Zirconia vs Silicon Nitride Ceramic mphete: Kusiyana Kwakukulu, Katundu, ndi Ntchito

Chiyambi Chachikulu cha Zirconia ndi Silicon Nitride Ceramic Rings

Kusiyana pakati pa mphete za zirconia ndi silicon nitride ceramic kumachokera ku njira yolumikizirana ndi zinthu ndi kapangidwe kake: yoyamba imapeza "kuuma ndi kusinthasintha" kudzera mu kulimbitsa kusintha kwa gawo ndipo ndi yoyenera pazochitika zapakati, zosinthirana; yachiwiriyo imadalira mphamvu ya covalent bonding ndi kapangidwe ka columnar crystalline ndipo imachita bwino kwambiri m'malo otentha kwambiri, olemera kwambiri, komanso owononga kwambiri.

Ndi chitukuko cha luso nanocomposite ndi ndondomeko zina kupanga, awiri ntchito malire pang'onopang'ono kukula - zirconia kudzera nanoparticle kupezeka kulimbitsa kumapangitsanso kuuma ndi pakachitsulo nitride mwa CHIKWANGWANI toughening kusintha kulimba; tsogolo likuyembekezeredwa kuti likwaniritse zida zambiri zapamwamba pamtundu wa njira zina komanso zowonjezera.

Kusiyanasiyana kwa kapangidwe kazinthu ndi kapangidwe kazinthu

Zirconia ceramic mphete yokhala ndi zirconium dioxide (ZrO₂) monga gawo lalikulu, kapangidwe kake ka kristalo ndi kutentha komwe kumawonetsa gawo la monoclinic, gawo la tetragonal, kusintha kwa kiyubiki. Gawo la monoclinic, lomwe limakhala lokhazikika pa kutentha kwa chipinda, likhoza kupanga njira yolimba ya tetragonal poyambitsa zolimbitsa thupi monga yttrium oxide (Y₂O₃), yomwe imapangitsa kuti ikhale yolimba pogwiritsa ntchito njira ya "phase change toughening". Mu microstructure yake, stabilizers amagawidwa mofanana pamalire a tirigu, kulepheretsa kuwonjezeka kwa voliyumu kuphulika kwa gawo la tetragonal → gawo la monoclinic panthawi yozizira, zomwe zimapangitsa kuti zinthuzo zikhale zamphamvu komanso zosagwirizana.

Mphete za silicon nitride ceramic zimapangidwa ndi silicon nitride (Si₃N₄), yomwe imakhala yogwirizana kwambiri ndi α-phase (makristasi otsika otsika kutentha acicular) ndi β-phase (makhiristo afupipafupi otentha kwambiri). Gawo la α limasinthidwa pang'onopang'ono kukhala β-gawo panthawi yotentha kwambiri, ndipo zomwe zili mu β-gawo zimatsimikizira mwachindunji mphamvu ya zinthuzo. Chifukwa cha mgwirizano wamphamvu, ndikofunikira kuwonjezera zowonjezera zowonjezera monga MgO ndi Al₂O₃ kuti muchepetse mphamvu yoyambitsa sintering ndikulimbikitsa kachulukidwe. Kapangidwe kakang'ono kamene kamayang'aniridwa ndi makonzedwe apakati a β-phase columnar crystals, kupanga "kuwonjezera masharubu", zomwe zimapangitsa kuti zinthuzo zikhale zolimba kwambiri komanso kukana kuvala.

Kuyerekeza kwa physicochemical properties

mawotchi katundu

Zirconia: kulimba kwapang'onopang'ono (5 ~ 15 MPa ・ m¹/²), mphamvu yopindika 800 ~ 1200 MPa, yoyenera kunyamula katundu, koma kulimba kwapang'onopang'ono (Vickers kuuma 1200 ~ 1500 HV), kukana kuvala ndikotsika pang'ono ku silicon nitride.

Silicon nitride: mphamvu yopindika mpaka 1000 ~ 1500 MPa, Vickers kuuma 1800 ~ 2200 HV, kukana kuvala ndi 1/5 ~ 1/3 ya alumina ceramics, koma kulimba kwa fracture ndi 3 ~ 6 MPa ・ m¹/², kukana ndikofooka, kumachokera ku zinthu zomwe zimawonongeka.

Mphamvu zamafuta

Zirconia: kutsika kwamafuta otsika (2 ~ 3 W / (m ・ K)), kusungunula kwabwino kwamafuta, coefficient of thermal expansion (9 ~ 10 × 10-⁶ / ° C) ili pafupi ndi chitsulo, choyenera kufananiza ndi zitsulo; Komabe, bata matenthedwe pa kutentha ndi osauka, ntchito yaitali kutentha pafupifupi 1100 ℃.

