Sil\u012bcija karb\u012bds, ko parasti d\u0113v\u0113 par SSiC, ir ciets, \u0137\u012bmiski inerts materi\u0101ls, ko izmanto da\u017e\u0101dos veidos, tostarp smil\u0161u str\u016bklas uzga\u013cos un sl\u012bp\u0113\u0161anas ripas.<\/p>\n
Sil\u012bcija karb\u012bdu var apstr\u0101d\u0101t gan za\u013c\u0101, gan cepam\u0101 veid\u0101; tom\u0113r, lai sasniegtu prec\u012bzas pielaides, tas vispirms ir j\u0101sinterd\u0113 un j\u0101apstr\u0101d\u0101, izmantojot d\u0101rgus dimanta sl\u012bp\u0113\u0161anas procesus - kad tas ir paveikts, izgatavot\u0101s deta\u013cas b\u016bs izm\u0113ru zi\u0146\u0101 prec\u012bzas.<\/p>\n
Sil\u012bcija karb\u012bds ir inerts un \u0137\u012bmiski iztur\u012bgs keramikas materi\u0101ls ar augstu temperat\u016bras toleranci, kas saglab\u0101jas iztur\u012bgs pat 1400 gr\u0101du temperat\u016br\u0101, vienlaikus tas ir \u013coti iztur\u012bgs pret termisko \u0161oku un sk\u0101b\u0113m\/s\u0101rmiem\/izkaus\u0113tiem s\u0101\u013ciem.<\/p>\n
Kop\u0161 A\u010dons 1891. gad\u0101 pirmo reizi izgudroja m\u016bsdien\u012bgu sil\u012bcija karb\u012bda ra\u017eo\u0161anu, m\u016bsdienu SiC ra\u017eo\u0161ana ietver m\u0101la sajauk\u0161anu ar pulverveida koksu. P\u0113c sajauk\u0161anas \u0161o mais\u012bjumu saspie\u017e ap oglek\u013ca vad\u012bt\u0101ju elektrisk\u0101s pretest\u012bbas kr\u0101sn\u012b, kur caur to pl\u016bst elektrisk\u0101 str\u0101va, lai oglek\u013ca un sil\u012bcija atomi savienotos kop\u0101 SiC krist\u0101los, veidojot SiC krist\u0101lus.<\/p>\n
Sil\u012bcija karb\u012bda \u0101rk\u0101rt\u012bg\u0101 ciet\u012bba ir padar\u012bjusi to popul\u0101ru abraz\u012bvos izstr\u0101d\u0101jumos, piem\u0113ram, smil\u0161pap\u012br\u0101, sl\u012bp\u0113\u0161anas rip\u0101s un griez\u0113jinstrumentos. Turkl\u0101t sil\u012bcija karb\u012bdu var izmantot ar\u012b r\u016bpniecisko kr\u0101\u0161\u0146u ugunsiztur\u012bgajos oder\u0113jumos, k\u0101 ar\u012b s\u016bk\u0146u un ra\u0137e\u0161u dzin\u0113ju nodilumiztur\u012bgaj\u0101s deta\u013c\u0101s.<\/p>\n
Sil\u012bcija karb\u012bda pusvad\u012bt\u0101ji jau sen ir bijusi svar\u012bga elektronisko ier\u012b\u010du sast\u0101vda\u013ca. To augstsprieguma pretest\u012bba ir 10 rei\u017eu liel\u0101ka nek\u0101 gallija nitr\u012bda pretest\u012bba, un tie \u012bpa\u0161i labi darbojas pie 1000 V vai vair\u0101k spriegumiem.<\/p>\n
Sil\u012bcija karb\u012bda daudzpus\u012bba \u013cauj to izmantot ar\u012b daudziem citiem m\u0113r\u0137iem. Pateicoties t\u0101 form\u0113jam\u012bbai, no t\u0101 var izgatavot lo\u017eu necaur\u0161aujamas vestes, keramikas p\u0101rkl\u0101jumus, ko uzkl\u0101j ma\u0161\u012bnu deta\u013c\u0101m, piem\u0113ram, bremz\u0113m un saj\u016bgos, lai samazin\u0101tu berzi un pagarin\u0101tu to kalpo\u0161anas laiku, k\u0101 ar\u012b to izmanto k\u0101 spogu\u013cu materi\u0101lu da\u017eos liel\u0101kajos astronomiskajos teleskopos, kuru diametrs sasniedz 3,5 m (11 p\u0113du)! Izmantojot \u0137\u012bmisk\u0101s tvaiku kondens\u0101cijas tehnolo\u0123iju, no sil\u012bcija karb\u012bda ieg\u016bst spogu\u013cus ar lielisk\u0101m atstaro\u0161anas un stingr\u012bbas \u012bpa\u0161\u012bb\u0101m, ko var izmantot k\u0101 spogu\u013cu materi\u0101lu!<\/p>\n
