Ka hopena o ka sintering i nā waiwai o ka zirconia ceramics

Ka hopena o ka sintering i nā waiwai o ka zirconia ceramics

E like me ke ʻano o ka mea seramika, he ikaika kiʻekiʻe ka zirconium, ka paʻakikī kiʻekiʻe, ke kūpaʻa maikaʻi ʻana i ka lole, ka waikawa a me ke kūpaʻa alkali, ke kūpaʻa wela kiʻekiʻe a me nā waiwai maikaʻi ʻē aʻe. Ma waho aʻe o ka hoʻohana nui ʻia i ka ʻoihana ʻoihana, me ka hoʻomohala ikaika ʻana o ka ʻoihana niho niho i nā makahiki i hala iho nei, ua lilo ka zirconia ceramics i mea ʻoi aku ka maikaʻi o ka niho niho a ua huki ʻia ka manaʻo o nā mea noiʻi he nui.

ʻO ka hana o ka zirconia ceramics e hoʻopili ʻia e nā kumu he nui, i kēia lā ke kamaʻilio nei mākou e pili ana i ka hopena o ka sintering i kekahi mau waiwai o ka zirconia ceramics.

ʻO ke ʻano hoʻoheheʻe

ʻO ke ʻano kuʻuna sintering ʻo ia ka wela i ke kino ma o ka hoʻoheheʻe ʻana i ka wela, ka conduction wela, ka convection wela, no laila ka wela mai ka ʻili o ka zirconia i loko, akā ʻoi aku ka maikaʻi o ka conductivity thermal o ka zirconia ma mua o ka alumina a me nā mea ceramic ʻē aʻe. I mea e pale aku ai i ka hakihaki ʻia e ke koʻikoʻi wela, ua lohi ka wikiwiki hoʻomehana kuʻuna a lōʻihi ka manawa, e hoʻolōʻihi i ka pōʻai hana o zirconia a kiʻekiʻe ke kumu kūʻai. I kēia mau makahiki i hala iho nei, ʻo ka hoʻomaikaʻi ʻana i ka ʻenehana hana o ka zirconia, ka pōkole o ka manawa hana, ka hōʻemi ʻana i ke kumukūʻai hana, a me ka hāʻawi ʻana i nā mea hana seramika zirconia dental i lilo i mea nui o ka noiʻi, a ʻo ka microwave sintering he mea kānalua ʻole ke ʻano hana sintering.

ʻIke ʻia ʻaʻohe ʻokoʻa koʻikoʻi o ka sintering microwave a me ke kaomi ʻana i ka lewa i ka mana o ka semi-permeability a me ke kūpaʻa ʻaʻahu. ʻO ke kumu, ʻo ka nui o ka zirconia i loaʻa e ka microwave sintering e like me ka sintering maʻamau, a ʻo nā mea ʻelua he sintering paʻa, akā ʻo nā pono o ka microwave sintering he haʻahaʻa sintering haʻahaʻa, wikiwiki wikiwiki a me ka manawa sintering pōkole. Eia naʻe, ua lohi ka piʻi ʻana o ka mahana o ke kaomi ʻana i ka lewa, ʻoi aku ka lōʻihi o ka manawa sintering, a ʻo ka manawa sintering holoʻokoʻa ma kahi o 6-11h. Ke hoʻohālikelike ʻia me ka sintering kaomi maʻamau, ʻo ka microwave sintering kahi ʻano sintering hou, nona nā pono o ka manawa sintering pōkole, kiʻekiʻe kiʻekiʻe a me ka mālama ʻana i ka ikehu, a hiki ke hoʻomaikaʻi i ka microstructure o nā ceramics.

Manaʻo kekahi poʻe ʻepekema ʻo ka zirconia ma hope o ka sintering microwave hiki ke mālama i ka pae tequartet metastable, malia paha no ka mea hiki i ka hoʻomehana wikiwiki ʻana o ka microwave ke hoʻokō i ka densification wikiwiki o ka mea ma kahi haʻahaʻa haʻahaʻa, ʻoi aku ka liʻiliʻi a ʻoi aku ka nui o ka palaoa ma mua o ka sintering maʻamau. ʻO ka nui o ka hoʻololi ʻana o ka māhele koʻikoʻi o t-ZrO2, kahi kūpono i ka mālama ʻana e like me ka hiki i ke kūlana metastable ma ka lumi wela, e hoʻomaikaʻi i ka ikaika a me ka paʻakikī o mea seramika.

