stoc agus sa chrios tine a bh\u00edonn nochtaithe do theas dian agus do bhuille meicni\u00fail. Chuir m\u00e9 comhairle ar f\u00e1il tr\u00e1th maidir le hathl\u00edne\u00e1il inar fhadhnaigh \u00fas\u00e1id SiC an tr\u00e9imhse oibr\u00edochta \u00f3 8 m\u00ed go dt\u00ed breis agus 2 bhliain, rud a laghdaigh na costais go m\u00f3r. I gc\u00e1s miotal neamh-iarannach ar n\u00f3s copair n\u00f3 since, \u00fas\u00e1idtear \u00e9 i gcr\u00faisil\u00e9id, i sp\u00faits agus i loine\u00e1in; n\u00ed fhliuchann a dhromchla go h\u00e9asca, mar sin n\u00ed ghreamann an miotal de agus n\u00ed chrutha\u00edonn s\u00e9 bac\u00e1in. I dt\u00e1irgeadh ceirmeach, feidhm\u00edonn s\u00e9 mar sheilfeanna agus mar thaca\u00ed \u00e1ith, ag seasamh in aghaidh lasadh ar\u00eds agus ar\u00eds eile gan g\u00e9illeadh.<\/p>\n
Lasmuigh den d\u00e9ant\u00fasa\u00edocht thraidisi\u00fanta, gheofar \u00e9 i monarchana dramha\u00edola-go-fuinneamh a l\u00edne\u00e1lann d\u00f3ireanna in aghaidh ghal\u00e1n creimneach, n\u00f3 i bpr\u00f3ise\u00e1il cheimiceach do shoith\u00ed a l\u00e1imhse\u00e1lann substaint\u00ed imoibr\u00edocha. Le d\u00e9ana\u00ed, t\u00e1 s\u00e9 le f\u00e1il i gc\u00f3rais fuinnimh ardleibh\u00e9il, cos\u00fail le himoibreoir\u00ed singhais n\u00f3 ti\u00fachanad\u00f3ir\u00ed gr\u00e9ine. Is f\u00e9idir \u00e9 a mh\u00fanl\u00fa go sol\u00fabtha\u2014br\u00faitear ina bhr\u00edc\u00ed caighde\u00e1nacha n\u00f3 i bhfoirmeacha saincheaptha \u00e9, agus a thois\u00ed ag athr\u00fa go m\u00f3r. Le linn an tsuite, bain \u00fas\u00e1id as moirt\u00e9il at\u00e1 comhoiri\u00fanach le SiC chun na tortha\u00ed is fearr a fh\u00e1il. An costas? T\u00e1 s\u00e9 n\u00edos costasa\u00ed n\u00e1 gn\u00e1thbhr\u00edc\u00ed d\u00f3ite\u00e1in, b'fh\u00e9idir $5-10 in aghaidh an kg, ach i l\u00e1ithreacha ardchaitheamh, \u00edocann s\u00e9 as f\u00e9in go tapa de bharr an chothabh\u00e1la laghdaithe.<\/p>\n
Ar nd\u00f3igh, cos\u00fail le haon \u00e1bhar, t\u00e1 a theorainneacha f\u00e9in aige. \u00c9il\u00edonn an pr\u00f3iseas d\u00e9ant\u00fasa\u00edochta cruinneas; mura bhfuil an n\u00edtri\u00fa ioml\u00e1n, d'fh\u00e9adf\u00e1 cr\u00edocha laga a bheith agat at\u00e1 soghonta don teip. Gineann l\u00e1imhse\u00e1il agus meais\u00edni\u00fa deannach at\u00e1 ina chont\u00fairt sl\u00e1inte\u2014carcanaigin\u00edoch go teoirici\u00fail\u2014mar sin, \u00e1itigh i gc\u00f3na\u00ed ar rial\u00fa ceart deannaigh agus ar threalamh cosanta. \u00d3 thaobh an \u00e9iceola\u00edochta de, \u00edd\u00edonn a dh\u00e9ant\u00fasa\u00edocht a l\u00e1n fuinnimh, ach t\u00e1 dul chun cinn sa athch\u00fars\u00e1il ag cabhr\u00fa: faigheann roinnt oibr\u00edochta\u00ed 60-70% de SiC ar ais \u00f3 sheanchumhdaigh. I measc na bhforbairt\u00ed amach anseo t\u00e1 leaganacha n\u00edos l\u00e1idre le sn\u00e1ith\u00edn\u00ed breise le haghaidh friota\u00edocht n\u00edos fearr in aghaidh briste, n\u00f3 fi\u00fa p\u00e1irteanna 3D-phriont\u00e1ilte chun dramha\u00edl a \u00edoslaghd\u00fa.<\/p>\n