Sil\u012bcija karb\u012bds (SiC) ir \u013coti iztur\u012bgs pret sk\u0101b\u0113m, s\u0101rmiem un \u0137\u012bmiskiem savienojumiem, k\u0101 ar\u012b pret augst\u0101m temperat\u016br\u0101m, t\u0101p\u0113c tas ir piem\u0113rots izmanto\u0161anai t\u0101d\u0101s nozar\u0113s k\u0101 metalur\u0123ija, abraz\u012bvie materi\u0101li un ugunsiztur\u012bgie materi\u0101li. SiC iztur\u012bbu pret koroziju nodro\u0161ina t\u0101 virsm\u0101 izveidojies adsorbcijas sl\u0101nis, kas absorb\u0113 sk\u0101bekli, lai pasarg\u0101tu to no iek\u013c\u016b\u0161anas iek\u0161pus\u0113 un \u0137\u012bmiskiem uzbrukumiem. Korozijas notur\u012bbu v\u0113l vair\u0101k uzlabo t\u0101 augst\u0101 ciet\u012bba, zemais termisk\u0101s izple\u0161an\u0101s koeficients un lab\u0101s stingr\u012bbas \u012bpa\u0161\u012bbas.<\/p>\n
Rupja sieta sil\u012bcija karb\u012bds, ko parasti izmanto met\u0101la deta\u013cu kodin\u0101\u0161anai un t\u012br\u012b\u0161anai, sp\u0113j dzi\u013ci kodin\u0101t to virsmas, vienlaikus att\u012brot no t\u0101m eso\u0161os pies\u0101r\u0146ojumus. \u0160is process ir neat\u0146emama atjauno\u0161anas procesa sast\u0101vda\u013ca, jo t\u0101 rezult\u0101t\u0101 met\u0101ls tiek atjaunots t\u0101 s\u0101kotn\u0113j\u0101 st\u0101vokl\u012b; atjauno\u0161anas nozar\u0113s izmanto ar\u012b rupja sieta sil\u012bcija karb\u012bda stingro virsmu, kas uz deta\u013c\u0101m rada rievas, lai kr\u0101sa \u0101tr\u0101k pieliptu.<\/p>\n
Reakcijas saist\u012btais sil\u012bcija karb\u012bds (RB SiC) un sil\u012bcija dioks\u012bda infiltr\u0101tais sil\u012bcija karb\u012bds (SSiC) ir divi visbie\u017e\u0101k ra\u017eotie sil\u012bcija karb\u012bda izstr\u0101d\u0101jumu veidi, kurus ra\u017eo, infiltr\u0113jot t\u012bra sil\u012bcija karb\u012bda pulveri ar sa\u0137epin\u0101\u0161anas pal\u012bgviel\u0101m, kas nav oks\u012bdi, un p\u0113c tam sa\u0137epinot \u013coti augst\u0101 temperat\u016br\u0101. Abi materi\u0101li ir \u0137\u012bmiski iztur\u012bgi: RB SiC ir \u012bpa\u0161i iztur\u012bgs pret fosforsk\u0101bi, s\u0113rsk\u0101bi un sl\u0101pek\u013csk\u0101bi, savuk\u0101rt SSiC nodro\u0161ina augst\u0101ku \u0137\u012bmisko aizsardz\u012bbu - \u012bpa\u0161i pret fosforsk\u0101bi, s\u0113rsk\u0101bi un sl\u0101pek\u013csk\u0101bi, vienlaikus izturot n\u0101trija hlor\u012bda un magnija nitr\u0101ta \u0161\u0137\u012bdumus.<\/p>\n
