Tukwanen silicon carbide suna da ƙarfin zafin jiki mai yawa, juriya ga iskar shaka mai yawa, juriya ga lalacewa mai kyau, kwanciyar hankali mai kyau na zafi, ƙaramin adadin faɗaɗa zafi, ƙarfin watsa zafi mai yawa, juriya ga girgizar zafi, juriya ga lalata sinadarai da sauran kyawawan halaye. An yi amfani da shi sosai a cikin motoci, injina, kariyar muhalli, fasahar sararin samaniya, na'urorin lantarki na bayanai, makamashi da sauran fannoni, kuma ya zama yumbu mai tsari wanda ba za a iya maye gurbinsa ba tare da kyakkyawan aiki a fannoni da yawa na masana'antu. Yanzu bari in nuna muku!
Yin siminti ba tare da matsi ba
Ana ɗaukar yin simintin da ba shi da matsi a matsayin hanya mafi kyau ta yin simintin SiC. Dangane da hanyoyin yin simintin da suka bambanta, ana iya raba simintin da ba shi da matsi zuwa simintin da ke da ƙarfi da kuma simintin ruwa-lokaci. Ta hanyar β-A mai kyau sosai an ƙara adadin B da C (abin da ke cikin iskar oxygen ƙasa da 2%) a cikin foda na SiC a lokaci guda, kuma an haɗa s. proehazka zuwa jikin simintin SiC tare da yawan da ya fi 98% a 2020 ℃. A. Mulla et al. An yi amfani da Al2O3 da Y2O3 azaman ƙari kuma an yi simintin a 1850-1950 ℃ na 0.5 μm β-SiC (surface na barbashi ya ƙunshi ƙaramin adadin SiO2). Yawan da aka samu na simintin SiC ya fi 95% na yawan ka'idar, kuma girman hatsi ƙarami ne kuma matsakaicin girmansa. Yana da microns 1.5.
Yin amfani da sintering mai zafi
Za a iya yin simintin SiC mai tsarki a cikin ƙaramin zafi kawai ba tare da wani ƙarin simintin ba, don haka mutane da yawa suna aiwatar da tsarin simintin simintin zafi don SiC. Akwai rahotanni da yawa game da simintin simintin zafi na SiC ta hanyar ƙara kayan taimako na simintin. Alliegro et al. Sun yi nazarin tasirin boron, aluminum, nickel, iron, chromium da sauran ƙarin ƙarfe akan simintin siC. Sakamakon ya nuna cewa aluminum da iron sune mafi inganci ƙari don haɓaka simintin siC mai zafi. Fflange ya yi nazarin tasirin ƙara adadin Al2O3 daban-daban akan halayen SiC mai zafi. Ana tsammanin cewa simintin siC mai zafi yana da alaƙa da tsarin narkewa da hazo. Duk da haka, tsarin simintin simintin zafi zai iya samar da sassan SiC kawai tare da siffa mai sauƙi. Adadin samfuran da aka samar ta hanyar simintin simintin zafi na lokaci ɗaya ƙanƙanta ne, wanda ba ya da amfani ga samar da masana'antu.
Zafi mai matsi mai isostatic
Domin shawo kan kurakuran tsarin sintering na gargajiya, an yi amfani da nau'in B da nau'in C a matsayin ƙari kuma an ɗauki fasahar sintering mai zafi mai isostatic. A zafin jiki na 1900 ° C, an sami kyawawan yumbu masu lu'ulu'u masu yawa fiye da 98, kuma ƙarfin lanƙwasawa a zafin ɗaki zai iya kaiwa 600 MPa. Duk da cewa sintering mai zafi mai isostatic na iya samar da samfuran matakai masu yawa tare da siffofi masu rikitarwa da kyawawan halayen injiniya, dole ne a rufe sintering ɗin, wanda ke da wuya a cimma samar da masana'antu.
Yin simintin amsawa
Carbide mai sintered silicon carbide, wanda aka fi sani da carbide mai sintered silicon carbide, yana nufin tsarin da billet mai ramuka ke amsawa da iskar gas ko ruwa don inganta ingancin billet, rage porosity, da samfuran da aka gama da sinter tare da wani ƙarfi da daidaiton girma. Ana haɗa foda α-SiC da graphite a wani rabo kuma ana dumama shi zuwa kusan 1650 ℃ don samar da billet mai murabba'i. A lokaci guda, yana shiga ko shiga cikin billet ɗin ta hanyar Si mai iskar gas kuma yana amsawa da graphite don samar da β-SiC, tare da ƙwayoyin α-SiC da ke akwai. Lokacin da Si ya shiga gaba ɗaya, ana iya samun jikin da aka haɗa da cikakken yawa da girman da ba ya raguwa. Idan aka kwatanta da sauran hanyoyin sintering, canjin girman sintering na sintering a cikin tsarin distinguishing ƙarami ne, kuma ana iya shirya samfuran da girmansu ya dace. Duk da haka, kasancewar babban adadin SiC a cikin jikin da aka haɗa yana sa halayen zafin jiki mai yawa na sintered SiC yumbu sun fi muni.
Lokacin Saƙo: Yuni-08-2022