Tebea bɛn mu na alumina ceramics bɛma asɛe?
Alumina ceramic structure yɛ ade a wɔde di dwuma kɛse, wɔn a wɔde di dwuma no mu dodow no ara yɛ ne dwumadi a ɛkorɔn a ɛtoatoa so. Nanso, wɔ ɔkwan ankasa a wɔfa so de di dwuma no mu no, alumina ceramic structural parts no bɛyɛ nea wontumi nkwati, nneɛma a ɛde structure wear ba no dɔɔso, ebetumi asiw alumina ceramic structural parts no a ɛbɛwe no ano yiye afi saa afã horow yi mu.
Wɔte ase sɛ ade titiriw a ɛma alumina ceramic molds no hyɛ ne tumi a ɛwɔ akyi a ɛyɛ den no. Bere a wɔde aduru no redi dwuma no, sɛ wɔde hyɛ tumi a ɛbɔ anaa nhyɛso ase pɛ a, ɛbɛma alumina dɔte nhyehyɛe ahorow no asɛe anaasɛ abubu. Enti, ɛsɛ sɛ yɛbɔ mmɔden sɛ yɛbɛkwati sɛ yɛne nneɛma bɛbɔ bere a ɛreyɛ adwuma no na ama nneɛma a asɛe no so atew.
Nea ɛto so abien no, sɛ wɔde alumina ceramic nhyehyɛe no di dwuma bere tenten a, ɛbɛsan nso ama asɛe akodu baabi, nanso eyi yɛ adeyɛ a ɛyɛ daa, nea ehia ara ne sɛ wɔde besi ananmu bere a wɔayɛ no dodo akyi, a ɛkyerɛ sɛ alumina dɔte nhyehyɛe no som nkwa no atwam.
Bio nso, nneɛma a atwa yɛn ho ahyia no nyinaa nso bɛma alumina ceramic structural parts asɛe, ɛsɛ sɛ SO-a wɔfrɛ no nneɛma a atwa yɛn ho ahyia no nyinaa yɛ medium no nkɛntɛnso wɔ nneɛma a atwa yɛn ho ahyia no mu, nkɛntɛnso a mframa nya, ɔhyew nkɛntɛnso, ne nea ɛkeka ho, mpɛn pii esiane bere tenten-bere a mframa a ɛreworo so no ma structure parts no asɛe nti.
Bere koro no ara mu no, ebetumi aba esiane efĩ nkɛntɛnso a ɛwɔ nneɛma a atwa yɛn ho ahyia no so nti, ɛmfa ho nneɛma a ɛde alumina ceramic structural afã horow no asɛe no, ɛho hia sɛ wosiesie na wɔde si afã horow no ananmu wɔ bere mu, a ennya adwumayɛ a ɛfata no so nkɛntɛnso.
Alumina ceramics su ahorow .
Wɔakyekyɛ alumina ceramics mu ayɛ no ahotew a ɛkorɔn ne ɔkwan a ɛyɛ ɔkwan a wɔfa so yɛ no daa.
High ahotew alumina ceramic series Al2O3 content a ɛboro 99.9% wɔ ceramic ade no mu, esiane ne sintering hyew a ɛkɔ soro kodu 1650-1990℃, transmission wavelength a ɛyɛ 1 ~ 6μm, a mpɛn pii no wɔde ahwehwɛ a wɔayam ayɛ de asi platinum crucible ananmu; Fa ne hann a ɛde kɔ ne alkali metal corrosion resistance di dwuma sɛ sodium kanea tube; Wobetumi de adi dwuma sɛ integrated circuit board ne high frequency insulation material wɔ ɛlɛtrɔnik adwumayɛ mu.
Wɔakyekyɛ alumina ceramics a ɛyɛ mmerɛw mu ayɛ no 99 porcelain, 95 porcelain, 90 porcelain, 85 porcelain ne ahorow afoforo sɛnea Al2O3 a ɛwɔ mu no te, na ɛtɔ mmere bi a wɔde Al2O3 a ɛwɔ mu no nso to alumina ceramics series a ɛyɛ mpapahwekwa mu. Wɔn mu no, wɔde alumina porcelain nneɛma 99 na ɛyɛ fononoo mu afiri a ɛyɛ hyew kɛse, a ɛyɛ hyew a ɛyɛ hyew ne nneɛma titiriw a ɛsɛ sɛ ɛyɛ-nneɛma a ɛko tia, te sɛ ceramic bearings, ceramic seals ne nsu valves; 95 Wɔde alumina porcelain di dwuma titiriw sɛ corrosion resistance ne wear resistance afã horow; Wɔtaa de talc fra 85 porcelain no ma anyinam ahoɔden ne mfiri ahoɔden tu mpɔn, na wobetumi de molybdenum, niobium, tantalum ne dade afoforo akata so, na wɔde ebinom di dwuma sɛ anyinam ahoɔden mfiri.
1. Hardness a ɛkorɔn .
Shanghai Institute of Silicate of the Chinese Academy of Sciences susuw ne Rockwell a ɛyɛ den no yɛ HRA80-90, na den a ɛyɛ no yɛ nea ɛto so abien wɔ diamond akyi, ɛboro dade ne dade a ɛnyɛ den a ɛko tia ɔporɔw no so koraa.
2. Ɔhyɛ a ɛyɛ fɛ a ɛyɛ den sɛ ɛbɛhyɛ .
Nneɛma a ɛko tia ɔporɔw no yɛ manganese dade mmɔho 266 na ɛyɛ dade a wɔde chromium a ɛkorɔn ayɛ no mmɔho 171.5. Sɛnea yɛn adetɔfo akyi nhwehwɛmu a wɔayɛ no bɛboro mfe du kyerɛ no, wɔ adwumayɛ tebea koro no ara mu no, anyɛ yiye koraa no, wobetumi atrɛw nnwinnade no dwumadi nkwa mu mpɛn du.
3. emu duru a emu yɛ hare .
Ne density a ɛyɛ 3.5g/cm3 yɛ dade fã pɛ, a ebetumi atew nnwinnade adesoa so kɛse.
Mfiridwuma ho nsɛnkyerɛnne titiriw a ɛkyerɛ alumina ceramics .
alumina ceramic content a ɛboro anaasɛ ɛne no yɛ pɛ 92% .
density a ɛboro anaasɛ ɛne 3.6g /cm3 yɛ pɛ.
Rockwell hardness a ɛsõ sen anaasɛ ɛne 80 hra yɛ pɛ .
Ahoɔden a ɛwɔ nhyɛso mu a ɛboro anaasɛ ɛne 850 MPa yɛ pɛ .
Fracture toughness KιC a ɛboro anaasɛ ɛne 4.8MPa·m1/2 yɛ pɛ.
Ahoɔden a ɛkɔ fam a ɛboro anaasɛ ɛne 290MPa yɛ pɛ .
Ɔhyew a ɛma ɛyɛ hyew 20W/MK .
Ɔhyew mu ntrɛwmu nsusuwii: 7.2×10-6m/mk .
