A aikina na \u0199wararren masanin kayan wuta da na yi sama da shekaru 20, na ga sabbin \u0199ir\u0199ira da dama suna zuwa suna wucewa. Amma silicon carbide da aka ha\u0257a da nitride? Wannan shi ne \u0257aya daga cikin wa\u0257anda suka tsaya, kuma da dalili mai kyau. Shi ne kayan da kake komawa gare shi idan zafin ya yi yawa, tsatsa ta yi \u0199arfi, kuma kana bu\u0199atar wani abu da ba zai daina aiki a tsakiyar aikin samarwa ba. Ana yawan gajarta shi da NBSiC ko kuma SiC nitride bonded, wannan kayan hana \u0199onewa ya ha\u0257a \u0199arfi da juriya na silicon carbide da \u0199arfin ha\u0257awa na silicon nitride don samar da samfur mai \u0199arfi, inganci, kuma mai matu\u0199ar amfani a fannoni da dama. Ko da ba shi ne za\u0253i mafi jan hankali ba, yadda yake aiki a ainihin yanayi ya sa ya zama abin so ga injiniyoyi a fannin sarrafa \u0199arfe, keramiki, da sauran fannoni. Mu yi nazari dalla-dalla kan abin da ke sa shi ya yi aiki\u2014daga yadda aka ha\u0257a shi zuwa inda yake yin fice, har ma da matsalolin da ya kamata ka kula da su. Idan kana za\u0253ar kayan aiki don ayyukan zafi mai yawa, wannan na iya taimaka maka ka yanke shawara ko shi ne ya dace.<\/p>\n
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Ginshikin silicon carbide da aka ha\u0257a da nitride ya ta'allaka ne ga sinadaran asali da kuma hikimar yadda aka ha\u0257a su. Dukkan abin ya fara ne da \u0199wayoyin silicon carbide, wa\u0257anda ake samarwa ta hanyar tsarin Acheson na gargajiya: dumama ha\u0257in yashi mai silica da carbon zuwa matu\u0199ar zafi, sama da 2000\u00b0C, a cikin tanda mai arc na lantarki. Wannan yana samar da wa\u0257annan \u0199wayoyin SiC masu \u0199arfi da tsari na kristal, wa\u0257anda aka san su da \u0257orewarsu. Don ha\u0257a su, masana'antun suna ha\u0257a foda siliki sannan su siffanta ha\u0257in zuwa siffofi kamar tubalan ko bututu. Sannan sai mataki mafi muhimmanci\u2014gasa a cikin yanayin nitrogen a zafin jiki na 1400 zuwa 1500\u00b0C. A nan, silicon na ha\u0257uwa da nitrogen don samar da silicon nitride (Si3N4), wanda ke girma a matsayin cibiyar \u0199ananan kristaloli masu ha\u0257a \u0199wayoyin SiC a wurinsu. Sakamakon haka shi ne ha\u0257adden abu inda SiC ke \u0257aukar kashi 80% ko fiye na yawan sa, yayin da nitride ke aiki a matsayin mai ha\u0257awa mai \u0199arfi da muhimmanci. Ba a bu\u0199atar \u0199arin manne ko laka, wanda ke sa abubuwa su kasance masu tsarki kuma masu aiki sosai. Idan ka duba \u0199ananan tsarin, abin birgewa ne: Si3N4 yana bayyana a matsayin gashi masu tsawo da suka yi lan\u0199wasa da \u0199wayoyin SiC masu siffar tubali, suna \u0199ir\u0199irar matris mai cunkoso amma mai ramuka da aka sarrafa.<\/p>\n
Dangane da kaddarori, wannan kayan yana da \u0199arfi sosai a fannoni da dama masu muhimmanci. A bangaren zafi, zai iya jure zafin aiki har zuwa 1650\u00b0C a yanayi mai haifar da oksida, kuma wani lokaci ma fi haka a yanayi mai rage oksida. A yayin da aka fallasa shi ga iska, wani fim na silika mai kariya yana samuwa a saman sa, yana toshe shi daga \u0199arin rushewa. Haka kuma, gagarumar gagarumin gudanar da zafi\u2014yawanci 20 zuwa 40 W\/m\u00b7K\u2014tana da matu\u0199ar amfani a aikace-aikacen da ke bu\u0199atar rarraba zafi daidai, kamar a na'urorin dumama. Tare da \u0199imar fa\u0257a\u0257a zafi kusan 4.0 x 10^-6 a kowane \u00b0C, yana jure matsin lamba na saurin dumama da sanyaya wa\u0257anda za su iya karya wasu za\u0253u\u0253\u0253uka masu rauni. A bangaren injiniya, \u0199arfin matsawa sau da yawa yakan wuce 200 MPa, kuma juriya ga gogayya tana daga mafi inganci, godiya ga \u0199imar tauri na SiC da ke kusa da na lu'u-lu'u. Na gudanar da gwaje-gwaje inda samfura suka jure zubewar slag da aka kwaikwayo wanda zai cinye bulo-bulo na alumina a rabi lokacin.<\/p>\n
Sannan akwai juriya ta sinadarai. SiC da aka ha\u0257a da nitride yana jure wa nau'o'in masu lalata da dama\u2014acid, baz, \u0199arafa masu narke, da gishiri. A misali, a lokacin narke aluminium, yana kare kansa daga hare-haren fluoride da ke lalata sauran kayan wuta masu juriya. Kaurin wannan kayan yana tsakanin 2.7 da 3.1 g\/cm\u00b3, wanda ke sa shi ya fi yawancin seramiki masu nauyi haske, abin da ke sau\u0199a\u0199a girkawa a manyan gine-gine. Yawan ramuka yawanci yana tsakanin 10-20%, wanda ke ba da damar \u0257an yawo na iskar gas ba tare da raunana duka ba. Amma ya kamata a lura cewa a yanayi mai danshi da zafin gaske sama da 1400\u00b0C, matakin nitride na iya rushewa ta ruwa, wanda ke haifar da lalacewa. Don haka, abubuwan muhalli suna taka muhimmiyar rawa wajen tsawon rayuwarsa.<\/p>\n
