Wanem wok bilong kamapim ol seramik i no inap bagarap?
1. Pauda redi
Aluminium oksait paura insait long fektori i stap insait long fektori i go insait long ol paura samting bihainim ol narapela narapela samting ol i mas mekim na ol narapela narapela wok bilong wokim ol samting bilong paura bilong paura i no winim 1μm maikron, sapos wok bilong wokim ol alumina seramik prodak bilong ol hai-puriti i stap antap long en, na tu, ol i mas givim ol hap bilong alumina long 99.99%, tasol ol i mas mekim ol hap bilong en i kamap gutpela long 999999999. yunifom. Taim ol i rausim o injeksen plet i no inap bagarap o injeksen, ol i mas putim bainder na plastisaisa i go insait long paura, jeneral thermoplastic o resin wantaim hevi resio bilong 10-30%, na oganik binder i mas miksim wankain wantaim alumina paura long {{7} digri digri long helpim wok bilong wokim mol.
The powder material formed by hot pressing process does not need to add binder. If semi-automatic or automatic dry pressing molding is used, the powder has special process requirements, and it is necessary to use spray granulation method to treat the powder and make it appear spherical, so as to improve the fluidity of the powder and facilitate the automatic filling of the mold wall in the molding. In addition, in order to reduce the friction between the powder and the mold wol, i nid blong ademap 1 kasem 2% blong lubriken, olsem stearik asid mo binder PVA. Blong draem pres molding, paoda sprei granulasen i nidim, we polivinil alkol i kam insaed olsem wan binder.
2. Moldim rot
The forming methods of alumina ceramic products include dry pressing, grouting, extrusion, cold isostatic pressing, injection, casting, hot pressing and hot isostatic pressing. In recent years, at home and abroad have developed a filter molding, direct solidification injection molding, gel injection molding, centrifugal injection molding and solid free molding technology. Ol narapela narapela prodak seip, sais, ol kompleks seip na ol stretpela prodak i nidim ol narapela narapela rot bilong molding. Introdaksen long komon foming bilong en:
◆ Grouting molding method: grouting molding is the earliest molding method used for alumina ceramics. Due to the use of gypsum mold, the cost is low and it is easy to form large size and complex shape parts. The key of grouting molding is the preparation of alumina slurry. Usually water is used as the flux medium, and then the degumming agent na binder i go insait, bihain long ful grinding, ges i go aut, na bihain plasta mol i kapsait i go bek bek. Bikos long kisim wara long ol kapilari bilong plasta mol, ol i solapi long mold. Taim wear-resistant plet i kapsait i kapsait plet i kapsait i kapsait i kapsait plet i kapsait i kapsait i kapsait plet i kapsait i kapsait i kapsait i kapsait i kam aut long wara i no inap bagarap. adsorbed long wol bilong mol i kamap long tiknes bilong ol i mas kisim . Bilong daunim mak bilong bodi i go daun, ol i mas yusim bikpela konsentresen slari inap long mak bilong i posibol.
◆ Dry press molding: alumina ceramic dry press molding technology is limited to simple shape and inner wall thickness of more than 1mm, length to diameter ratio is not greater than 4:1 objects. The molding methods are uniaxial or bidirectional. The press has two kinds of hydraulic type and mechanical type, which can be semi-automatic or automatic forming metod{{6} Maksimum presa bilong pres em 200Mpa{{8} Autput i ken kamap long 15 ~ 50 hap long wanpela minit. Bikos long yunifom strok presa bilong haidrolik pres, mak bilong ol hap bilong presim i narapela kain taim paura i pulap long paura i narapela kain long mak bilong paura i stap long mak bilong paura i stap long mak bilong paura i stap long en i save senis long mak bilong paura i stap long en, na dispela i mekim na ol i no isi long lidim i go long narapela narapela kain bilong en, na dispela i mekim na ol i no isi long lidim i go insait sintering na afektim kwaliti bilong prodak.
Olsem na, yunifom distribusen bilong ol paura patikel long drai presing proses em i bikpela samting tru long filling bilong mold. Sapos mak bilong pulapim i stret o nogat i gat bikpela influens long dimensenal ekyuresi kontrol bilong ol alumina seramik pat ol i wokim. Pauda patikel i gat moa long 60μm, namel long 60 ~ 200 mes i ken kisim gutpela presa bilong moldim, namel long 60 ~ 200 mes i ken kisim gutpela presa bilong mold.
Ol ogen aditiv tu i mas go insait tu long alumina seramik slari bilong kamapim wanpela dabol lektrik leit long pes bilong ol slari patikel bai ol i hangamapim slari i stap gut na i no gat setelmen{{0}' Antap long dispela, ol i putim ol samting olsem vinil alkohol, metil selulos, alginate amine na disperants olsem ol i save mekim ol samting i kamap gutpela long mekim ol samting bilong mekim ol samting i kamap long . Operesen bilong wokim ol samting bilong graun.
3. teknoloji bilong paia
Teknikel rot bilong mekim grenular seramik bodi na kamapim wanpela strongpela samting ol i kolim sintering. Rot bilong sintering em long rausim ol samting i stap nating namel long ol liklik hap insait long bodi bilong bilet, rausim liklik hap ges na ol samting nogut bilong oganik, na mekim ol liklik hap i kamap bikpela na bungim wantaim narapela long kamapim ol nupela samting{1}} .
The heating device used for firing is the most widely used electric furnace. In addition to atmospheric pressure sintering, that is, non-pressure sintering, there are hot pressure sintering and hot isostatic pressure sintering. Although continuous hot pressing sintering increases the output, the equipment and mold costs are too high, and the length of the product is limited due to axial heating. Hot isostatic presim sintering i yusim bikpela tempereja na hai presa ges olsem presa trensfer medium, i gat gutpela samting bilong yunifom hat long olgeta daireksen, na em i gutpela long sintering bilong ol kompleks seip prodak. Bikos long yunifom straksa, ol samting bilong dispela samting i 30 ~ 50% antap long jenerel hot prestering sintering . Em i 10 ~ 7}} Em i 10 ~ 7}} Em i 10 ~ 7}} Em i 10 ~ 7}} Em i 10 ~ 7}} Em i 10 ~ 7}} Em i 10 ~ 7}} Em i 10 ~ 7}}
Olsem na long nau, sampela hai veliu-eded alumina seramik prodak o spesel hap ol i nidim bilong nesenel difens, olsem ol seramik bearing, ol mira, nuklia fiul na gan barel na ol narapela prodak, fil i yusim hot isostatik pressing sintering rot.
Antap long dispela, i gat rot bilong mekim sin long maikrowev, rot bilong mekim wok long plasma, pasin bilong mekim sin bilong sintering i save spreim em yet i bin mekim wok bilong em yet i kamap.
4, pinisim na ol wok bilong putim
Sampela samting i mas pinis bihain long sintering. Ol samting ol i ken yusim olsem ol bun ol i wokim long han, olsem wanpela mira, bilong skruim gris bilong. Bikos long bikpela hat bilong ol alumina seramik samting, ol plet i no inap bagarap olsem SiC, B4C, ol i mas pinisim wantaim strongpela gris na polisim ol brik samting bilong brik.
Em i save kamap long ol samting i save kamap long rot i go inap long gutpela mak bilong grisim step bihain long step, laspela polising bilong polisim < 1μm maikron Al2O3 paura o daimon paste bilong grisim na polisim {4} Na tu, ol i ken yusim tu ol hap alumina na ol i mas mekim wok long ol alumina. paketim wantaim ol narapela samting.
