Mmetụta mmeghachi omume
Mmetụta mmeghachi omumesilicon carbide seramiikiusoro mmepụta gụnyere seramiiki compacting, sintering flux infiltration agent compacting, mmeghachi omume sintering seramiiki nkwadebe, silicon carbide osisi seramiiki nkwadebe na ndị ọzọ nzọụkwụ.
Mmeghachi omume sintering silicon carbide nozzle
Nke mbụ, 80-90% nke seramiiki ntụ ntụ (nke mejupụtara otu ma ọ bụ abụọ powders nkesilicon carbide ntụ ntụna boron carbide ntụ ntụ), 3-15% nke carbon iyi ntụ ntụ (nke nwere otu ma ọ bụ abụọ nke carbon ojii na phenolic resin) na 5-15% nke onye na-akpụzi ihe (phenolic resin, polyethylene glycol, hydroxymethyl cellulose ma ọ bụ paraffin) na-agwakọta nke ọma. iji igwe igwe na-enweta ntụ ntụ agwakọta, nke a na-efesa akpọnwụwo na granulated, wee pịa ya na ebu iji nweta kọmpat seramiiki nwere nkọwa dị iche iche. ụdịdị.
Nke abuo, 60-80% silicon ntụ ntụ, 3-10% silicon carbide ntụ ntụ na 37-10% boron nitride ntụ ntụ na-agwakọta nke ọma, na pịa na a ebu iji nweta sintering flux infiltration agent compact.
The seramiiki kọmpat na sintered infiltrant kọmpat na-achịkọta ọnụ, na okpomọkụ na-ebuli ka 1450-1750 ℃ na a agụụ ọkụ na a agụụ ogo nke na-erughị 5 × 10-1 Pa maka sintering na okpomọkụ nchekwa maka 1-3 awa iji nweta mmeghachi omume sintered ngwaahịa seramiiki. A na-ewepụ ihe fọdụrụ na-abanye n'elu seramiiki sintered site na ịpị iji nweta mpempe akwụkwọ seramiiki siri ike, na-echekwa ọdịdị mbụ nke kọmpat.
N'ikpeazụ, a na-anabata usoro mmeghachi omume mmeghachi omume, ya bụ, silicon mmiri mmiri ma ọ bụ silicon alloy na mmeghachi omume mmeghachi omume na oke okpomọkụ na-abanye n'ime oghere seramiiki nke nwere carbon n'okpuru ọrụ nke ike capillary, ma na-emeghachi omume na carbon dị n'ime ya iji mepụta silicon carbide, nke. ga-agbasa na olu, na pores ndị fọdụrụ na-ejupụta na silicon elemental. Oghere seramiiki nke nwere oghere nwere ike ịbụ carbon dị ọcha ma ọ bụ silicon carbide/ihe mejupụtara carbon sitere na ya. A na-enweta nke mbụ site n'ịgwọ na pyrolyzing organic resin, pore bụbu na ihe mgbaze. A na-enweta nke ikpeazụ site na pyrolyzing silicon carbide particles / resin-based composite materials iji nweta silicon carbide / carbon-based composite material, ma ọ bụ site na iji α-SiC na carbon ntụ ntụ dị ka mmalite ihe na iji usoro ịkpụzi ma ọ bụ ịgbanye iji nweta ihe mejupụtara. ihe.
Sintering enweghị nrụgide
Enwere ike kewaa usoro nbibi na-enweghị nrụgide nke silicon carbide ka ọ bụrụ ihe siri ike na-agba ọsọ na usoro mmiri mmiri. Na-adịbeghị anya, nnyocha naceramics silicon carbideN'ụlọ na ná mba ọzọ etinyela uche na mmiri-phase sintering. Usoro nkwadebe seramiiki bụ: agwakọta ihe bọọlụ egwe ọka–>ịgba granulation–>akọrọ akọrọ–>green ahu solidification–> agụụ sintering.
Ngwaahịa silicon carbide na-enweghị nrụgide
Tinye akụkụ 96-99 nke silicon carbide ultrafine powder (50-500nm), 1-2 akụkụ nke boron carbide ultrafine ntụ ntụ (50-500nm), 0.2-1 akụkụ nke nano-titanium boride (30-80nm), 10-20 akụkụ. nke mmiri-soluble phenolic resin, na 0.1-0.5 akụkụ nke elu-arụmọrụ dispersant. na igwe ihe igwe maka igwe na-egwe ọka na ịgwakọta maka awa 24, ma tinye slurry agwakọta n'ime gbọmgbọm agwakọta maka ịmegharị awa 2 iji wepụ egosipụta na slurry.
The n'elu ngwakọta na-sprayed n'ime granulation ụlọ elu, na granulation ntụ ntụ na ezi urughuru morphology, ezi fluidity, warara urughuru nkesa nso na agafeghị oke mmiri mmiri na-enwetara site ịchịkwa ịgba mgbali, ikuku mbata okpomọkụ, ikuku tinyekwa okpomọkụ na ịgba akwụkwọ urughuru size. Ntugharị ugboro centrifugal bụ 26-32, ikuku ntinye ikuku bụ 250-280 ℃, ikuku ikuku ikuku bụ 100-120 ℃, na slurry mbata mgbali bụ 40-60.
A na-etinye ntụ ntụ granulation dị n'elu n'ụdị carbide cemented maka ịpị iji nweta ahụ ndụ ndụ. Usoro ịpị bụ nrụgide bidirectional, na igwe nrụgide tonnage bụ 150-200 tọn.