Kaʻina hana hoʻopaʻa lua

Hiki ke hana wale ʻia nā seramics sintered zirconia me nā mea ʻoki emery ma muli o ka paʻakikī kiʻekiʻe a me ka ikaika, a he kiʻekiʻe ke kumukūʻai hoʻoili a lōʻihi ka manawa. I mea e hoʻoponopono ai i nā pilikia i luna, i kekahi manawa e hoʻohana ʻia nā ceramics zirconia i ʻelua kaʻina sintering, ma hope o ka hoʻokumu ʻia ʻana o ke kino seramika a me ka sintering mua, ka CAD / CAM amplification machining i ke ʻano i makemake ʻia, a laila sintering i ka wela sintering hope e hana. paʻa loa ka mea.

ʻIke ʻia e hoʻololi nā kaʻina hana sintering ʻelua i nā kinetics sintering o zirconia ceramics, a loaʻa kekahi mau hopena i ka sintering density, mechanical properties and microstructure of zirconia ceramics. ʻOi aku ka maikaʻi o nā waiwai mechanical o nā seramika zirconia machinable i hoʻopaʻa ʻia i hoʻokahi manawa ma mua o nā mea i hoʻopaʻa ʻia ʻelua. ʻOi aku ka kiʻekiʻe o ka biaxial bending ikaika a me ka haʻihaʻi o nā seramika zirconia machinable i hoʻopaʻa ʻia i hoʻokahi paʻa ma mua o nā mea i hoʻopaʻa ʻia ʻelua. ʻO ke ʻano haʻihaʻi o nā ceramics zirconia sintered mua he transgranular/intergranular, a pololei ka hahau ʻana. ʻO ke ʻano haʻihaʻi o ʻelua sintered zirconia ceramics ka hapa nui o ka intergranular fracture, a ʻoi aku ka tortuous o ka māwae. ʻOi aku ka maikaʻi o nā waiwai o ke ʻano haʻihaʻi hui ma mua o ke ʻano haʻihaʻi intergranular maʻalahi.

Sintering vacuum

Pono e hoʻopaʻa ʻia ʻo Zirconia i loko o kahi ʻona, ma ke kaʻina hana sintering e hoʻopuka i ka nui o nā ʻōpū, a i loko o kahi ʻāwīwī, maʻalahi ka hoʻokuʻu ʻana i nā ʻōpala mai ke ʻano hoʻoheheʻe o ke kino porcelain, e hoʻomaikaʻi i ka nui o ka zirconia, a laila hoʻonui i ka semi-permeability a me nā waiwai mechanical o zirconia.

Laki wela

I ke kaʻina hana sintering o zirconia, i mea e loaʻa ai ka hana maikaʻi a me nā hopena i manaʻo ʻia, pono e lawe ʻia kahi haʻahaʻa haʻahaʻa haʻahaʻa. ʻO ka nui o ka hoʻomehana kiʻekiʻe e hana i ka wela o loko o ka zirconia i ka wā e hiki ai i ka mahana sintering hope loa, e alakaʻi ana i ke ʻano o nā māwae a me ka hoʻokumu ʻana o nā pores. Hōʻike nā hopena me ka piʻi ʻana o ka wela wela, ua pōkole ka manawa crystallization o nā kristal zirconia, ʻaʻole hiki ke hoʻokuʻu ʻia ke kinoea ma waena o nā kristal, a piʻi iki ka porosity i loko o nā kristal zirconia. Me ka hoʻonui ʻana o ka hoʻomehana ʻana, hoʻomaka kahi liʻiliʻi o ka māhele kristal monoclinic e noho i ka pae tetragonal o zirconia, e hoʻopilikia i nā waiwai mechanical. I ka manawa like, me ka piʻi ʻana o ka wela wela, e polarized nā hua, ʻo ia hoʻi, maʻalahi ka hui pū ʻana o nā hua liʻiliʻi. ʻO ka wikiwiki o ka hoʻomehana ʻana he mea kūpono ia i ka hoʻokumu ʻana i nā ʻano hua like ʻole, e hoʻonui ai i ka semipermeability o zirconia.