{"id":216,"date":"2023-08-24T13:48:37","date_gmt":"2023-08-24T05:48:37","guid":{"rendered":"https:\/\/advance-ceramics.com\/?p=216"},"modified":"2023-08-24T14:00:36","modified_gmt":"2023-08-24T06:00:36","slug":"prasky-karbidu-kremiku","status":"publish","type":"post","link":"https:\/\/advance-ceramics.com\/cs\/silicon-carbide-powders\/","title":{"rendered":"pr\u00e1\u0161ky karbidu k\u0159em\u00edku"},"content":{"rendered":"<p>\u010cern\u00fd karbid k\u0159em\u00edku se tav\u00ed s k\u0159emenn\u00fdm p\u00edskem, ropn\u00fdm koksem (nebo antracitem) a dal\u0161\u00edmi surovinami ve vysokoteplotn\u00ed odporov\u00e9 peci o teplot\u011b 2600-2700 \u2103 a pot\u00e9 se ochlad\u00ed, aby se z\u00edskal p\u016fvodn\u00ed blok \u010dern\u00e9ho karbidu k\u0159em\u00edku, p\u016fvodn\u00ed blok \u010dern\u00e9ho karbidu k\u0159em\u00edku se rozdrt\u00ed drti\u010dem, kulov\u00fd ml\u00fdn se nad\u00e1le jemn\u011b mele, aby se z\u00edskal jemn\u00fd pr\u00e1\u0161ek. Jemn\u00fd pr\u00e1\u0161ek se vezme jako surovina, pomoc\u00ed p\u0159epadov\u00e9 n\u00e1dr\u017ee se p\u0159id\u00e1 velk\u00e9 mno\u017estv\u00ed vody, spol\u00e9h\u00e1 se na vztlak vody, aby se p\u0159esn\u011b kontroloval \u010das, vyt\u00e1hnou se r\u016fzn\u00e9 druhy mikropr\u00e1\u0161ku \u010dern\u00e9ho karbidu k\u0159em\u00edku v r\u016fzn\u00fdch \u010dasech, vysr\u00e1\u017e\u00ed se, su\u0161\u00ed se p\u0159i vysok\u00e9 teplot\u011b, pros\u00e9v\u00e1 se voln\u011b a nakonec se zabal\u00ed do skladu.<\/p>\n<p>Tento pr\u00e1\u0161ek karbidu k\u0159em\u00edku je \u010dern\u00fd nepr\u016fhledn\u00fd hexagon\u00e1ln\u00ed krystal, tvrdost podle Mohse je 9,2, druh\u00fd po diamantu a karbidu boru, v\u00fdkon je k\u0159ehk\u00fd a ostr\u00fd a m\u00e1 ur\u010ditou vodivost. Tento karbid k\u0159em\u00edku v pr\u00e1\u0161ku obsahuje SiC v\u00edce ne\u017e 98,5%, jeho hou\u017eevnatost je vy\u0161\u0161\u00ed ne\u017e u zelen\u00e9ho karbidu k\u0159em\u00edku, v\u011bt\u0161inou se pou\u017e\u00edv\u00e1 pro zpracov\u00e1n\u00ed materi\u00e1l\u016f s n\u00edzkou pevnost\u00ed v tahu, jako je sklo, keramika, k\u00e1men, \u017e\u00e1ruvzdorn\u00e9 materi\u00e1ly, litina a ne\u017eelezn\u00e9 kovy, optick\u00e9 sklo, keramika a dal\u0161\u00ed nekovov\u00e9 materi\u00e1ly.<\/p>\n<p>Metoda vypalov\u00e1n\u00ed karbidu k\u0159em\u00edku p\u0159i vysok\u00fdch teplot\u00e1ch b\u011b\u017en\u011b zn\u00e1m\u00e1 jako: vypalov\u00e1n\u00ed poh\u0159ben\u00e9ho pr\u00e1\u0161ku. Jedn\u00e1 se o v\u00fdkon, kter\u00fd je na za\u010d\u00e1tku oh\u0159evu, teplota j\u00e1dra pece asi 2500 \u2103, nebo dokonce vy\u0161\u0161\u00ed (2600 ~ 2700 \u2103), n\u00e1pl\u0148 dosahuje 1450 \u2103, kdy\u017e za\u010d\u00edn\u00e1 synt\u00e9za SiC (ale SiC je hlavn\u011b v \u2265 1800 \u2103 p\u0159i tvorb\u011b) a uvol\u0148ov\u00e1n\u00ed CO. Teplota je v\u0161ak vy\u0161\u0161\u00ed ne\u017e 2600 \u2103, kdy\u017e se SiC bude rozkl\u00e1dat, ale rozklad Si a n\u00e1boj v SiC generace C. Ka\u017ed\u00e1 skupina pec\u00ed s Ka\u017ed\u00e1 skupina elektrick\u00fdch pec\u00ed je vybavena sadou transform\u00e1tor\u016f, ale v\u00fdroba pouze jedin\u00e9ho nap\u00e1jen\u00ed pece, aby bylo mo\u017en\u00e9 upravit nap\u011bt\u00ed podle charakteristik elektrick\u00e9ho zat\u00ed\u017een\u00ed a udr\u017eet tak v podstat\u011b konstantn\u00ed v\u00fdkon, vysokov\u00fdkonn\u00e1 