Ngā Ngongo Tiaki Karāpire Hiraka Herea Nitride: Ngā Whakamahinga Matua mō ngā Ahumahi Pāmahana-Tiketike

II roto i ngā taiao ahumahi tino kino—e tohuhia ana e te pāmahana teitei, te waikura, me te memeha o te konganuku rewa—he mea nui te tiaki taputapu pono hei pupuri i te pai o te whakaputa me te kounga o te hua.Ngā ngongo tiaki karāhe silicon carbide (NBSiC) e herea ana ki te nitride, he rauemi hiato mahi-teitei i hangaia mai i te 70-80% silicon carbide (SiC) me te 20-30% silicon nitride (Si₃N₄), e tu ke ana me ngā āhuatanga tino pai: te ātete pāmahana teitei tae atu ki te 1450℃ (1650-1750℃ i roto i ngā āhuarangi motuhake), te ātete waikura/pakurakura pai rawa atu, te pumau o te ru wera, me te kawe wera teitei.Kei raro nei ngā tono matua o aua tono, e whakaatu ana i te huarahi e whakatau ai rātou i ngā raruraru matua mō ngā kaihanga o te ao.

1. Te Tiakitanga o te Thermocouple: Te Aroturukitanga Tika o te Pāmahana i ngā Āhuatanga Kino

He mea nui te whakahaere pāmahana mō te kounga me te haumaru o te ahumahi, ā, ko ngā thermocouples ngā taputapu matua mō te ine i te pāmahana. Heoi, i roto i ngā oumu pāmahana teitei, i ngā mīhini whakarewa konganuku kore-ferrous, me ngā taputapu maimoatanga wera, ka ngawari te pakaru o ngā thermocouples kāore i tiakina e te waikura, te waikura, te memeha rānei o te konganuku rewa—ka hua ake he pānui hē, he wā whakamutu kore i whakaritea, me ngā utu tiaki nui.Kua hangaia ngā ngongo tiaki NBSiC hei tiaki i ngā takirua wera, ā, koinei te mea pai rawa atu mō ngā āhuatanga aroturuki pāmahana tino kino.

Ko te iti o te tauwehenga whānui wera (4.4×10⁻⁶/℃) me te iti o te porosity (<1%) ka whakarite i te pumau o ngā āhuatanga me te ārai i te waikura mai i ngā hau waikawa/kawakore me ngā konganuku rewa. Me te pakeke Mohs ~9, ka ātete rātou ki te pakaru mai i ngā matūriki.Ko ngā tono matua ko ngā oumu hanga maitai, ngā oumu rewa konumohe, me ngā oumu uku, ka roa ake te roa o te ora o ngā ngongo NBSiC i te 3 ngā wā, neke atu rānei, ki te whakataurite ki ngā momo kē atu tuku iho.

2. Te Whakarewa me te Maka i te Mea Kore-Waro: Te Tiakitanga Tukanga Hira

He nui ngā wero e pā ana ki ngā ahumahi whakarewa/whakarewa konumohe, parahi, me te konutea: te horo o te konganuku rewa me ngā mōrearea o te poke.E rua ngā mahi matua a ngā ngongo tiaki NBSiC i konei, e whakarato ana i ngā otinga kua whakaritea.

a. Ngā Ngongo Hiri-Mutu mō te Tiaki i ngā Huānga Whakamahana

I roto i ngā oumu rewa konumohe, he mea nui ngā wāhanga whakamahana silicon carbide engari he ngoikore ki te horo o te konumohe rewa.Ko ngā ngongo NBSiC kua hiritia te pito he ārai, e wehe ana i ngā wāhanga whakamahana mai i te konganuku rewa hei whakaroa i tō rātou roa me te karo i te poke.Mā te kawe wera teitei ka pai te whakawhiti wera, ka whakaiti i te whakapaunga pūngao. Ka taea te whakarite i te diameter (tae atu ki te 600mm) me te roa (tae atu ki te 3000mm), ka urutau ki ngā hoahoa oumu rerekē.

b. Ngā Ārai mō te Maka Wiira Konumohe

Mā ngā ngongo whakaara NBSiC tuwhera-mutunga (ngā ngongo hiki) ka taea te whakahaere i te rere o te konumohe rewa mai i ngā oumu ki ngā pokepoke whakarewa i roto i te hanga wira konumohe. Mā te modulus matao o te pakaru >150MPa me te ātete pai ki te ru wera (e tu ana i te 100 huringa o te pāmahana rūma 1000℃), ka whakarite kia pumau, kia haere tonu te rere—ka whakaiti i ngā hapa whakarewa (porosity, whakaurunga) me te whakapai ake i te hua. Kāore i rite ki ngā ngongo rino whakarewa, kāore te NBSiC e whakapoke i te konumohe rewa, e tiaki ana i te parakore o te hua.