Setšoantšo sa ho utloisisa sebōpi sa vacuum hot pressing

1. Vacuum hot pressing sintering ke eng?

Ts'ebetso eo ho eona ho bopang le ho sintering ho phethoang ka nako e le 'ngoe ka ho sebelisa khatello ho phofo e hlephileng e behiloeng ka har'a hlobo e hlalositsoeng kapa ho futhumatsa motsoako oa phofo sebakeng sa vacuum.

2.Litšobotsi tsa vacuum hot sintering:

• Nakong ea ho hatelloa ho chesang, phofo e boemong ba thermoplastic, khanyetso ea deformation e nyenyane, 'me khatello e hlokahalang ea ho bōpa e nyenyane.

• Kaha ho futhumatsa le ho hatella ho etsoa ka nako e le 'ngoe, ho molemo bakeng sa ho kopana, ho hasana le ho phalla ha boima ba ho fetisa likaroloana tsa phofo, tse ka fokotsang mocheso oa sintering le ho khutsufatsa nako ea sintering, kahoo e thibela ho hōla ha lijo-thollo.

• Sintering e chesang e phethoa tlas'a maemo a vacuum, 'me' mele o entsoeng ka sintered o na le porosity e tlaase, e phahameng, le lijo-thollo tse ntle, 'me sehlahisoa se na le thepa e ntle ea mochine le motlakase.

3. Mokhoa oa ho hatella o chesang oa sintering:

Mothati oa 1: Khokahano ea Pore

Ho kenyeletsoa le methati ea pele le e bohareng ea sintering. Khatello e baka tlhahiso ea polasetiki sebakeng sa ho kopana le likaroloana; matla a exponential creep e etsahala sebakeng se atolositsoeng sa ho ikopanya, se bakang ho falla ha thepa; phallo ea molumo le ho aroloa ha moeli oa lijo-thollo ho etsahala pakeng tsa liathomo le likheo; dislocations hape etsa hore lijo-thollo moeli o thella ka ho hloa. Boima ba 'mele oa sintered bo eketseha ka potlako.

Mothati oa Bobeli: Ho Ikhetholla ho Hole

E boetse e tsejoa e le pheletso ea ho bina. Li-pores li teng meeling ea lijo-thollo, 'me li-micropores tsa intragranular ha li qheleloe ka thōko. Ka nako ena, mochine oa mohato oa pele o ntse o le teng, empa ho phalla le ho hasana ho fetoha mokhoa o ka sehloohong oa ho sintering, thepa e fokotseha butle-butle, 'me sehlahisoa se na le tekanyo e phahameng ea densification.

Mocheso o hatellang sintering densification process

• Nakong ea morao-rao ea sintering, khatello ea li-pores tse koetsoeng e ea eketseha, e fokotsang phello ea tsitsipano ea holim'a metsi, e fokolisa phello ea ho hasana ha meeli ea lijo-thollo, 'me e liehisa lebelo la phallo ea molumo, e leng se etsang hore ho be thata ho fokotseha qetellong. Ho tobetsa ho chesang ho fana ka matla a ka ntle ho lefella tsitsipano ea holim'a metsi, e lumellang sintering hore e tsoele pele.

• Tlas'a boemo ba ho hatella ho chesang, phofo e tiileng e ka 'na ea bontša thepa e seng ea Newtonian fluid. Ha khatello ea ho kuta e feta ntlha ea lihlahisoa tsa eona, e tla phalla, e leng se etsang hore ho be le keketseho ea sekhahla sa phetisetso ea bongata, 'me li-pores tse koetsoeng li ka felisoa ke phallo ea viscous kapa polasetiki ea thepa.

4.Tsebeliso ea ho tobetsa ho chesang ho sintering

(1)Indasteri ea phofo ea phofo: e sebelisoa haholo ho ntlafatsa ts'ebetso ea lihlahisoa tsa metallurgy. Lisebelisoa tse sebetsang li kenyelletsa lisebelisoa tse kopantsoeng tsa matrix tsa tšepe le lipheo tse fapaneng.

