Haʻahaʻa Cement Refractory Castable Product Introduction

Hoʻohālikelike ʻia nā mea hoʻoheheʻe sima haʻahaʻa me nā aluminate sima refractory castables. He 12-20% ka nui o ka hoʻohui ʻia ʻana o nā mea hoʻoheheʻe hoʻoheheʻe aluminate aluminate, a ʻo ka nui o ka hoʻohui wai he 9-13%. Ma muli o ka nui o ka wai i hoʻohui ʻia, he nui nā pores o ke kino i hoʻolei ʻia, ʻaʻole paʻa, a haʻahaʻa ka ikaika; ma muli o ka nui o ka ciment i hoʻohui ʻia, ʻoiai hiki ke loaʻa nā ikaika maʻamau a haʻahaʻa haʻahaʻa, e emi ana ka ikaika ma muli o ka hoʻololi crystalline o ka alumina calcium ma nā mahana wela. ʻIke loa, hoʻopuka ka CaO i hoʻokomo ʻia me SiO2 a me Al2O3 i loko o ka castable e hoʻohua i kekahi mau mea hoʻoheheʻe haʻahaʻa, e hopena i ka pōʻino o nā waiwai wela kiʻekiʻe o ka mea.

Ke hoʻohana ʻia ka ʻenehana pauka ultrafine, hoʻohui ʻia nā mea hoʻohui kiʻekiʻe a me ka gradation ʻepekema ʻepekema, ua hoʻemi ʻia ka ʻike cement o ka castable i lalo o 8% a ua hoʻemi ʻia ka ʻike wai i ≤7%, a hiki ke hoʻopaʻa ʻia ke kime haʻahaʻa. hoʻomākaukau a lawe ʻia i loko ʻO ka ʻike CaO he ≤2.5%, a ʻoi aku ka nui o kāna mau hōʻailona hana ma mua o nā mea hoʻoheheʻe aluminate cement refractory castables. ʻO kēia ʻano refractory castable he thixotropy maikaʻi, ʻo ia hoʻi, ʻo ka mea i hui pū ʻia i kekahi ʻano a hoʻomaka e kahe me ka ikaika o waho. Ke wehe ʻia ka ikaika o waho, mālama ia i ke ʻano i loaʻa. No laila, kapa ʻia ʻo ia he thixotropic refractory castable. Ua kapa ʻia ʻo thixotropic refractory castable. No kēia māhele. ʻAʻole i wehewehe ʻia ka manaʻo pololei o nā castable refractory haʻahaʻa haʻahaʻa. ʻO ka American Society for Testing and Materials (ASTM) wehewehe a hoʻokaʻawale i nā castable refractory e pili ana i kā lākou ʻike CaO.

ʻO ka mānoanoa a me ka ikaika kiʻekiʻe nā hiʻohiʻona koʻikoʻi o nā castables refractory haʻahaʻa-cement series. He mea maikaʻi kēia no ka hoʻomaikaʻi ʻana i ke ola lawelawe a me ka hana ʻana o ka huahana, akā lawe pū kekahi i nā pilikia i ka kuke ʻana ma mua o ka hoʻohana ʻana, ʻo ia hoʻi, hiki ke maʻalahi ka ninini inā ʻaʻole ʻoe e makaʻala i ka wā kuke. ʻO ke ʻano o ka pohā o ke kino ke koi hou ʻia i ka liʻiliʻi loa, a i ʻole e hoʻoweliweli i ka palekana pilikino o nā limahana a puni i nā hihia koʻikoʻi. No laila, ua hana nā ʻāina ʻē aʻe i nā haʻawina like ʻole e pili ana i ka kuke ʻana i nā castables refractory haʻahaʻa-cement series. ʻO nā hana ʻenehana nui: ma ka hoʻokumu ʻana i nā pihi umu kūpono a me ka hoʻokomo ʻana i nā mea hana anti-explosion maikaʻi loa, a me nā mea ʻē aʻe, hiki i kēia ke hana i ka refractory castables Hoʻopau ʻia ka wai me ka ʻole o nā hopena ʻē aʻe.

ʻO ka ʻenehana ʻenehana Ultrafine ka ʻenehana nui no nā castables refractory haʻahaʻa-cement series (i kēia manawa ka hapa nui o nā pauka ultrafine i hoʻohana ʻia i nā ceramics a me nā mea refractory maoli ma waena o 0.1 a me 10m, a hana nui lākou e like me ka dispersion accelerators a me ka densifiers structural. ʻO nā ʻāpana sima i hoʻopuehu nui ʻia me ka ʻole o ka flocculation, ʻoiai ka mea hope e hoʻopiha piha i nā micropores i loko o ke kino ninini a hoʻomaikaʻi i ka ikaika.