Idan ana maganar aikace-aikace, SiC da aka ha\u0257a da nitride yana haskakawa a muhallai inda gazawa ba za ta yiwu ba. A masana'antar \u0199arfe, ana amfani da shi sosai wajen rufin tanda mai fashewa, musamman a \u0199ananan bututun hayaki da wuraren \u0199asa na tanda da ke fuskantar zafi mai tsanani da bugun injiniya. Na ta\u0253a ba da shawara kan sake shimfi\u0257a inda amfani da SiC ya tsawaita aikin daga watanni 8 zuwa sama da shekaru 2, yana rage ku\u0257a\u0257e sosai. Ga \u0199ananan \u0199arfe marasa ferros kamar tagulla ko zinc, ana amfani da shi a cikin tukwane na narkewa, magudanun fitar da \u0199arfe, da magudanun taruwa; saman sa ba ya manne da sau\u0199i, don haka \u0199arfe ba ya manne kuma ba ya haifar da toshewa. A masana'antar kayan yumbu, yana aiki a matsayin matattara da tallafi na murhu, yana jure sake-sake na gasa ba tare da lankwasawa ba.<\/p>\n
Banda masana'antu na gargajiya, za ka same shi a cikin masana'antun mayar da sharar gida zuwa makamashi da ke kewaye da na'urorin \u0199onawa don hana hayaki mai lalata, ko a cikin sarrafa sinadarai don tukwane da ke \u0257aukar abubuwan da ke da saurin maye. Kwanan nan, ana ganinsa a cikin tsarin makamashi na ci gaba, kamar reaktocin syngas ko na'urorin tara hasken rana. Siffarsa tana da sassauci\u2014ana matsa shi zuwa bulo na al'ada ko siffofi na musamman, tare da girma-girma daban-daban. A lokacin girkawa, ha\u0257a shi da siminti masu dacewa da SiC don samun sakamako mafi kyau. Farashi? Yafi tsada fiye da bulo na wuta na yau da kullum, watakila $5\u201310 kowace kilo, amma a wuraren da ake yawan lalacewa, yana dawo da kansa cikin sauri ta hanyar rage gyara.<\/p>\n
Tabbas, kamar kowanne kayan, yana da iyakokinsa. Tsarin kera yana bu\u0199atar daidaito; idan nitridation bai kammala ba, za ka iya samun wurare masu rauni da ke da sau\u0199in lalacewa. Sarrafawa da aikin injina suna haifar da \u0199ura wadda ke zama barazana ga lafiya\u2014za ta iya haifar da ciwon daji\u2014don haka koyaushe a dage kan kyakkyawan sarrafa \u0199ura da kayan kariya. Daga mahangar muhalli, kera shi na cinye yawan makamashi, amma ci gaban sake sarrafawa yana taimakawa: wasu ayyuka suna dawo da kashi 60\u201370% na SiC daga tsofaffin layuka. Ci gaban nan gaba ya ha\u0257a da nau'uka masu \u0199arfi tare da \u0199arin zaren auduga don \u0199arin juriya ga fashewa, ko ma sassa da aka buga a 3D don rage sharar gida.<\/p>\n
A ta\u0199aice, silicon carbide da aka ha\u0257a da nitride ba wai wata \u0199arin kayan jure zafi ba ne kawai\u2014shi ne abokin aikin da aka tabbatar wajen magance mafi \u0199alubalen zafi da na sinadarai. Dangane da \u0199warewata a fagen, shi ne za\u0253i da sau da yawa ke sa ayyuka marasa inganci su zama masu inganci, kamar a masana'antar aluminium inda ya ninka rayuwar tukunyar narkewa. Idan kuna tunanin amfani da shi, ku tantance yanayinku da kyau\u2014zazzabi, fuskantar sinadarai, matsin lamba na injiniya\u2014ku kuma duba ka'idojin da suka dace kamar ASTM C863. Ku tuntu\u0253i manyan masana'antun samarwa kamar Saint-Gobain ko ESK Ceramics don \u0199arin bayani. A cikin \u0199o\u0199arin samar da masana'antu masu dorewa a yau, kayan irin wannan suna da muhimmanci, suna ha\u0257a amintuwa da yiwuwar samun ci gaba mafi girma.<\/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\/ha\/wp-json\/wp\/v2\/posts\/49","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nitridebondedsic.com\/ha\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nitridebondedsic.com\/ha\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nitridebondedsic.com\/ha\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nitridebondedsic.com\/ha\/wp-json\/wp\/v2\/comments?post=49"}],"version-history":[{"count":3,"href":"https:\/\/nitridebondedsic.com\/ha\/wp-json\/wp\/v2\/posts\/49\/revisions"}],"predecessor-version":[{"id":52,"href":"https:\/\/nitridebondedsic.com\/ha\/wp-json\/wp\/v2\/posts\/49\/revisions\/52"}],"wp:attachment":[{"href":"https:\/\/nitridebondedsic.com\/ha\/wp-json\/wp\/v2\/media?parent=49"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nitridebondedsic.com\/ha\/wp-json\/wp\/v2\/categories?post=49"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nitridebondedsic.com\/ha\/wp-json\/wp\/v2\/tags?post=49"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}