Papiso ea thepa ea li-composite tsa motlakase tse hatelitsoeng ka ho chesa le tse hatelitsoeng ka serame.

Khatello ea ho bopa e chesang e nyane, tekanyo ea densification ea sehlahisoa e phahame, 'me thepa ea thepa e phahametse haholo sintering e hatellang e batang.

Ha mocheso oa mocheso o chesang o le 750 ℃, nako ke 120min, 'me khatello ke 28MPa, boima ba thepa e lebisitsoeng bo fihla ho 95.3%.

Setšoantšo sa SEM sa karolo e fapaneng ea sepheo sa Ag-B

Ha mocheso o hatellang o chesang o le 1350 ~ 1380 ℃, khatello ke 25 ~ 30MPa, 'me nako ke 1.5 ~ 2h, sekhahla se lekanyelitsoeng sa thepa e reretsoeng ho feta 99%.

Setšoantšo sa SEM sa karolo e fapaneng ea sepheo sa alloy ea W-Si

(2)Indasteri ea Ceramic: bakeng sa ho lokisa thepa e thata ho e etsa. Tse kang silicon nitride ceramics, aluminium nitride ceramics le multi-composite ceramics.

Hot Press Sintering Laminated Composite Ceramic Materials

U sebelisa silicon nitride phofo e le thepa e tala, mocheso o chesang o hatelloang ke 1700 ~ 1800 ℃, 'me khatello e sebelisoang ke 20 ~ 30MPa.

Mocheso o chesang Sintering Silicon Nitride Ceramic Materials

5. Litlhoko tse tiileng tsa vacuum hot pressing process on the equipment

• Kamore ea ho futhumatsa e ka amohela likarolo tse chesang tse hatellang le hlobo.

• Tekanyo ea vacuum e ka fihlela litlhoko tsa ts'ebetso ea ho tobetsa e chesang.

• Thempereichara e ka laoloa ka nepo 'me ea fetoloa ka bo eona, 'me ho tšoana ho ntle.

• Ho nepahala ho phahameng ho laola khatello, setsi sa lihlooho tse ka holimo le tse tlaase tsa khatello.

• Thepa e entsoeng ka compression e hanyetsa mocheso o phahameng, e ka mamella khatello, 'me ha e sebetsane le' mele o sintered.

• Thepa e bolokehile ebile e ka tšeptjoa, 'me ts'ebetso e tsitsitse.

6. Vacuum sebōpi se chesang se chesang

(1) Litšobotsi tsa theknoloji tsa ACME Vacuum Hot Pressing Furnace

• Sebaka sa mocheso oa kamore ea ho futhumatsa se baloa ke boemo ba mocheso, 'me mocheso oa mocheso le mocheso oa mocheso oa mocheso o entsoe ka mokhoa oa modular, e le hore mocheso oa sebōpi o be o motle.

• E na le sensor ea khatello e tsoang kantle ho naha le sesebelisoa sa boima, taolo e nepahetseng ea khatello e phahameng e phahame.

• E na le sensor ea phalliso e tsoang kantle ho naha, taolo e nepahetseng ea taolo ea stroke e phahame.

• E tsamaisoa ke servo motor ho netefatsa botsitso ba ts'ebetso ea ho ts'oara khatello.

(2) Melemo ea ACME Vacuum Hot Pressing Furnace

• E khona ho hlokomela ts'ebetso e ikemetseng ea senotlolo se le seng, e bohlale ebile e sebetsa hantle.

• Vacuum/atmosphere hot ho khetha boikhethelo, ho pholile ho tloaelehileng/ka potlako, ho sebetsa ka thepa e matla.

• Sebopeho sa ho tiisa sa setsebi ho netefatsa tšebeliso ea nako e telele ea lisebelisoa ntle le ho lutla tlas'a vacuum, mocheso o phahameng le maemo a khatello e phahameng.

• Thepa ea indenter e hanyetsa mocheso o phahameng le khatello, 'me indenter e na le ho se jele paate hantle le ho bata.