I kēia manawa, hoʻohana mau ʻia nā ʻano o nā pauka ultrafine i kēia manawa ʻo SiO2, α-Al2O3, Cr2O3, a me nā mea ʻē aʻe. ʻO ka ʻāpana kikoʻī o SiO2 micropowder ma kahi o 20m2 / g, a ʻo ka nui o kona ʻāpana he 1/100 o ka nui o ka nui o ka sima, no laila ua maikaʻi. hoʻopiha waiwai. Eia hou, hiki i ka SiO2, Al2O3, Cr2O3 micropowder, etc. Ke loaʻa kahi dispersant, hoʻokumu ʻia kahi papa pālua uila ma luna o ka ʻili o nā ʻāpana e hoʻohua i ka repulsion electrostatic, e lanakila ana i ka ikaika van der Waals ma waena o nā ʻāpana a hoʻemi i ka ikehu interface. Kāohi ia i ka adsorption a me ka flocculation ma waena o nā ʻāpana; i ka manawa like, ua hoʻopili ʻia ka dispersant a puni nā ʻāpana e hana i kahi papa solvent, kahi e hoʻonui ai i ka wai o ka castable. ʻO kēia kekahi o nā mīkini o ka pauka ultrafine, ʻo ia hoʻi, ka hoʻohui ʻana i ka pauka ultrafine a me nā dispersants kūpono hiki ke hōʻemi i ka hoʻohana ʻana i ka wai o nā castables refractory a hoʻomaikaʻi i ka wai.

ʻO ka hoʻonohonoho ʻana a me ka paʻakikī o nā castable refractory haʻahaʻa haʻahaʻa ka hopena o ka hana hui ʻana o ka hoʻopaʻa ʻana i ka hydration a me ka hoʻopaʻa ʻana i ka cohesion. ʻO ka hydration a me ka paʻakikī o ka calcium aluminate cement ka mea nui o ka hydration o ka hydraulic phases CA a me CA2 a me ke kaʻina o ka ulu ʻana o ke aniani o kā lākou hydrates, ʻo ia hoʻi, hana lākou me ka wai e hana ai i ka hexagonal flake a i ʻole ke ʻano o ka nila CAH10, C2AH8 a me nā huahana Hydration e like me. e like me ka cubic C3AH6 crystals a me Al2O3аq gels a laila e hana i ka condensation-crystallization network structure i ka wā o ka ho'ōla a me ka hoʻomehana ʻana. ʻO ka agglomeration a me ka hoʻopaʻa ʻana ma muli o ka ikaika SiO2 ultrafine pauka e hana ana i nā ʻāpana colloidal i ka wā e hui ai i ka wai, a hui pū me nā ion i hoʻokaʻawale ʻia mai ka mea hoʻohui i hoʻohui ʻia (ʻo ia hoʻi ka mea electrolyte). No ka mea, ua kū'ē nā koina ili o nā mea ʻelua, ʻo ia hoʻi, ua adsorbed ka ʻili colloid i nā ion counter, e hoʻemi ana i ka £2 Hiki ke hoʻemi ʻia a hiki i ka condensation ke hiki i ka adsorption i ka "isoelectric point". I nā huaʻōlelo ʻē aʻe, i ka emi ʻana o ka repulsion electrostatic ma ka ʻili o nā ʻāpana colloidal ma mua o kona huki ʻana, hiki ke hoʻopili ʻia me ke kōkua o ka ikaika van der Waals. Ma hope o ka hoʻopili ʻia ʻana o ka pahu refractory i hui pū ʻia me ka pauka silica, ua maloʻo nā pūʻulu Si-OH i hoʻokumu ʻia ma ka ʻili o SiO2 a maloʻo i ke alahaka, e hana ana i kahi ʻōnaehana siloxane (Si-O-Si), a laila paʻakikī. I loko o ka pūnaewele pūnaewele siloxane,ʻaʻole e emi iho nā paʻa ma waena o ke silikoni a me ka oxygen i ka piʻiʻana o ka mahana, no laila e hoʻomau ka ikaika. I ka manawa like, i nā wela kiʻekiʻe, e hoʻopili ka ʻōnaehana ʻo SiO2 me ka Al2O3 i kāwili ʻia i loko e hana i ka mullite, hiki ke hoʻomaikaʻi i ka ikaika ma waena a me nā wela kiʻekiʻe.