elektrick\u00e1 pec se zah\u0159\u00edv\u00e1 po dobu asi 24 hodin, po v\u00fdpadku reakce na generov\u00e1n\u00ed SiC v podstat\u011b skon\u010d\u00ed, a pak se po ur\u010dit\u00e9 dob\u011b chlazen\u00ed m\u016f\u017ee odstranit z bo\u010dn\u00ed st\u011bny a pak postupn\u011b vyjmout z pece n\u00e1lo\u017e. P\u0159\u00edprava tohoto pr\u00e1\u0161ku karbidu k\u0159em\u00edku se prov\u00e1d\u00ed hlavn\u011b taven\u00edm k\u0159emene a ropn\u00e9ho dehtu za vysok\u00fdch teplot, tak\u017ee po\u017eadavek na teplotu je vysok\u00fd, pokud teplota neodpov\u00edd\u00e1 po\u017eadavku, budou vznikat ne\u010distoty, tak\u017ee podnik by m\u011bl b\u00fdt v t\u00e9to technologii zb\u011bhl\u00fd.<\/p>\n<p><a href=\"https:\/\/advance-ceramics.com\/cs\/prasky-karbidu-kremiku\/prasky-karbidu-kremiku\/\" rel=\"attachment wp-att-217\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-217\" src=\"http:\/\/advance-ceramics.com\/wp-content\/uploads\/2023\/08\/silicon-carbide-powders.jpg\" alt=\"pr\u00e1\u0161ky karbidu k\u0159em\u00edku\" width=\"949\" height=\"949\" srcset=\"https:\/\/advance-ceramics.com\/wp-content\/uploads\/2023\/08\/silicon-carbide-powders.jpg 949w, https:\/\/advance-ceramics.com\/wp-content\/uploads\/2023\/08\/silicon-carbide-powders-300x300.jpg 300w, https:\/\/advance-ceramics.com\/wp-content\/uploads\/2023\/08\/silicon-carbide-powders-150x150.jpg 150w, https:\/\/advance-ceramics.com\/wp-content\/uploads\/2023\/08\/silicon-carbide-powders-768x768.jpg 768w\" sizes=\"(max-width: 949px) 100vw, 949px\" \/><\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Black silicon carbide is smelted with quartz sand, petroleum coke (or anthracite) and other raw materials in the 2600-2700 \u2103 high temperature resistance furnace and then cooled so as to get the original black silicon carbide block, the original black silicon carbide block is crushed by the crusher, the ball mill continues to be finely&hellip;&nbsp;<a href=\"https:\/\/advance-ceramics.com\/cs\/silicon-carbide-powders\/\" class=\"\" rel=\"bookmark\">\u010c\u00edst d\u00e1le &raquo;<span class=\"screen-reader-text\">pr\u00e1\u0161ky karbidu k\u0159em\u00edku<\/span><\/a><\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"off","neve_meta_content_width":70,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[15],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/advance-ceramics.com\/cs\/wp-json\/wp\/v2\/posts\/216"}],"collection":[{"href":"https:\/\/advance-ceramics.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/advance-ceramics.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/advance-ceramics.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/advance-ceramics.com\/cs\/wp-json\/wp\/v2\/comments?post=216"}],"version-history":[{"count":4,"href":"https:\/\/advance-ceramics.com\/cs\/wp-json\/wp\/v2\/posts\/216\/revisions"}],"predecessor-version":[{"id":221,"href":"https:\/\/advance-ceramics.com\/cs\/wp-json\/wp\/v2\/posts\/216\/revisions\/221"}],"wp:attachment":[{"href":"https:\/\/advance-ceramics.com\/cs\/wp-json\/wp\/v2\/media?parent=216"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/advance-ceramics.com\/cs\/wp-json\/wp\/v2\/categories?post=216"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/advance-ceramics.com\/cs\/wp-json\/wp\/v2\/tags?post=216"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}