Mmeghachi omume sintering
Mmeghachi omume na-akpụ akpụseramiiki silicon carbideUsoro mmepụta gụnyere imepụta seramiiki, imepụta ihe na-eme ka mmiri ghara ịbanye n'ime sintering, imepụta ihe na-eme ka mmiri ghara ịbanye n'ime sintering, nkwadebe ngwaahịa seramiiki, nkwadebe seramiiki osisi silicon carbide na usoro ndị ọzọ.
Ihe mkpuchi silicon carbide nke na-eme ka mmeghachi omume sintering
Nke mbụ, 80-90% nke ntụ seramiiki (nke e ji otu ma ọ bụ ntụ abụọ mee) meentụ ntụ silicon carbidena ntụ ntụ boron carbide), 3-15% nke ntụ ntụ isi iyi carbon (nke e ji otu ma ọ bụ abụọ nke resin carbon black na phenolic mee) na 5-15% nke ihe eji akpụ akpụ (phenolic resin, polyethylene glycol, hydroxymethyl cellulose ma ọ bụ paraffin) na-agwakọta ha nke ọma site na iji igwe igwe bọọlụ iji nweta ntụ ntụ agwakọtara, nke a na-afụ ma kpọọ nkụ, wee pịa ya na ebu iji nweta kọmpat seramiiki nwere ụdị dị iche iche.
Nke abụọ, a na-agwakọta ntụ silikọn 60-80%, ntụ silikọn carbide 3-10% na ntụ boron nitride 37-10% n'otu n'otu, ma pịa ya n'ime ebu iji nweta ihe na-eme ka sintering flux infiltration dị obere.
A na-ejikọta obere seramiiki na obere seramiiki na-abanye n'ime mmiri ọnụ, a na-ebulikwa okpomọkụ ahụ ruo 1450-1750℃ n'ime ọkụ ikuku nwere ogo ikuku nke na-erughị 5 × 10-1 Pa maka ịgbasa na ichekwa okpomọkụ ruo awa 1-3 iji nweta ngwaahịa seramiiki na-abanye n'ime mmiri mmeghachi omume. A na-ewepụ ihe fọdụrụ n'elu seramiiki ahụ site na ịpị iji nweta mpempe seramiiki dị oke arọ, a na-ejikwa ọdịdị mbụ nke obere seramiiki ahụ.
N'ikpeazụ, a na-eji usoro mwepụ mmeghachi omume eme ihe, ya bụ, silicon mmiri mmiri ma ọ bụ silicon alloy nwere ọrụ mmeghachi omume na okpomọkụ dị elu na-abanye n'ime oghere seramiiki oghere nwere carbon n'okpuru ọrụ nke ike capillary, ma na-emeghachi omume na carbon dị na ya iji mepụta silicon carbide, nke ga-agbasa na olu, a na-ejupụtakwa oghere ndị fọdụrụ na silicon elemental. Oghere seramiiki oghere nwere ike ịbụ carbon ma ọ bụ silicon carbide/ihe mejupụtara carbon. A na-enweta nke mbụ site na ịme katalytically na pyrolyzing resin organic, ihe mejupụtara oghere na ihe mgbaze. A na-enweta nke ikpeazụ site na pyrolyzing silicon carbide particles/ihe mejupụtara resin iji nweta ihe mejupụtara silicon carbide/carbon, ma ọ bụ site na iji α-SiC na ntụ ntụ carbon dị ka ihe mmalite na iji usoro ịpị ma ọ bụ ntụtụ ịkpụzi iji nweta ihe mejupụtara.
Ịgbasa ihe na-enweghị nrụgide
Enwere ike kewaa usoro sintering silicon carbide na-enweghị nrụgide n'ime sintering siri ike na sintering mmiri mmiri. N'afọ ndị na-adịbeghị anya, nnyocha emere naseramiiki silicon carbideN'ụlọ na mba ofesi, a na-elekwasị anya na ime ka mmiri sintering dị n'ime mmiri. Usoro nkwadebe seramiiki a bụ: igwekota ihe eji agwakọta bọọlụ -> ịgbasa granulation -> ịpị nkụ -> ịgbado ahụ akwụkwọ ndụ akwụkwọ ndụ -> ịgbado ọkụ.
