Ka whakaritea ngā mea whakarewa sima iti-aukati ki ngā mea whakarewa sima aluminate tuku iho. Ko te nui o te sima i tāpirihia ki ngā mea whakarewa sima aluminate tuku iho he 12-20% te nuinga, ā, ko te nui o te wai i tāpirihia he 9-13%. Nā te nui o te wai i tāpirihia, he maha ngā pūwero o te tinana whakarewa, kāore i te matotoru, ā, he iti te kaha; nā te nui o te sima i tāpirihia, ahakoa ka taea te whiwhi kaha pāmahana noa me te pāmahana iti teitei ake, ka heke te kaha nā te huringa tioata o te konupūmā aluminate i ngā pāmahana reo. He mārama, ka tauhohe te CaO whakaurua ki te SiO2 me te Al2O3 i roto i te mea whakarewa hei whakaputa i ētahi matū iti-ira rewa, ka hua ake te hekenga o ngā āhuatanga pāmahana teitei o te rauemi.
Ina whakamahia te hangarau paura tino pai, ngā ranunga tino whai hua me te whakarōpūtanga matūriki pūtaiao, ka whakaitihia te ihirangi sima o te mea whakarewa ki raro iho i te 8%, ā, ka whakaitihia te ihirangi wai ki te ≤7%, ā, ka taea te whakarite me te kawe mai i tētahi mea whakarewa ātete raupapa sima iti. Ko te ihirangi CaO he ≤2.5%, ā, ko ōna tohu mahi he nui ake i ngā mea whakarewa ātete sima aluminate. He pai te thixotropy o tēnei momo mea whakarewa ātete, arā, he āhua motuhake te rauemi whakaranu, ā, ka tīmata te rere me te iti o te kaha o waho. Ina tangohia te kaha o waho, ka mau tonu te āhua i whiwhihia. Nō reira, ka kiia hoki ko te mea whakarewa ātete thixotropic. Ko te mea whakarewa ātete rere-ake ka kiia hoki ko te mea whakarewa ātete thixotropic. Nō tēnei kāwai. Kāore anō kia tautuhia te tikanga tika o ngā mea whakarewa ātete raupapa sima iti. Ka tautuhia, ka whakarōpūhia hoki e te American Society for Testing and Materials (ASTM) ngā mea whakarewa ātete i runga i te ihirangi CaO.
Ko te matotoru me te kaha teitei ngā āhuatanga tino pai o ngā mīhini whakarewa sima-iti. He pai tēnei mō te whakapai ake i te roa o te mahi me te mahi a te hua, engari he raruraru anō hoki ki te tunu i mua i te whakamahinga, arā, ka taea te ringihia ngāwari mēnā kāore koe e tūpato i te wā e tunu ana. Ko te āhuatanga o te pahūtanga tinana me riringi anō i te iti rawa, ka tūpono rānei ki te haumaru whaiaro o ngā kaimahi e karapoti ana i ngā wā tino kino. Nō reira, kua whakahaerehia hoki e ngā whenua maha ngā rangahau mō te tunu i ngā mīhini whakarewa sima-iti. Ko ngā mahi hangarau matua ko: mā te hanga i ngā kōpiko oumu whaitake me te whakauru i ngā kaihoko ārai-pahū pai rawa atu, me ētahi atu, ka taea e tēnei te whakakore i te wai o ngā mīhini whakarewa sima-iti me te kore e puta he pānga taha.
Ko te hangarau paura tino pai te hangarau matua mō ngā mea whakarewa ātete-iti-sima (i tēnei wā, ko te nuinga o ngā paura tino pai e whakamahia ana i roto i ngā uku me ngā rauemi ātete-sima kei waenga i te 0.1 me te 10m, ā, ko te nuinga o ēnei he whakaterenga marara me te whakakīkī hanganga). Mā te mea tuatahi ka marara rawa ngā matūriki sima me te kore e pupuhi, ko te mea tuarua ka whakakīia ngā pore iti i roto i te tinana ringihanga, ā, ka whakapai ake i te kaha.