A na-etinye ahụ akwụkwọ ndụ akwụkwọ ndụ a na-agbanye n'ọkụ maka ihicha na ọgwụgwọ iji nweta ahụ ndụ ndụ nke nwere ezigbo ahụ ike akwụkwọ ndụ akwụkwọ ndụ.
A na-etinye ahụ akwụkwọ ndụ akwụkwọ ndụ a gwọrọ n'elu n'ime agraphite cruciblema hazie ya nke ọma na nke ọma, mgbe ahụ, a na-etinye graphite crucible na ahụ na-acha akwụkwọ ndụ akwụkwọ ndụ n'ime ọkụ na-ekpo ọkụ na-ekpo ọkụ maka ọkụ. Na-agbapụ okpomọkụ bụ 2200-2250 ℃, na mkpuchi oge bụ 1-2 awa. N'ikpeazụ, a na-enweta ceramics silicon carbide na-enweghị nrụgide na-arụ ọrụ dị elu.
Sintering siri ike
Enwere ike kewaa usoro nbibi na-enweghị nrụgide nke silicon carbide ka ọ bụrụ ihe siri ike na-agba ọsọ na usoro mmiri mmiri. Ngwunye mmiri mmiri na-achọ ka mgbakwunye nke ihe mgbakwunye nke sintering, dị ka Y2O3 binary na ternary additives, iji mee ka SiC na ihe ndị mejupụtara ya na-eweta mmiri mmiri-phase sintering ma nweta densification na obere okpomọkụ. Usoro nkwadebe nke seramiiki silicon carbide siri ike na-agbakọ na-agụnye ịgwakọta akụrụngwa, granulation spray, ịkpụzi, na vacuum sintering. Usoro mmepụta kpọmkwem bụ nke a:
70-90% nke submicron α silicon carbide (200-500nm), 0.1-5% nke boron carbide, 4-20% resin, na 5-20% nke ihe nkedo organic na-etinye na igwekota ma tinye ya na mmiri dị ọcha maka mmiri. ịgwakọta. Mgbe awa 6-48 gachara, a na-agafe slurry agwakọta site na sieve mesh 60-120;
A na-efesa slurry sieved site na ụlọ elu granulation na-agba. The mbata okpomọkụ nke ịgba granulation ụlọ elu bụ 180-260 ℃, na ntinye okpomọkụ bụ 60-120 ℃; nnukwu njupụta nke ihe granulated bụ 0.85-0.92g / cm3, fluidity bụ 8-11s / 30g; A na-ekpuchi ihe ndị ahụ granulated site na sieve 60-120 maka iji eme ihe;
Họrọ ihe ebu dị ka ụdị ngwaahịa achọrọ si dị, buru ihe granulated n'ime oghere ebu, wee mee mkpụkọ ọnụ ụlọ okpomọkụ na nrụgide nke 50-200MPa iji nweta ahụ ndụ ndụ; ma ọ bụ tinye ahụ ndụ ndụ mgbe mkpakọ ịkpụzi n'ime ihe isostatic ịpị ngwaọrụ, ịrụ isostatic ịpị na a mgbali nke 200-300MPa, na-enweta a green ahu mgbe secondary pressing;
Tinye akwụkwọ ndụ akwụkwọ ndụ a kwadebere n'ime usoro ndị a dị n'elu n'ime ọkụ na-ekpo ọkụ maka ịmegharị ihe, na onye tozuru etozu bụ seramiiki silicon carbide bulletproof; N'ime usoro ihe nkedo dị n'elu, buru ụzọ wepụ ọkụ ọkụ na-ekpo ọkụ, na mgbe ogo okpomọkụ ruru 3-5 × 10-2 Mgbe Pa, a na-agafe gas inert n'ime ọkụ ọkụ na-agbanye ọkụ na nrụgide nkịtị wee kpoo ọkụ. The mmekọrịta dị n'etiti kpo oku okpomọkụ na oge bụ: ụlọ okpomọkụ ruo 800 ℃, 5-8 awa, okpomọkụ nchekwa maka 0.5-1 hour, si 800 ℃ ka 2000-2300 ℃, 6-9 awa, okpomọkụ ichebe 1 ka 2 awa, wee mee ka ọkụ dị jụụ wee daa n'ime ụlọ okpomọkụ.
Microstructure na oke ọka nke silicon carbide gbajiri na nrụgide nkịtị
Na nkenke, ceramics arụpụtara site na-ekpo ọkụ ịpị usoro sintering na-arụ ọrụ ka mma, ma mmepụta ihe na-abawanye nke ukwuu; ceramics nke a kwadebere site na nkwụsịtụ na-enweghị nrụgide nwere ihe ndị dị elu chọrọ akụrụngwa, okpomọkụ dị elu, mgbanwe nha ngwaahịa buru ibu, usoro mgbagwoju anya na arụmọrụ dị ala; ngwaahịa seramiiki mepụtara site na mmeghachi omume sintering usoro nwere nnukwu njupụta, ezigbo mgbochi ballistic arụmọrụ, na dịtụ ala nkwadebe ọnụ ahịa. Usoro nkwadebe dị iche iche nke silicon carbide ceramics nwere uru na ọghọm nke ha, na ọnọdụ ngwa ga-adịkwa iche. Ọ bụ amụma kachasị mma ịhọrọ usoro nkwadebe ziri ezi dịka ngwaahịa ahụ si dị ma chọta nguzozi n'etiti ọnụ ala dị ala na arụmọrụ dị elu.
Oge nzipu: Ọkt-29-2024