Yawan sinadarin carbon a kowace karayar samfurin da aka yi da siminti ya bambanta, tare da sinadarin carbon na A-2.5 a kowace lita a cikin wannan kewayon, yana samar da wani abu mai kauri wanda kusan babu ramuka, wanda ya ƙunshi ƙwayoyin silicon carbide da aka rarraba iri ɗaya da kuma silicon kyauta. Tare da ƙaruwar ƙarin carbon, yawan sinadarin silicon carbide da aka yi da siminti yana ƙaruwa a hankali, girman ƙwayar silicon carbide yana ƙaruwa, kuma silicon carbide yana haɗuwa da juna a cikin siffar kwarangwal. Duk da haka, yawan sinadarin carbon zai iya haifar da ragowar carbon a cikin jikin da aka yi da siminti. Lokacin da aka ƙara yawan baƙin carbon zuwa 3a, simintin samfurin bai cika ba, kuma "tsakanin layuka" baƙi suna bayyana a ciki.
Idan carbon ya yi aiki da silicon da aka narke, yawan faɗaɗar sa ya kai kashi 234%, wanda hakan ke sa tsarin silin carbide mai narkewar amsawa ya yi kama da na carbon da ke cikin billet ɗin. Lokacin da sinadarin carbon da ke cikin billet ɗin ya yi ƙanƙanta, sinadarin silicon carbide da sinadarin silicon carbide da ke samarwa bai isa ya cika ramukan da ke kewaye da foda carbon ɗin ba, wanda hakan ke haifar da yawan silicon kyauta a cikin samfurin. Tare da ƙaruwar sinadarin carbon a cikin billet ɗin, sinadarin silicon carbide da ke narkewar amsawa zai iya cika ramukan da ke kewaye da foda carbon ɗin gaba ɗaya kuma ya haɗa ainihin silicon carbide ɗin tare. A wannan lokacin, sinadarin silicon kyauta a cikin samfurin yana raguwa kuma yawan sinadarin silicon yana ƙaruwa. Duk da haka, lokacin da akwai ƙarin carbon a cikin billet ɗin, sinadarin silicon carbide na biyu da ke fitowa daga amsawar da ke tsakanin carbon da silicon yana kewaye toner ɗin da sauri, wanda hakan ke sa silicon mai narkewa ya yi wahala ya taɓa toner ɗin, wanda ke haifar da ragowar carbon a cikin jikin da aka narke.
Dangane da sakamakon XRD, tsarin sic mai narkewar amsawa shine α-SiC, β-SiC da silicon kyauta.
A cikin tsarin haɗakar sinadarin iskar oxygen mai zafi, ƙwayoyin carbon suna ƙaura zuwa yanayin farko akan saman SiC β-SiC ta hanyar samuwar silicon α-secondary silicon. Tunda amsawar silicon-carbon wani nau'in amsawar zafi ne na waje wanda ke da yawan zafin amsawa, saurin sanyaya bayan ɗan gajeren lokaci na amsawar zafi mai sauri yana ƙara yawan carbon da ke narkewa a cikin silicon mai ruwa, don haka ƙwayoyin β-SiC sun fashe a cikin nau'in carbon, don haka inganta halayen injiniya na kayan. Saboda haka, gyaran hatsi na β-SiC na biyu yana da amfani ga inganta ƙarfin lanƙwasawa. A cikin tsarin haɗakar Si-SiC, abun ciki na silicon kyauta a cikin kayan yana raguwa tare da ƙaruwar abun ciki na carbon a cikin kayan.
Kammalawa:
(1) Danko na slurry mai amsawa da aka shirya yana ƙaruwa tare da ƙaruwar adadin carbon black; ƙimar pH alkaline ce kuma a hankali tana ƙaruwa.
(2) Tare da ƙaruwar yawan sinadarin carbon a jiki, yawan da ƙarfin lanƙwasa na yumbun da aka haɗa da sinadarin reactions da aka shirya ta hanyar matsewa da farko ya ƙaru sannan ya ragu. Lokacin da adadin carbon black ya ninka sau 2.5 na adadin farko, ƙarfin lanƙwasa maki uku da yawan yawa na kore billet bayan reactions sintering suna da yawa sosai, waɗanda sune 227.5mpa da 3.093g/cm3, bi da bi.
(3) Idan jikin da ke da yawan carbon ya shiga cikin ruwa, tsagewa da wuraren "sandwich" baƙi za su bayyana a jikin jiki. Dalilin tsagewar shine iskar silicon oxide da aka samar a lokacin da ake yin simintin ...
Lokacin Saƙo: Yuli-10-2023