Ngwaahịa silikọn carbide na-enweghị nrụgide
Tinye akụkụ 96-99 nke ntụ silicon carbide ultrafine (50-500nm), akụkụ 1-2 nke ntụ boron carbide ultrafine (50-500nm), akụkụ 0.2-1 nke nano-titanium boride (30-80nm), akụkụ 10-20 nke resin phenolic nke mmiri na-agbaze, na akụkụ 0.1-0.5 nke ihe na-agbasa nke ọma na igwe bọọlụ maka igwe na-egweri bọọlụ na ịgwakọta ya ruo awa 24, ma tinye slurry agwakọtara ahụ n'ime gbọmgbọm ngwakọta maka ịkpagharị ya ruo awa 2 iji wepụ afụ dị na slurry ahụ.
A na-efesa ngwakọta dị n'elu n'ime ụlọ elu granulation, a na-enwetakwa ntụ ntụ granulation nke nwere ọdịdị dị mma nke ihe ndị dị n'ime ya, ezigbo mmiri mmiri, oke nkesa ihe ndị dị n'ime ya na mmiri dị mma site na ijikwa nrụgide mmiri, okpomọkụ ikuku na-abanye, okpomọkụ ikuku na nha ihe ndị dị n'ime ya. Mgbanwe ugboro centrifugal bụ 26-32, okpomọkụ ikuku na-abanye bụ 250-280℃, okpomọkụ ikuku na-abanye bụ 100-120℃, nrụgide mmiri slurry bụ 40-60.
A na-etinye ntụ ntụ ntụ ntụ dị n'elu n'ime ihe e ji simenti mee ka ọ dị ka ihe na-acha akwụkwọ ndụ akwụkwọ ndụ. Usoro ịpị ya bụ nrụgide abụọ, na tọn nrụgide ngwaọrụ igwe bụ tọn 150-200.
A na-etinye ahụ akwụkwọ ndụ akwụkwọ ndụ a pịrị apị n'ime oven nkụ maka ịkpọ nkụ ma gwọọ ya iji nweta ahụ akwụkwọ ndụ akwụkwọ ndụ nwere ike dị mma maka ahụ akwụkwọ ndụ akwụkwọ ndụ.
A na-etinye ahụ akwụkwọ ndụ akwụkwọ ndụ a gwọrọ n'elu n'imeihe mkpuchi graphitema hazie ya nke ọma ma dịkwa mma, e mesịa, a na-etinye graphite crucible ya na ahụ akwụkwọ ndụ akwụkwọ ndụ n'ime ọkụ sintering vacuum dị elu maka ịgba ọkụ. Okpomọkụ ịgba ọkụ ahụ bụ 2200-2250℃, oge mkpuchi ahụ bụ awa 1-2. N'ikpeazụ, a na-enweta seramiiki sintered silicon carbide nke na-enweghị nrụgide dị elu.
