Ọdịnaya carbon nke ọ bụla sintered ụdị mgbawa dị iche iche, na a carbon ọdịnaya nke A-2.5 awt.% na nke a nso, na-akpụ a ok ihe na ọ fọrọ nke nta ka ọ dịghị pores, nke mejupụtara uniformly ekesa silicon carbide particles na free silicon free. Site na mmụba nke mgbakwunye carbon, ọdịnaya nke silicon carbide mmeghachi omume na-abawanye nke nta nke nta, nha nke silicon carbide na-abawanye, na silicon carbide na-ejikọta ibe ya n'ụdị skeleton. Agbanyeghị, oke ikuku carbon nwere ike iduga n'ụzọ dị mfe n'ime carbon nke fọdụrụ n'ime ahụ nke emechiri emechi. Mgbe carbon ojii na-abawanyewanye na 3a, nkwụsị nke ihe nlele ahụ ezughị ezu, na "interlayers" ojii na-apụta n'ime.
Mgbe carbon na-emeghachi omume na silicon a wụrụ awụ, ọnụ ọgụgụ mgbasawanye olu ya bụ 234%, nke na-eme ka microstructure nke silicon carbide mmeghachi omume nwere njikọ chiri anya na ọdịnaya carbon dị na billet. Mgbe ọdịnaya carbon dị na billet dị obere, silicon carbide nke mmeghachi omume silicon-carbon na-emepụta ezughị iji mejupụta oghere dị n'akụkụ ntụ ntụ carbon, na-ebute nnukwu silicon n'efu na nlele. Site na mmụba nke ọdịnaya carbon na billet, silicon carbide mmeghachi omume nwere ike mejupụta pores gburugburu ntụ ntụ carbon wee jikọta silicon carbide mbụ ọnụ. N'oge a, ọdịnaya nke silicon n'efu na nlele ahụ na-ebelata na njupụta nke anụ ahụ na-abawanye. Agbanyeghị, mgbe enwerekwu carbon na billet, silicon carbide nke abụọ nke mmeghachi omume dị n'etiti carbon na silicon na-agba gburugburu toner ngwa ngwa, na-eme ka ọ na-esiri silicon a wụrụ awụ ike ịkpọtụrụ toner, na-ebute carbon fọdụrụnụ n'ime ahụ a kpụrụ akpụ.
Dị ka nsonaazụ XRD si kwuo, usoro nhazi nke mmeghachi omume-sintered sic bụ α-SiC, β-SiC na silicon efu.
N'ime usoro mmeghachi omume okpomọkụ dị elu, atom carbon na-akwaga na steeti mbụ na SiC elu β-SiC site na nhazi nke silicon α-secondary. Ebe ọ bụ na mmeghachi omume silicon-carbon bụ mmeghachi omume exothermic na-ahụkarị nke nwere nnukwu mmeghachi omume mmeghachi omume, ngwa ngwa jụrụ oyi mgbe obere oge nke mmeghachi omume okpomọkụ dị elu na-abawanye susaturation nke carbon gbazere na silicon mmiri mmiri, nke mere na akụkụ β-SiC na-ebuli ya na mmiri. ụdị carbon, si otú ahụ melite n'ibu Njirimara nke ihe. Ya mere, nchacha ọka β-SiC nke abụọ na-aba uru maka mmelite nke ike na-ehulata. N'ime usoro ihe mejupụtara Si-SiC, ọdịnaya nke silicon efu n'ime ihe na-ebelata na mmụba nke ọdịnaya carbon na akụrụngwa.
Mmechi:
(1) The viscosity nke njikere reactive sintering slurry na-abawanye na ọnụ ọgụgụ nke carbon ojii; Uru pH bụ alkaline ma jiri nwayọọ nwayọọ na-abawanye.
(2) Site na mmụba nke ọdịnaya carbon n'ime ahụ, njupụta na ike na-ehulata nke ceramics mmeghachi omume nke a kwadebere site na ịpị usoro buru ụzọ mụbaa wee belata. Mgbe ọnụ ọgụgụ nke carbon ojii bụ 2.5 ugboro nke mbụ ego, atọ-isi-ehulata ike na nnukwu njupụta nke green billet mgbe mmeghachi omume sintering dị nnọọ elu, nke bụ 227.5mpa na 3.093g/cm3, n'otu n'otu.
(3) Mgbe ahụ nke nwere oke carbon na-agbaze, mgbawa na mpaghara "sandwich" ojii ga-apụta n'ime ahụ nke ahụ. Ihe kpatara mgbawa ahụ bụ na silicon oxide gas nke a na-emepụta na usoro mmeghachi omume na-adịghị mfe, na-agbakọ nwayọọ nwayọọ, nrụgide na-ebili, na mmetụta jacking ya na-eduga na mgbawa nke billet. Na mpaghara "sanwichi" ojii n'ime sinter, enwere nnukwu carbon nke na-adịghị etinye aka na mmeghachi omume.
Oge nzipu: Jul-10-2023