Silicon nitride: matenthedwe matenthedwe okwera mpaka 20 ~ 30 W/(m ・ K), kuthekera kwapadera kwa kutentha kwamphamvu, kutsika kocheperako kowonjezera kwamafuta (2.5 ~ 3.2 × 10-⁶/°C), kukhazikika kowoneka bwino, kungagwiritsidwe ntchito kwanthawi yayitali m'malo otentha kwambiri, kukana kutentha kwa 1300 ° C, 800 kukana kupitirira XNUMX ° C. (△T=XNUMX°C popanda kuphulika) ndi yabwino kwambiri kuposa zirconia.

Chemical katundu

Zirconia: asidi wabwino ndi kukana zamchere, akhoza kukana zambiri inorganic zidulo (kupatula asidi hydrofluoric) ndi amphamvu zamchere dzimbiri, kutentha kwambiri pa zotayidwa, mkuwa ndi zina kusungunuka kukokoloka zitsulo kukana, chimagwiritsidwa ntchito zitsulo crucibles.

Silicon nitride: zambiri mankhwala inert, kuwonjezera asidi hydrofluoric ndi otentha amphamvu alkali, pafupifupi palibe anachita ndi sing'anga mankhwala, makamaka kugonjetsedwa ndi chitsulo, chitsulo, nthaka kukokoloka kwa zitsulo, ndiye kusankha koyamba kwa mkulu-kutentha zosagwira dzimbiri m'munda zakuthambo.

Kusiyana kwa kukonzekera

Zirconia ceramic mphete amapangidwa ndi ufa zitsulo ndondomeko: mkulu chiyero ZrO₂ ufa (tinthu kukula <1 μm) youma mbamuikha / isostatic mbamuikha ndi kuumbidwa, ndiye sintered pa 1500 ~ 1700 ℃ mu mpweya mlengalenga, ndi toughened ndi gawo tetragonal → monoclinic gawo kusintha anachititsa ndi kuziziritsa mlingo kulamulira. Chinsinsi cha ndondomekoyi chagona mu yunifolomu kubalalitsidwa kwa stabilizers ndi kulamulira gawo kusintha, ndi pambuyo mankhwala utenga akupera ndi kupukuta kusintha kulondola pamwamba.

Mphete za silicon nitride ceramic zimafuna luso lapadera la sintering: Reaction sintering: Silicon powder imakhudzidwa mwachindunji ndi nayitrogeni kuti ipange Si₃N₄, yomwe ili yotsika mtengo koma ilibe kachulukidwe (<90%) ndipo imakhala ndi ntchito yochepa;

Hot atolankhani sintering: pansi 1600 ~ 1800 ℃, 20 ~ 30 MPa nayitrogeni kuthamanga, mothandizidwa ndi sintering zina kulimbikitsa kachulukidwe, kachulukidwe> 95%, koma dzuwa kupanga ndi otsika;

Pneumatic sintering njira: sintered mu 1 ~ 2 MPa nayitrogeni pa kuthamanga kwambiri, akhoza kupeza zinthu pafupi ndi kachulukidwe chiphunzitso, zonse ntchito mkulu ndi mphamvu yaikulu kupanga. Njira yowumba nthawi zambiri imatenga jekeseni kapena jekeseni wa gel kuti azindikire kukonzekera kwazinthu zovuta.

Kusiyanasiyana kwa zochitika zogwiritsira ntchito

Chitsanzo ntchito zirconia ceramic mphete

Zisindikizo zamakina ndi mayendedwe: kugwiritsa ntchito mwayi wakulimba kwambiri, komwe kumagwiritsidwa ntchito ngati mphete zosindikizira pamapampu amadzi ndi ma compressor kuti asakane kugwedezeka kwamadzi ndi kugwedezeka;

Kupaka pamagetsi: coefficient of thermal expansion yofananira ndi tchipisi za silicon, zomwe zimagwiritsidwa ntchito ngati magawo ophatikizika ozungulira kapena zipolopolo za ceramic;

Implants zachipatala: biocompatibility yabwino kwambiri, yogwiritsidwa ntchito m'malo olumikizirana m'chiuno ndi m'mano opangira mano, osathyoka mosavuta akalemedwa mosinthana.

Zochitika zazikulu za mphete za silicon nitride ceramic

Injini yazamlengalenga: masamba opangira turbine, mayendedwe ndi zida zina zotentha kwambiri, zosagwirizana ndi dzimbiri la gasi komanso kutulutsa kothamanga kwambiri kwa mpweya pamwamba pa 1300 ℃;

Kupanga ma semiconductor: ma etching machine cavities, mapaipi oyendera gasi, kukana kukokoloka kwamphamvu kwa plasma;

Zida zopangira mwatsatanetsatane: zida zodulira mwachangu (monga odulira mphero ndi kubowola), kugwiritsa ntchito kuuma kwakukulu kuti mukwaniritse kukonza bwino kwa simenti ya carbide;

Malo atsopano amphamvu: mphete yothandizira ma cell cell, matenthedwe amafuta komanso kukhazikika kwamankhwala, kuwonetsetsa kuti batire ikugwira ntchito kwanthawi yayitali.

Wogulitsa

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Tags: Zirconia, Silicon Nitride, Ceramic mphete