Sintering mfiridwuma a ɛwɔ alumina ceramics mu .
Wɔfrɛ mfiridwuma kwan a wɔfa so yɛ granular ceramic nipadua no den na ɛyɛ ade a ɛyɛ den no sintering. Ɔkwan a wɔfa so yɛ sintering ne sɛ wobeyi baabi a ɛda nneɛma nketenkete a ɛwɔ billet no nipadua mu no afi hɔ, ayi mframa ne efĩ a ɛwɔ nipadua no mu kakraa bi afi hɔ, na ama nneɛma nketenkete no anyin na wɔaka abom ayɛ nneɛma foforo.
Ɔhyew afiri a wɔde tow tuo no ne anyinam ahoɔden fononoo a wɔde di dwuma kɛse. Wɔ nhyɛso a ɛyɛ daa a wɔde sintering di akyi no, sintering a ɛyɛ hyew a wɔde mia ne isostatic a ɛyɛ hyew a wɔde mia so nso wɔ hɔ. Ɛwom sɛ sintering a ɛyɛ hyew a ɛkɔ so yɛ adwuma no ma nea efi mu ba no yɛ kɛse de, nanso nnwinnade ne nsunsu ho ka yɛ kɛse dodo, na bere tenten a wɔde yɛ no sua esiane axial heating nti. Hot isostatic pressing sintering de ɔhyew a ɛkɔ soro ne mframa a ɛyɛ nhyɛso kɛse di dwuma sɛ nhyɛso a ɛkɔ soro, ɛwɔ mfaso a ɛne ɔhyew a ɛyɛ pɛ wɔ akwan nyinaa so, na ɛfata ma sintering a ɛyɛ nneɛma a ɛyɛ den a wɔayɛ no sɛnea ɛte no. Esiane nhyehyɛe a ɛyɛ pɛ nti, nneɛma no su yɛ 30 ~ 50% a ɛkorɔn sen nea ɛwɔ awɔw a wɔde mia sintering. 10-15% no so sen general hot pressing sintering. Enti, ebinom bo a ɛkorɔn-added alumina ceramic products anaasɛ afã soronko a ehia ma ɔman ahobammɔ, te sɛ ceramic bearings, ahwehwɛ, nuklea petrol ne atuo nsuhina ne nneɛma afoforo, afuw no de hot isostatic pressing sintering kwan.
Bio nso, wɔreyɛ microwave sintering kwan, arc plasma sintering kwan ne self-propagating sintering technology nso.
Nneɛma a wɔde wie ne nea wɔde kyekyere nneɛma ho .
Ɛsɛ sɛ wowie alumina ceramic nneɛma bi bere a wɔayɛ no sintering awie no. Nneɛma a wobetumi de adi dwuma sɛ nnompe a wɔde nsa ayɛ no hwehwɛ sɛ wɔde nneɛma a ɛkorɔn wie te sɛ ahwehwɛ na ama srade ayɛ kɛse. Esiane sɛ alumina ceramic nneɛma no yɛ den kɛse nti, ɛho hia sɛ wɔde birikisi nneɛma a ɛyɛ den a wɔde twitwiw na wɔde yɛ no fɛfɛɛfɛ di dwuma de wie. te sɛ SIC, B4C anaa Diamond. Wɔtaa de di dwuma fi coarse kosi abrasive grinding step biara so, nea etwa to no ani polishing. Mpɛn pii no wobetumi de < 1μm micron Al203 powder anaa diamond paste adi dwuma de ayɛ grinding na wɔayɛ no fɛfɛɛfɛ. Bio nso, wobetumi de laser processing ne ultrasonic processing grinding ne polishing akwan nso adi dwuma.
alumina ceramic ahoɔden nhyehyɛe .
Sɛnea ɛbɛyɛ a wɔbɛhyɛ alumina dɔte mu den na wɔama wɔn mfiridwuma mu ahoɔden atu mpɔn kɛse no, wɔayɛ Alumina dɔte a ɛhyɛ den foforo wɔ amannɔne. Mfiridwuma no yɛ foforo na ɛnyɛ den, na mfiridwuma kwan a wɔfa so yɛ no ne sɛ wɔde silicon compound film a ɛwɔ alumina ceramics ani no bɛyɛ mprɛte denam electron ray vacuum coating so, sputtering vacuum coating anaa chemical vapor evaporation kwan so, ne ɔhyew ayaresa wɔ 1200℃~ 1580℃toughen the alummina ceramics.
Mfiridwuma ahoɔden a ɛwɔ alumina ceramics a wɔahyɛ no den no mu no, wobetumi anya nkɔanim kɛse wɔ mfitiase nnyinaso so, na wobetumi anya alumina ceramics a ɛwɔ ultra-ahoɔden a ɛkorɔn.