Ịmepụta simenti siri ike
Enwere ike kewaa usoro sintering silicon carbide na-enweghị nrụgide n'ime sintering siri ike na sintering mmiri-usoro. Sintering mmiri-usoro chọrọ mgbakwunye nke ihe mgbakwunye sintering, dị ka ihe mgbakwunye Y2O3 binary na ternary, iji mee ka SiC na ihe ndị mejupụtara ya na-eweta sintering mmiri-usoro ma nweta njupụta na obere okpomọkụ. Usoro nkwadebe nke seramiiki sintering silicon carbide siri ike gụnyere ịgwakọta ihe ndị e ji emepụta ihe, granulation fesa, ịkpụzi, na sintering vacuum. Usoro mmepụta kpọmkwem bụ dị ka ndị a:
A na-etinye 70-90% nke submicron α silicon carbide (200-500nm), 0.1-5% nke boron carbide, 4-20% nke resin, na 5-20% nke organic binder n'ime igwekota ma tinye ya na mmiri dị ọcha maka ngwakọta mmiri. Mgbe awa 6-48 gachara, a na-agafe slurry agwakọtara site na sieve mesh 60-120;
A na-eji ihe mkpuchi a gwakọtara agwakọta fesaa slurry ahụ site na ụlọ elu a na-agbaze granulation. Okpomọkụ ntinye nke ụlọ elu a na-agbaze granulation bụ 180-260℃, okpomọkụ ọpụpụ bụ 60-120℃; njupụta nke ihe a gwakọtara agwakọta bụ 0.85-0.92g/cm3, mmiri mmiri bụ 8-11s/30g; a na-eji ihe a gwakọtara agwakọta sie ya site na sieve mesh 60-120 maka ojiji ma emechaa;
Họrọ ebu dịka ụdị ngwaahịa achọrọ si dị, tinye ihe ndị a gwakọtara agwakọta n'ime oghere ebu, ma mee ịkpụzi okpomọkụ ụlọ na nrụgide nke 50-200MPa iji nweta ahụ akwụkwọ ndụ akwụkwọ ndụ; ma ọ bụ tinye ahụ akwụkwọ ndụ akwụkwọ ndụ mgbe ịkpụzi mkpakọ ahụ n'ime ngwaọrụ ịpị isostatic, mee ịpị isostatic na nrụgide nke 200-300MPa, wee nweta ahụ akwụkwọ ndụ akwụkwọ ndụ mgbe ịpịchara nke abụọ;
Tinye ahụ akwụkwọ ndụ akwụkwọ ndụ e kwadebere n'usoro ndị dị n'elu n'ime ọkụ sintering vacuum maka sintering, nke ruru eru bụ seramiiki silicon carbide emechara; na usoro sintering dị n'elu, buru ụzọ wepụ ọkụ sintering ahụ, mgbe ọkwa vacuum ahụ ruru 3-5 × 10-2 Mgbe Pa gasịrị, a na-ebufe gas inert n'ime ọkụ sintering ahụ gaa na nrụgide nkịtị wee kpoo ya ọkụ. Mmekọrịta dị n'etiti okpomọkụ na oge ọkụ bụ: okpomọkụ ụlọ ruo 800℃, awa 5-8, nchekwa okpomọkụ maka awa 0.5-1, site na 800℃ ruo 2000-2300℃, awa 6-9, nchekwa okpomọkụ maka awa 1 ruo 2, wee jiri ọkụ mee ka ọ dị jụụ ma belata ya na okpomọkụ ụlọ.
Akụkụ obere na ókè ọka nke silicon carbide e simenti na nrụgide nkịtị
Na nkenke, seramiiki e ji usoro ịpị ọkụ mee nwere arụmọrụ ka mma, mana ọnụ ahịa mmepụta na-abawanye nke ukwuu; seramiiki e ji usoro ịpị ọkụ na-enweghị nrụgide kwadebe nwere ihe achọrọ dị elu, okpomọkụ ịpị ọkụ dị elu, mgbanwe nha ngwaahịa buru ibu, usoro mgbagwoju anya na arụmọrụ dị ala; ngwaahịa seramiiki e ji usoro ịpị ọkụ na-emepụta nwere njupụta dị elu, arụmọrụ dị mma megide ballistic, yana ọnụ ahịa nkwadebe dị ala. Usoro nkwadebe sintering dị iche iche nke seramiiki silicon carbide nwere uru na ọghọm nke ha, ọnọdụ ngwa ga-adịkwa iche. Ọ bụ amụma kacha mma ịhọrọ usoro nkwadebe ziri ezi dịka ngwaahịa ahụ si dị wee chọta nguzozi n'etiti ọnụ ahịa dị ala na arụmọrụ dị elu.
Oge ozi: Ọktoba-29-2024