Sil\u012bcija karb\u012bds (SiC) ir viens no viegl\u0101kajiem, ciet\u0101kajiem un iztur\u012bg\u0101kajiem m\u016bsdien\u0101s tirg\u016b pieejamajiem keramikas materi\u0101liem. Tam piem\u012bt iespaid\u012bgas \u012bpa\u0161\u012bbas, piem\u0113ram, laba nodilumiztur\u012bba, \u0137\u012bmisk\u0101 inertums, iztur\u012bba augst\u0101 temperat\u016br\u0101 un sader\u012bba ar meh\u0101niskiem bl\u012bv\u0113jumiem, kas padara to piem\u0113rotu meh\u0101niskajiem bl\u012bv\u0113jumiem\/ gult\u0146iem\/ gult\u0146u korpusiem\/blasteru sprausl\u0101m utt.<\/p>\n
SiC ir sint\u0113tisks materi\u0101ls, kas ieg\u016bts, rea\u0123\u0113jot sil\u012bcijam ar oglekli elektrisk\u0101 loka kr\u0101sn\u012bs vai infiltr\u0113jot augstspiediena infiltr\u0101cij\u0101, t\u0101d\u0113j\u0101di ieg\u016bstot \u012bpa\u0161i iztur\u012bgu pret koroziju un oksid\u0101ciju materi\u0101lu, kas sp\u0113j iztur\u0113t augstas temperat\u016bras vidi, vienlaikus saglab\u0101jot iztur\u012bbu un iztur\u012bbu.<\/p>\n
SiC ir kubisks krist\u0101ls ar tetraedrisko saiti, kas tam pie\u0161\u0137ir izcilu ciet\u012bbu un iztur\u012bbu, k\u0101 ar\u012b polimorfu raksturu, kas noz\u012bm\u0113, ka da\u017e\u0101d\u0101s form\u0101s sil\u012bcija un oglek\u013ca atomu sak\u0101rtojums ir at\u0161\u0137ir\u012bgs.<\/p>\n
Sil\u012bcija karb\u012bds at\u0161\u0137iras no keramikas materi\u0101liem ar \u0101rk\u0101rt\u012bgi augstu stiepes iztur\u012bbu, ko nodro\u0161ina kovalent\u0101s saites, kas pal\u012bdz iztur\u0113t nodilumu un trieciena boj\u0101jumus, k\u0101 ar\u012b tas ir viens no nedaudzajiem materi\u0101liem, kas sp\u0113j iztur\u0113t augstu temperat\u016bru, nesamazinot iztur\u012bbu.<\/p>\n
Sil\u012bcija karb\u012bda liel\u0101 stiepes iztur\u012bba padara to piem\u0113rotu meh\u0101niskajiem bl\u012bv\u0113jumiem un gult\u0146iem, kuriem nepiecie\u0161ama zema nodiluma pak\u0101pe un lieliski berzes raksturlielumi, tostarp kompresijas, k\u0101 ar\u012b lieces vai v\u0113rpes sp\u0113ki. Rezult\u0101t\u0101 sil\u012bcija karb\u012bds ir \u013coti uzticams materi\u0101ls ar nep\u0101rsp\u0113jamu iztur\u012bbu pret saspie\u0161anas, k\u0101 ar\u012b lieces vai v\u0113rpes sp\u0113kiem, t\u0101p\u0113c tas ir \u013coti ieteicams.<\/p>\n
SiC deta\u013cas var iztur\u0113t abraziju, eroziju un koroziju da\u017e\u0101dos lietojumos; SiC var iztur\u0113t visu, s\u0101kot no \u0137\u012bmisko reaktoru abraz\u012bvaj\u0101m vid\u0113m un beidzot ar naftas r\u016bpn\u012bcu naftas d\u016b\u0146u s\u016bkn\u0113\u0161anu, necie\u0161ot no iev\u0113rojama nodiluma.<\/p>\n
Sil\u012bcija karb\u012bds ir viens no ciet\u0101kajiem un iztur\u012bg\u0101kajiem materi\u0101liem, k\u0101ds jebkad rad\u012bts. T\u0101 krist\u0101lisko strukt\u016bru veido vien\u0101das sil\u012bcija un oglek\u013ca atomu proporcijas, kas sav\u0101 starp\u0101 saist\u012bti tetraedr\u0101l\u0101s sait\u0113s; \u0161\u012b unik\u0101l\u0101 sai\u0161u konfigur\u0101cija nodro\u0161ina izcilu meh\u0101nisko iztur\u012bbu, nodilumiztur\u012bbu un nodilumiztur\u012bbu.<\/p>\n
