Te whakamahana tauhohenga
Te tauhohenga whakatāuku karāhe siliconKo te tukanga whakaputa ko te whakakīkī uku, te whakakīkī i te kaihoko urunga rerenga sintering, te whakarite hua uku sintering tauhohenga, te whakarite uku rakau silicon carbide me ētahi atu mahi.
Pūwero karawiti silicon sintering tauhohenga
Tuatahi, 80-90% o te paura uku (he mea tito mai i te kotahi, e rua rānei ngā paura opaura karawiti siliconme te paura boron carbide), 3-15% o te paura pūtake waro (he mea tito mai i te kotahi, e rua rānei o te pango waro me te kapia phenolic) me te 5-15% o te kaihoko whakapūkara (kapia phenolic, polyethylene glycol, hydroxymethyl cellulose, paraffin rānei) ka whakaranua kia ōrite mā te whakamahi i te mira pōro hei whiwhi i te paura whakaranu, ka whakamarokehia, ka whakapūkarahia, kātahi ka pēhia ki roto i te pokepoke hei whiwhi i te kiato uku me ngā āhua motuhake.
Tuarua, ka whakaranua kia ōrite te paura silicon 60-80%, te paura silicon carbide 3-10% me te paura boron nitride 37-10%, kātahi ka pēhia ki roto i te pokepokea ai kia whiwhi ai i te matū whakauru rerenga sintering kia kikī.
Kātahi ka whakatakotoria ngātahitia te konganuku whakarewa me te konganuku whakarewa kua whakatōkia, ā, ka whakanuia te pāmahana ki te 1450-1750℃ i roto i te oumu korehau me te nekehanga korehau kāore i raro iho i te 5×10-1 Pa hei whakatōkia me te tiaki wera mō te 1-3 hāora kia puta ai he hua konganuku whakarewa kua tauhohe. Ka tangohia te toenga konganuku whakarewa i runga i te mata o te konganuku whakarewa mā te patopato kia puta ai he rau konganuku matotoru, ā, ka mau tonu te āhua taketake o te konganuku whakarewa.
Hei whakamutunga, ka whakamahia te tukanga whakamahana tauhohenga, arā, ka uru te silicon wai, te koranu silicon rānei me te mahi tauhohenga i te pāmahana teitei ki roto i te papa uku porous kei roto te waro i raro i te mahi a te kaha capillary, ka tauhohe ki te waro i roto hei hanga i te silicon carbide, ka whānui te rōrahi, ā, ka whakakīia ngā pore e toe ana ki te silicon huānga. Ka taea te whakamahi i te waro parakore, te silicon carbide/te rauemi hiato waro rānei hei hanga i te mea tuatahi. Ka whiwhihia te mea tuatahi mā te whakaora me te whakakorikori i te kapia waro, te kaihanga pore me te whakarewa mā te whakamahi i te whakakorikori. Ka whiwhihia te mea whakamutunga mā te whakakorikori i ngā matūriki silicon carbide/te rauemi hiato kapia hei hanga i ngā rauemi hiato silicon carbide/te waro, mā te whakamahi rānei i te α-SiC me te paura waro hei rauemi tīmatanga me te whakamahi i te tukanga pēhi, te tukanga werohanga rānei hei hanga i te rauemi hiato.
Te whakakorikori kore-pēhanga
Ka taea te wehewehe i te tukanga sintering kore-pēhanga o te silicon carbide ki te sintering totoka-wāhanga me te sintering wai-wāhanga. I ngā tau tata nei, kua piki ake te rangahau mōngā uku karāhe siliconi te kāinga me tāwāhi kua arotahi te nuinga ki te sintering wai-āhuatanga. Ko te tukanga whakarite uku ko: te mira pōro rauemi whakauru–>te whakapūkara rehu–>te pēhi maroke–>te whakapakeke tinana matomato–>te sintering korehau.
Ngā hua karawiti silicon kua whakakikoruatia kore-pēhanga
Tāpirihia he 96-99 wāhanga o te paura silicon carbide ultrafine (50-500nm), 1-2 wāhanga o te paura boron carbide ultrafine (50-500nm), 0.2-1 wāhanga o te nano-titanium boride (30-80nm), 10-20 wāhanga o te kapia phenolic wairewa-wai, me te 0.1-0.5 wāhanga o te dispersant tino whai hua ki te mira pōro mō te mira pōro me te whakaranu mō ngā hāora 24, ka maka te paraoa whakaranu ki roto i te oko whakaranu hei whakaoho mō ngā hāora 2 hei tango i ngā mirumiru i roto i te paraoa.
Ka rehuhia te ranunga i runga ake nei ki roto i te pourewa whakapūpū, ā, mā te whakahaere i te pēhanga rehu, te pāmahana tomo hau, te pāmahana putanga hau me te rahi o te matūriki pepa rehu ka whiwhi i te paura whakapūpū he pai te āhua o te matūriki, he pai te rere, he whaiti te whānuitanga tohatoha matūriki me te makuku taurite. Ko te huringa auau porowhita he 26-32, ko te pāmahana tomo hau he 250-280℃, ko te pāmahana putanga hau he 100-120℃, ā, ko te pēhanga tomo paru he 40-60.
