Alumina hpe n-gun n rawng ai ceramic ni hpe galaw shapraw ai lam gaw hpa rai ta?
1. Powder hkyen lajang ai lam
Dai jak rung kata na aluminum oxide powder hpe n bung ai arung arai ni hte n bung ai hkrang shapraw ai lam ni hte maren powder arung arai ni hku nna lajang da ai. 1μm micron hta n-ga, 99.99% hta alumina a san seng ai hta n-ga, n-gun ja ai alumina ceramic arung arai ni hpe galaw shapraw ai gaw, 1μm micron hta n-pu na n-gun n law ai, raitim, n-gun n-gun hpe ultrafine galaw nna, shi a particle size garan ginhka ai uniform hpe mung galaw ra ai. Dai n-gun hpe n-gun n-ja ai n-gun hpe shapraw kau ai (sh) tsi htu ai shaloi, binder hte plasticizer hpe powder kata de bang ra ai, general hku nna thermoplastic (sh) resin hpe 10-30% n-gun n-gun hte n-gun n-gun hte n-gun dat hpe 150-200℃hta alumna powder hte maren sha kayau kaya galaw ra ai.
Hot pressing process hku nna byin pru wa ai powder material hpe binder bang na n ra ai. Semi-automatic (sh) automatic dry pressing molding hpe lang ai rai yang, powder hta laksan ladat ra ai, hka htung hpe tsi lajang na matu hte hka htung zawn rai hkra spray granulation ladat hpe jai lang ra ai, dai hku nna powder a ntsin hpe grau kaja hkra galaw ya lu na matu hte molding kata na mold wall hpe automatic filling galaw ya lu na matu ra ai. Dai hta n-ga, powder hte mold wall lapran na shingjawng ai lam hpe shayawm na matu, steearic acid hte binder PVA zawn re ai sau hta na 1 kaw nna 2% du hkra jat ra ai. press molding hpe hkyet na matu, powder spray gralation ra ai, dai hta polyvinyl alcohol hpe binder hku nna bang ai.
2. Molding ladat
Alumina ceramic arung arai ni a hkrang shapraw ai ladat ni gaw, hka lim ai, n-gun ja ai, n-gun n rawng ai, katsi ai isostatic n-gun, tsi htu ai, casting, n-gun ja ai hte n-gun ja ai isostostatic pressing ni lawm ai. Kade nna ai aten hta, buga hte maigan mungdan ni hta filter molding, direct solidification injection, gel injection molding, centrifugal injection hte solid free molding hpaji masa ni hpe gyin shalat wa sai. Hpa majaw nga yang, n bung ai arung arai hkrang, galu kaba ai, n bung ai hkrang hte hkrak ai arung arai ni gaw, n bung ai molding ladat ni ra ai. Shi a bung ai hkrang hpe hpaw shadan dan ai lam:
◆ Griuting molding ladat: n-gun rawng ai molding ngu ai gaw alumina ceramic ni a matu lang ai shawng nnan na molding ladat re. Gypsum mold hpe lang ai majaw, manu n law ai hte, kaba ai hte n bung ai hkrang daw ni hpe galaw na matu loi ai. Griuting molding a madung gaw alumina slurry hpe hkyen lajang ai lam rai nga ai. Kalang lang hka hpe flux medium hku lang nna, dai hpang deguming agent hte binder hpe jat bang nna, hkum tsup ai hku htu ngut ai hpang, gas hpe shapraw kau nna, plaster mold hpe hpang de ru kau ya ai. Hka hpe hkap la ai majaw, plaster mold a capillaries ni a majaw, slurry gaw mold hta ngang kang wa ai. Dai n-gun n rawng ai plate gaw hollow grouting byin wa ai shaloi, n-gun grau law ai slurry hpe n-gun n rawng ai bunghku ntsa e shinggrup da ai slurry gaw ra ai n-gun de du wa ai shaloi ru kau ra ai. Hkum hkrang hpe shayawm kau na matu, n-gun ja ai slurry hpe mai byin ai daram lang ra ai.
◆ Dry press molding: alumina ceramic dry press molding hpaji gaw asan sha re ai hkrang hte 1mm jan a kata na bunghku galu ai, galu kaba ai hte diameter ratio gaw 4:1 hta n law ai. Molding ladat ni gaw uniaxial (sh) bidirectional re. Dai press hta hydraulic amyu lahkawng nga ai hte jak amyu lahkawng nga ai, dai gaw semi-automatic (sh) shi hkum shi galaw ai ladat rai mai ai. Dai press a n-gun grau law ai gaw 200Mpa re. Dai pru ai lam gaw minit mi hta 15 ~ 50 daram du lu ai. Hydraulic n-gun n bung ai majaw, powder filling n bung ai shaloi, n-gun rawng ai daw ni a tsaw ai gaw n bung ai. Mechanical press hku nna lang ai n-gun a kaba ai lam gaw, powder hpe jahpring ai n-gun a majaw n bung ai, dai gaw sintering ngut ai hpang shrinkage n bung ai lam hpe byin shangun nna, dai product a quality hpe hkra machyi shangun ai.