Ko ngā momo paura tino pai e whakamahia whānuitia ana i tēnei wā ko te SiO2, α-Al2O3, Cr2O3, me ētahi atu. Ko te horahanga mata motuhake o te paura iti SiO2 he tata ki te 20m2/g, ā, ko tōna rahi matūriki he tata ki te 1/100 o te rahi matūriki sima, nō reira he pai ngā āhuatanga whakakī. Hei tāpiri, ka taea hoki e te paura iti SiO2, Al2O3, Cr2O3, me ētahi atu te hanga matūriki colloidal i roto i te wai. Ina he mea whakamarara, ka hangaia he paparanga hiko takirua ki runga i te mata o ngā matūriki hei whakaputa i te aukati hiko, e wikitoria ana i te kaha van der Waals i waenga i ngā matūriki, ā, ka whakaiti i te kaha atanga. Ka ārai i te mimiti me te rere i waenga i ngā matūriki; i te wa ano, ka mimiti te mea whakamarara huri noa i ngā matūriki hei hanga i tētahi paparanga whakarewa, e whakanui ana hoki i te rere o te mea whakarewa. Koinei hoki tētahi o ngā tikanga o te paura tino pai, arā, mā te tāpiri i te paura tino pai me ngā mea whakamarara tika ka taea te whakaiti i te whakamahinga wai o ngā mea whakarewa ātete me te whakapai ake i te rere.
Ko te whakatūnga me te whakapakeketanga o ngā mea whakarewa iti-sima ātete-kore he hua o te mahi tahi o te hononga waikura me te hononga piripono. Ko te waikura me te whakapakeketanga o te sima konupūmā aluminate te nuinga o te wā ko te waikura o ngā wāhanga waipēhi CA me CA2 me te tukanga tipu tioata o ō rātou waikura, arā, ka tauhohe rātou ki te wai hei hanga i te kirikiri hexagonal, i te CAH10, C2AH8 rānei, me ngā hua waikura pērā i ngā tioata C3AH6 poraka me ngā kirikiri Al2O3аq, kātahi ka hanga he hanganga whatunga whakapūpū-whakapūpū honohono i te wā o te whakamaroke me te whakamahana. Ko te whakakotahitanga me te hononga nā te paura SiO2 tino pai e hanga ana i ngā matūriki colloidal ina tūtaki ki te wai, ā, ka tūtaki ki ngā katote kua wehea āta mai i te tāpiringa tāpiri (arā, te matū electrolyte). Nā te mea he rerekē ngā utu mata o ngā mea e rua, arā, kua piri te mata colloid ki ngā katote whakahē, ka heke te pūmanawa £2, ā, ka puta te whakapūpū ina tae te whakapūpū ki te "ira isoelectric". Arā, ina iti iho te ātete hiko i runga i te mata o ngā matūriki colloidal i tōna kukume, ka puta te hononga piripono mā te āwhina o te kaha van der Waals. I muri i te whakakōkī o te whakarewa ātete i konatunatua ki te paura silica, ka whakamaroketia ngā rōpū Si-OH i hangaia i runga i te mata o te SiO2, ka whakamaroketia kia piri ai, ka hanga he hanganga whatunga siloxane (Si-O-Si), ā, ka whakapakeke. I roto i te hanganga whatunga siloxane, kāore ngā hononga i waenga i te silicon me te hāora e heke ana i te pikinga o te pāmahana, nō reira ka piki tonu te kaha. I taua wā anō, i ngā pāmahana teitei, ka tauhohe te hanganga whatunga SiO2 ki te Al2O3 kua takaihia ki roto hei hanga mullite, ka taea te whakapai ake i te kaha i ngā pāmahana reo me te pāmahana teitei.
Te wā tuku: 28-Pepuere-2024
