[Incazelo efingqiwe] Umfutho womkhathi we-sinteredi-silicon carbideiyi-carbide engeyona eyensimbi ehlanganiswe ne-silicon ne-carbon covalent bond, futhi ubulukhuni bayo bungokwesibili ngemuva kwedayimane ne-boron carbide. Ifomula yamakhemikhali i-SiC. Amakristalu angenambala, aluhlaza okwesibhakabhaka nokumnyama uma efakwe i-oxid noma iqukethe ukungcola.
Umfutho we-atmospheric sinteredi-silicon carbideiyi-carbide engeyona eyensimbi ene-silicon ne-carbon covalent bond, futhi ubulukhuni bayo bungokwesibili ngemva kwedayimane ne-boron carbide. Ifomula yamakhemikhali i-SiC. Amakristalu angenambala, aluhlaza okwesibhakabhaka nokumnyama uma efakwe i-oxid noma iqukethe ukungcola. Ukuguqulwa kwei-silicon carbidengesakhiwo sedayimane ngokuvamile sibizwa nge-emery. Ukuqina kwe-emery kuseduze nedayimane, ukuzinza okuhle kokushisa, kuzinzile ku-hydroxy acid isixazululo se-aqueous kanye ne-sulfuric acid egxilile, futhi ayizinzile ku-asidi exutshwe noma i-phosphoric acid ye-concentrated hydrogen acid ne-nitric acid. Ama-alkali ancibilika emkhathini ongenalutho ayahlukanisa. Ihlukaniswe yaba zokwenziwai-silicon carbidekanye ne-silicon carbide yemvelo. I-silicon carbide yemvelo, eyaziwa ngokuthi i-carbonite, itholakala kakhulu ku-kimberlite ne-volcanic amphibolite, kodwa inani layo lincane futhi alinalo inani lokumba.
Ingcindezi ye-Industrial atmospheric sinteredi-silicon carbideiyingxube ka -SiC kanye no -SiC futhi iza ngemibala emibili: omnyama noluhlaza. I-silicon carbide ehlanzekile ayinambala, equkethe ukungcola okumnyama, okuluhlaza okotshani, okuluhlaza okwesibhakabhaka, okuphuzi. Imingcele yokusanhlamvu eyi-hexagonal kanye ne-cubic, i-crystal iyipuleti, ikholomu ehlanganisiwe. Ukucwebezela kwengilazi, ukuminyana okungu-3.17-3.47G/CM3, ubulukhuni be-Morse 9.2, isibonakhulu futhi ku-30380~ 33320MPa indawo yokuncibilika: umkhathi 2050 waqala ukuhlukanisa, umkhathi wokutakula 2600 waqala ukuhlukanisa. I-elastic coefficient ingu-466, 480MPa. Amandla we-tensile ngu-171.5MPa. Amandla okucindezela yi-1029MPa. I-coefficient yomugqa wokunweba ngu-(25~ 1000)5.010 ~ 6/, kanye ne-thermal conductivity (20) ngu-59w/(mk). Ukuzinza kwamakhemikhali, ukubilisa ku-HCI, H2SO4, HF ngeke kuguguleke.
Ngokusho kokusetshenziswa okuhlukile, i-atmospheric pressure sintered silicon carbide ihlukaniswe yaba i-abrasive, idatha ephikisayo, i-deoxidizer, i-silicon carbide kagesi nokunye. Okuqukethwe kwe-SiC ye-abrasive silicon carbide akufanele kube ngaphansi kwama-98%. Ama-refractory ane-silicon carbide ahlukaniswe abe: (1) idatha ye-refractory ethuthukisiwe i-silicon carbide, okuqukethwe kwayo kwe-SiC kufana ncamashi nokugaya i-silicon carbide. (2) Idatha yesibili ephikisayo ye-silicon carbide emnyama, okuqukethwe kwe-SiC okungaphezu kwama-90%. (3) Okuqukethwe kwe-silicon carbide emnyama kanye ne-SiC kuma-refractories asezingeni eliphansi akukhona ngaphansi kwama-83%. Okuqukethwe kwe-silicon carbide ne-SiC esetshenziswa ku-deoxidizer ngokuvamile kuyadingeka ukuthi kube ngaphezu kwama-90%. Kodwa-ke, i-carbon industrial graphitization furnace insulation, i-silicon carbide content engaphezu kuka-45% yokwelashwa ingasetshenziswa njenge-steelmaking deoxidizer. I-silicon carbide ye-ejenti ye-deoxidizing inezinhlobo ezimbili ze-powder shape kanye ne-molding block. I-powder deoxidizer black silicon carbide ngokuvamile inosayizi wezinhlayiyana ongu-4~0.5 mm no-0.5~0.1 mm. I-silicon carbide yensiza kagesi inezigaba ezimbili eziyinhloko. (1) I-silicon carbide eluhlaza esetshenziselwa izinto zokushisisa ugesi iyafana ne-silicon carbide eluhlaza esetshenziselwa ukugaya. (2) I-silicon carbide yesiboshwa inezidingo ezikhethekile zomsebenzi kagesi, ohlukile kune-silicon carbide emnyama yokugaya idatha ephikisayo.
Ukusetshenziswa kwe-atmospheric pressure sintered silicon carbide
Imikhiqizo ye-Atmospheric sintered silicon carbide inemisebenzi ekhethekile efana nokumelana nokushisa okuphezulu, ukumelana nokugqoka, ukumelana nokushisa, ukumelana nomlilo, ukumelana nemisebe, ukuguquguquka okuhle kakhulu kukagesi nokushisayo, njll., futhi isetshenziswe kabanzi eminyangweni ehlukahlukene yezomnotho kazwelonke. E-China, i-silicon carbide eluhlaza isetshenziswa ikakhulukazi njenge-abrasive. I-silicon carbide emnyama isetshenziselwa ukwenza amatshe okugaya, avame ukusetshenziselwa ukusika nokugaya izinto ezinamandla aphansi aqinile, njengengilazi, izitsha zobumba, amatshe, ama-refractories, kanye nokugaya izingxenye zensimbi ezisansimbi nezinto zensimbi ezingenayo ayoni. Ukugaya okwenziwe nge-silicon carbide eluhlaza kusetshenziselwa kakhulu ukugaya i-carbide enosimende, i-titanium alloy, ingilazi ebonakalayo, kanye nokugaywa kwe-cylinder liner namathuluzi ensimbi anesivinini esikhulu. Ama-abrasive e-Cubic silicon carbide asetshenziselwa kuphela ukugaya okunembe kakhulu kwama-bearings amancane. Ukumelana nokugqokwa kwama-turbine impellers kungathuthukiswa kakhulu ngokusebenzisa i-SIC powder kuwo nge-electroplating. Ngokusebenzisa ukucindezela komshini ukusunduza i-cubic SiC200 mill kanye ne-W28 micro-powder odongeni lwesilinda senjini evuthayo yangaphakathi, impilo yesilinda ingaba ngaphezu kokuphindwe kabili.
Isikhathi sokuthumela: Oct-11-2023