Dai majaw, dry pressing galaw ai hta powder particles ni a langai sha re ai garan ginhka ai lam gaw, n-gup n-gu hpe jahpring na matu grai ahkyak nga ai. Dai hpring ai gumhpraw gaw hkrak ai kun n hkrak ai kun ngu ai gaw, galaw shapraw da ai alumina ceramic daw ni hpe dimensional hkrak ai hku hkang lu ai atsam hpe grai shadut ya ai. 60μm jan nga ai Powder particles ni, 60 ~ 200 mesh lapran hta kaja dik htum pressure molding effect hpe lu la na matu, n-gun grau law ai free flow effect hpe lu la mai ai.
Organic additives ni hpe mung alumina ceramic slurry hta bang nna, slurry particles ni a ntsa e wan n-gun lahkawng hpe galaw ra ai majaw, slurry hpe n-gun n rawng ai sha, n-gun n rawng ai sha, n-gun rawng ai hku n-gun n rawng hkra tawn da ra ai. Dai hta n-ga, vinyl alcohol, methyl cellulose, alginate amine hte polyacrylamide hte gum Arabic zawn re ai garan ginhka ai ni zawn re ai binder ni hpe jat bang nna, n-gun ja ai n-gun hpe gram lajang na matu htuk manu hkra galaw ya ai.
3. Firing hpaji masa
Granular ceramic hkum hkrang hpe densify galaw nna ngang kang ai arung arai langai hpe hpaw shabawn ai hpaji ladat hpe sintering ngu shamying ma ai. Sintering galaw ai ladat gaw, billet a hkum hkrang kata na particles ni a lapran na n-gun hpe yeng seng kau nna, gas loi mi hte n-gun n rawng ai organic matter ni hpe shaw kau nna, particle ni hpe rawt jat wa hkra galaw nna, langai hte langai hpawng de nna, langai hte langai hpawng de nna, n-gun nnan ni hpe hpaw shabawn na matu re.
Hka lum ai jak gaw grau nna lang ai wan wut ai wan wut ai jak re. Nbung n-gun hpe sintering galaw ai hta n-ga, n-gun n-gun n-gun n-gun n-gun n-gun n-gun n-gun n-gun n-gun n-gun n-rawng ai hte n-gun ja ai n-gun hpe sintering galaw ai lam ni nga ai. Matut manoi hot pressing sintering gaw pru wa ai lam hpe jat ya ai raitim, jak hte n-gup magap manu ni grai law ai, axial katsi ai majaw, dai arung arai a galu kaba ai lam gaw shadawn sharam sha rai nga ai. Hot isstatic pressing sintering gaw nbung n-gun kaba ai hte n-gun kaba ai gas hpe n-gun htawt sit ai ladat hku lang ai, maga shagu hta uniform katsi ai hpe lu ai, n-gun ja ai hkrang shapraw ai arung arai ni hpe sintering galaw na matu htuk manu ai. Dai majaw, n-gun rawng ai n-gun gaw, n-gun rawng ai n-gun gaw, n-gun n-gun n-gun n-gun n-gun n-gun n-gun n-gun n-gun n-gun n-gun n-gun n-gun n-gun n-gun n-gun n-gun n-gun n-gun n-gun n-nga ai. Dai gaw, n-gun n rawng ai sintering hta 10 ~ 15% grau law ai.
Dai majaw, ya aten hta, manu dan ai alumina ceramic arung arai ni (sh) mungdan a makawp maga lam a matu ra ai laksan daw nkau mi, ceramic bearings, mirror, nuclear wan sau hte sinat laknak ni hte kaga arung arai ni zawn re ai ni hpe, hkai sun gaw, n-gun ja ai isostostatic pressing pressing pressing ladat hpe jai lang ai.
Dai hta n-ga, microwave sintering ladat, arc plasma sintering ladat, tinang hkum hpe sintering galaw ai ladat ni nga ai.
4, ngut kre ai hte shinggyin la ai lam ni
Sintering galaw ngut ai hpang, arung arai nkau mi hpe galaw ngut ra ai. Artificial bone hku nna lang mai ai arung arai ni gaw, sau hpe jat wa na matu, shingran zawn re ai, ntsa lam n-gun kaba ra ai. Alumina ceramic arung arai ni a n-gun grai ja ai majaw, n-gun n rawng ai plate ni hpe grau yak ai grinding hte polishing lung seng arung arai ni hte galaw ngut ra ai. SiC, B4C (sh) lung seng zawn re ai.
Dai hpe n-gun n rawng ai kaw nna, n-gun ja ai n-gun rawng ai lahkam langai hpang langai, hpang jahtum na ntsa na ntsa lam hpe n-gun jaw ai lam ni du hkra lang ma ai. Madung hku nna gaw < 1μm micron Al2O3 powder (sh) diamond paste galaw na matu lang mai ai. Dai hta n-ga, laser galaw ai lam hte ultrasonic galaw ai lam ni hpe mung lang mai ai. Alumina ceramic daw nkau mi hpe kaga arung arai ni hte shinggyin tawn da ra ai.