Mar fhocal scoir, n\u00ed hamh\u00e1in gur \u00e1bhar teanntach eile \u00e9 an carb\u00f3n sileacain le nascadh n\u00edtr\u00edde\u2014is comhghuaill\u00ed cruthaithe \u00e9 chun dul i ngleic leis na d\u00fashl\u00e1in theirmeacha agus cheimiceacha is deacra. Bunaithe ar mo thaith\u00ed sa r\u00e9imse, is \u00e9 an rogha \u00e9 a iompa\u00edonn oibr\u00edochta\u00ed neamh\u00e9ifeachtacha go minic ina gcuid \u00e9ifeachtach, mar shampla sa mhonarcha al\u00famanaim sin inar dh\u00fabail s\u00e9 saolr\u00e9 na croiche. M\u00e1 t\u00e1 t\u00fa \u00e1 mheas, d\u00e9an meas\u00fan\u00fa c\u00faramach ar do chuid coinn\u00edollacha\u2014raonta teochta, nochtadh do cheimice\u00e1in, strusanna meicni\u00fala\u2014agus seice\u00e1il caighde\u00e1in \u00e1bhartha amhail ASTM C863. T\u00e9igh i dteagmh\u00e1il le t\u00e1irgeoir\u00ed seanbhunaithe ar n\u00f3s Saint-Gobain n\u00f3 ESK Ceramics le haghaidh sonra\u00ed. Sa bhr\u00fa at\u00e1 ann sa l\u00e1 at\u00e1 inniu ann i dtreo tionscail inbhuanaithe, t\u00e1 \u00e1bhair mar seo r\u00edth\u00e1bhachtach, ag meascadh iontaofachta leis an acmhainneacht do dhul chun cinn n\u00edos m\u00f3 f\u00f3s.<\/p>","protected":false},"excerpt":{"rendered":"
Nitride Bonded Silicon Carbide: A Stalwart in the Face of Industrial Extremes In my line of work as a refractory materials expert with over 20 years under my belt, I’ve seen a lot of innovations come and go. But nitride bonded silicon carbide? That’s one that has stuck around, and for good reason. It’s the […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-49","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/nitridebondedsic.com\/ga\/wp-json\/wp\/v2\/posts\/49","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nitridebondedsic.com\/ga\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nitridebondedsic.com\/ga\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nitridebondedsic.com\/ga\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nitridebondedsic.com\/ga\/wp-json\/wp\/v2\/comments?post=49"}],"version-history":[{"count":3,"href":"https:\/\/nitridebondedsic.com\/ga\/wp-json\/wp\/v2\/posts\/49\/revisions"}],"predecessor-version":[{"id":52,"href":"https:\/\/nitridebondedsic.com\/ga\/wp-json\/wp\/v2\/posts\/49\/revisions\/52"}],"wp:attachment":[{"href":"https:\/\/nitridebondedsic.com\/ga\/wp-json\/wp\/v2\/media?parent=49"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nitridebondedsic.com\/ga\/wp-json\/wp\/v2\/categories?post=49"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nitridebondedsic.com\/ga\/wp-json\/wp\/v2\/tags?post=49"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}