Sil\u012bcija karb\u012bda keramikas iek\u0161\u0113j\u0101s uzmavas sp\u0113j iztur\u0113t ekstr\u0113mas temperat\u016bras un nodilumu bez plais\u0101m, ir \u0137\u012bmiski inertas un t\u0101m ir zems termisk\u0101s izple\u0161an\u0101s koeficients - \u0161\u012bs \u012bpa\u0161\u012bbas padara t\u0101s par lielisku izv\u0113li komponentiem, kuriem dro\u0161i j\u0101darbojas skarb\u0101s vid\u0113s, piem\u0113ram, r\u016bpniecisk\u0101s kr\u0101sn\u012bs. Sil\u012bcija karb\u012bda keramikas iek\u0161\u0113j\u0101s uzmavas var atrast k\u0101 ugunsiztur\u012bgus oder\u0113jumus r\u016bpnieciskaj\u0101s kr\u0101sn\u012bs, k\u0101 ar\u012b deg\u013cu sprausl\u0101s, str\u016bklu caurul\u0113s un liesmas caurul\u0113s, ko izmanto deg\u013cos, k\u0101 ar\u012b k\u0101 sl\u012bdo\u0161os gredzenus vai gult\u0146us sl\u012bp\u0113\u0161anas iek\u0101rt\u0101s, piem\u0113ram, sl\u012bdo\u0161os gredzenos vai gult\u0146os.<\/p>\n
Piln\u012bb\u0101 bl\u012bvs sa\u0137epin\u0101ts sil\u012bcija karb\u012bds ir ide\u0101ls materi\u0101ls, lai iztur\u0113tu naid\u012bgus \u0161\u0137idrumus augst\u0101 temperat\u016br\u0101. Lai to ieg\u016btu, t\u012bra sil\u012bcija karb\u012bda pulveris pirms bl\u012bv\u0113\u0161anas un form\u0113\u0161anas j\u0101infiltr\u0113 ar sa\u0137epin\u0101\u0161anas pal\u012bgviel\u0101m, kas nav oks\u012bdi, bet, veidojot aukst\u0101s izostatisk\u0101s pres\u0113\u0161anas pastas, var izmantot da\u017e\u0101das saistvielas. Turkl\u0101t, pievienojot graf\u012btu sa\u0137epin\u0101majam sil\u012bcija karb\u012bdam, ieg\u016bst kompoz\u012btmateri\u0101lu deta\u013cas ar uzlabot\u0101m tribolo\u0123iskaj\u0101m \u012bpa\u0161\u012bb\u0101m un e\u013c\u013co\u0161anas \u012bpa\u0161\u012bb\u0101m.<\/p>\n
T\u0101 ciet\u012bbas un apstr\u0101des sare\u017e\u0123\u012bt\u012bbas d\u0113\u013c sil\u012bcija karb\u012bda komponentiem nepiecie\u0161ama prec\u012bza sl\u012bp\u0113\u0161ana un pul\u0113\u0161ana ar dimanta smilt\u012bm, lai nodro\u0161in\u0101tu prec\u012bzas pielaides efekt\u012bvai ra\u017eo\u0161anai un test\u0113\u0161anai (nopl\u016bdes noteik\u0161anai, plaisu p\u0101rbaudei un spiediena test\u0113\u0161anai). Junty komandai ir gadiem ilga pieredze sil\u012bcija karb\u012bda komponentu ra\u017eo\u0161an\u0101; m\u016bsu in\u017eenieri var pal\u012bdz\u0113t jums izv\u0113l\u0113ties pareizo pak\u0101pi, kas atbilst j\u016bsu unik\u0101lajam lietojumam vai dizainam.<\/p>\n