Ka whakanohoia te paura kirikiri i runga ake nei ki roto i te pokepokea ai te karawaka sima hei pēhi kia puta he tinana matomato. Ko te tikanga pēhi he pēhanga taha-rua, ā, ko te taumaha o te pēhanga o te taputapu mīhini he 150-200 tana.
Ka whakatakotoria te tinana matomato kua pēhia ki roto i te oumu whakamaroke hei whakamaroke, hei whakamaroke hoki kia puta ai he tinana matomato me te kaha pai o te tinana matomato.
Ka whakanohoia te tinana matomato kua rongoatia i runga ake nei ki roto i teoko paraiheā, ka whakaritea kia tata, kia ātaahua hoki, kātahi ka whakanohoia te para karāpeti me te tinana matomato ki roto i te oumu wera korehau pāmahana teitei hei tahu. Ko te pāmahana tahu he 2200-2250℃, ā, ko te wā whakamahana he 1-2 hāora. Hei whakamutunga, ka whiwhihia he uku karāpeti silicon carbide kua werahia, kāore he pēhanga, he mahi teitei.
Te whakatōtōtanga ā-wāhanga totoka
Ka taea te wehewehe i te tukanga sintering kore-pēhanga o te silicon carbide ki te sintering ā-wāhanga-totoka me te sintering ā-wāhanga-wai. Ko te sintering ā-wāhanga-wai me tāpiri atu ngā tāpiri sintering, pērā i ngā tāpiri rua me ngā tāpiri tuatoru Y2O3, kia puta ai te sintering ā-wāhanga-wai o te SiC me ōna rauemi hiato, kia tutuki ai te whakakīkī i te pāmahana iti iho. Ko te tikanga whakarite o ngā uku silicon carbide sintering ā-wāhanga-totoka ko te whakaranu i ngā rauemi mata, te whakapūkara rehu, te whakahāngai, me te sintering korehau. Ko te tukanga whakaputa motuhake e whai ake nei:
Ka whakanohoia te 70-90% o te submicron α silicon carbide (200-500nm), te 0.1-5% o te boron carbide, te 4-20% o te kapia, me te 5-20% o te here waro ki roto i te mīhini whakaranu, ā, ka tāpirihia he wai parakore hei whakaranu māku. I muri i ngā hāora 6-48, ka tukuna te paraoa pokepoke i roto i te tatari 60-120 mata;
Ka rehuhia te paru kua tātarihia mā roto i te pourewa rehu. Ko te pāmahana tomo o te pourewa rehu he 180-260℃, ā, ko te pāmahana putanga he 60-120℃; ko te matotoru o te rauemi he 0.85-0.92g/cm3, ko te rere o te wai he 8-11s/30g; ka tātarihia te rauemi he 60-120 mata hei whakamahi i muri mai.
Tīpakohia he pokepokea ai kia rite ki te āhua o te hua e hiahiatia ana, utaina te rauemi kirikiri ki roto i te kōhao pokepokea ai, ka mahi i te pokepokea ai te pēhanga i te pāmahana rūma i te pēhanga o te 50-200MPa kia puta he tinana matomato; ka whakanoho rānei te tinana matomato i muri i te pokepokea ai ki roto i tētahi taputapu pēhi isostatic, ka mahi i te pēhi isostatic i te pēhanga o te 200-300MPa, ka puta he tinana matomato i muri i te pēhi tuarua;
Whakanohoia te tinana matomato kua whakaritea i ngā kaupae o runga ake nei ki roto i te oumu whakamahana korehau mō te whakamahana, ā, ko te mea kua tohua ko te uku ātete-matū silicon carbide kua oti; i roto i te tukanga whakamahana o runga ake nei, tuatahi tangohia te oumu whakamahana, ā, ina tae te nekehanga korehau ki te 3-5 × 10-2 i muri i te Pa, ka tukuna te hau korehau ki roto i te oumu whakamahana ki te pēhanga noa, kātahi ka whakamahana. Ko te whanaungatanga i waenga i te pāmahana whakamahana me te wā ko: te pāmahana rūma ki te 800 ℃, 5-8 hāora, te tiaki wera mō te 0.5-1 hāora, mai i te 800 ℃ ki te 2000-2300 ℃, 6-9 hāora, te tiaki wera mō te 1 ki te 2 hāora, kātahi ka whakamataohia ki te oumu ka heke ki te pāmahana rūma.
Hanganga moroiti me te rohe witi o te silicon carbide i whakakorikoria ki te pēhanga noa
I roto i ngā kupu poto, he pai ake te mahi a ngā uku i hangaia mā te tukanga sintering wera, engari he nui ake hoki te utu whakaputa; he nui ake ngā rauemi mata e hiahiatia ana mō ngā uku i hangaia mā te sintering kore pēhanga, he teitei ake te pāmahana sintering, he nui ngā panonitanga rahi hua, he uaua te tukanga me te iti o te mahi; he nui te kiato o ngā hua uku i hangaia mā te tukanga sintering tauhohenga, he pai te mahi ārai-poro, ā, he iti noa te utu whakarite. He painga me ngā ngoikoretanga o ngā tukanga whakarite sintering o ngā uku silicon carbide, ā, he rerekē anō hoki ngā āhuatanga tono. Ko te kaupapa here pai ko te whiriwhiri i te tikanga whakarite tika kia rite ki te hua me te kimi i te taurite i waenga i te utu iti me te mahi teitei.
Wā tuku: Oketopa-29-2024