Sil\u012bcija karb\u012bds (SiC) p\u0113c ciet\u012bbas ir otrs p\u0113c dimanta un bora karb\u012bda, t\u0101p\u0113c tas ir ide\u0101ls materi\u0101ls nodilumiztur\u012bg\u0101m deta\u013c\u0101m. Turkl\u0101t SiC nodro\u0161ina iztur\u012bbu pret koroziju, k\u0101 ar\u012b augstu termisko stabilit\u0101ti ar minim\u0101lu termisko izple\u0161anos - \u012bpa\u0161\u012bbas, kas ir padar\u012bju\u0161as to par popul\u0101ru izv\u0113li pusvad\u012bt\u0101ju ra\u017eo\u0161anas vid\u0113.<\/p>\n
SiC ir pieejams da\u017e\u0101d\u0101s form\u0101s, un katrai no t\u0101m ir at\u0161\u0137ir\u012bgs \u012bpa\u0161\u012bbu kopums, kas \u013cauj in\u017eenieriem izv\u0113l\u0113ties konkr\u0113tam uzdevumam vai pielietojumam vispiem\u0113rot\u0101ko materi\u0101lu. Piem\u0113ram, SiC stingr\u012bba padara to par piem\u0113rotu materi\u0101lu kosmosa ku\u0123u apak\u0161sist\u0113mu mont\u0101\u017eai, savuk\u0101rt t\u0101 liel\u0101 iztur\u012bba pret vibr\u0101cij\u0101m un augstu temperat\u016bru padara to par uzticamu materi\u0101lu.<\/p>\n
SiC var izmantot ar\u012b ener\u0123ijas ra\u017eo\u0161an\u0101, tostarp izol\u0101cijas un aizdedzes sve\u010du komponentos, kam j\u0101iztur ekstrem\u0101las temperat\u016bras un elektrisk\u0101 str\u0101va. SiC sp\u0113j iztur\u0113t gan augstas temperat\u016bras, gan elektriskos laukus, nepak\u013caujoties elektrisk\u0101s str\u0101vas vad\u012btsp\u0113jai caur spraug\u0101m vai plais\u0101m; t\u0101 bl\u012bvais sast\u0101vs ar\u012b samazina svaru, lai to var\u0113tu izmantot augstsprieguma lietojumos, piem\u0113ram, elektromobi\u013cu \u0101trai uzl\u0101dei.<\/p>\n
Matmatch uztur vair\u0101k nek\u0101 60 SiC materi\u0101lu un izstr\u0101d\u0101jumu ra\u017eot\u0101ju un izgatavot\u0101ju sarakstus vis\u0101 pasaul\u0113, kas pied\u0101v\u0101 da\u017e\u0101das \u0161\u012b materi\u0101la formas, piem\u0113ram, relat\u012bvi neatt\u012br\u012btu keramiku, kas izgatavota no SiC krist\u0101l\u012btiem, kas saist\u012bti kop\u0101 ar saistvielu, vai \u013coti t\u012bras monokrist\u0101lu pl\u0101ksnes. Daudziem ra\u017eot\u0101jiem ir ar\u012b r\u016bpn\u012bcas, kas nodarbojas ar SiC apstr\u0101di atbilsto\u0161i klientu specifik\u0101cij\u0101m; piem\u0113ram, Elkem Processing Services (EPS) r\u016bpn\u012bca Lje\u017e\u0101, Be\u013c\u0123ij\u0101, pied\u0101v\u0101 piel\u0101gotus SiC produktus, kas piel\u0101goti tie\u0161i klientu pas\u016bt\u012bjumiem; vi\u0146i ieg\u016bst neapstr\u0101d\u0101tu SiC materi\u0101lu, sagatavo to atbilsto\u0161i konkr\u0113tiem parametriem un p\u0113c tam iepako to pirms nos\u016bt\u012b\u0161anas.<\/p>","protected":false},"excerpt":{"rendered":"
Silicon carbide, commonly referred to as SSiC, is a hard, chemically inert material used in various applications including sandblasting nozzles and grinding wheels. Silicon Carbide can be machined in either its green or biscuit state; however, for precise tolerances to be reached it must first be sintered and processed using costly diamond grinding processes – …<\/p>\n