He Tirohanga Hōhonu ki te Taimana Polycrystalline: Ngā Āhuatanga, te Hanganga, me ngā Whakamahinga
He rauemi whakamiharo te taimana polycrystalline (PCD) e whakakotahi ana i te pakeke whakamiharo me te ātete ki te kakahu o te taimana kotahi-kiriata me ngā painga tāpiri o te anisotropy whakarei ake me te ātete pānga, he rite ki ngā rauemi carbide. Nā ēnei āhuatanga ka tino pai te PCD mō ngā tono uaua, tae atu ki te tango hinu me te hau, te tūhuratanga waro me te whenua, me te tukatuka miihini.
Ngā Pūtake o te Taimana Polycrystalline
He maha ngā wā ka whakatauritea te taimana polycrystalline ki te taimana kotahi-kiriata tūturu, kua mōhiotia mō ōna āhuatanga tino pai. I roto i te taiao, ko tētahi atu momo taimana onge, e mōhiotia ana ko warowaihāi kitea he taimana pango rānei. He rerekē te carbonado i ngā taimana karaihe kotahi, he rauemi polycrystalline maha ngā tioata taimana iti, he mea whakaranu ki ngā paru iti. Nā tēnei hanganga ahurei, me te kore o ngā papa tapahi, ka hua ake he pakari, he kaha, he ātete ki te kakahu, he nui ake i ngā taimana karaihe kotahi tuku iho.
Ngā Tikanga Hanga o te Taimana Polycrystalline
Ko te hanganga o te taimana polycrystalline e hiahiatia ana he maha ngā tikanga matatau, he rerekē ngā painga me ngā wero o ia tikanga i runga i te whakamahinga e hiahiatia ana.
- Te Hanganga Pāhū:
I roto i tēnei tikanga, ka whakamahia ngā ipu ātete-pēhanga teitei hei whakamahi i te wera nui me te kaha nekeneke e puta mai ana i ngā pahūtanga. Ka pā te kaha hua ki ngā rau whakarewa ki runga i ngā rau karāpiti, ka hanga he taiao pāmahana teitei me te pēhanga teitei tere e huri ai te karāpiti hei taimana polycrystalline paura moroiti. Ahakoa he tere, he iti hoki te utu o tēnei tikanga, ka hua ake he polycrystals iti, kāore i te ōrite, ka whakawhāiti i tōna whakamahinga ki te PCD karaehe-whakakoi i te wāhi kāore te tika i te mea nui. - Te Whakatakotoranga Kohu Matū Pēhanga-Iti (CVD):
Mā te tukanga CVD pēhanga-iti ka whakauruhia ngā hau kei roto te waro ki roto i te rūma tauhohenga i raro i ngā āhuatanga iti iho i te 1 te pēhanga o te hau. Mā roto i tētahi raupapa tauhohenga matū, ka whakatakotoria ngā ngota waro mai i ngā rauemi hau ki runga i te mata o te papa i roto i te ahua o ngā kiriata taimana polycrystalline. Ka puta i tēnei tikanga he kiriata tino pumau me ngā āhuatanga wera pai rawa atu, me te kaha ki te whakauru i ngā huānga tāpiri mō ngā tono motuhake i roto i ngā hikohiko me ngā whatu. Heoi, he roa te wā hanga me te iti o te hua o te CVD, he wero tēnei mō te hanga tauine nui. - Tahuritanga Tika:
Ko tēnei tikanga matatau ko te huri i te paura moroiti karāpeti tino parakore ki te taimana polycrystalline mā te tuku ki te pēhanga tino teitei (neke atu i te 2000°C me te 13 GPa). Ko ngā āhuatanga mahi o ngā taimana ka puta he rite ki ngā taimana tūturu. Heoi, nā te nui o ngā whakaritenga pūngao me ngā tikanga uaua ka nui te utu me te kore e whai hua mō te whakamahinga ahumahi, ka tukuna ki ngā tautuhinga whakamātautau i tēnei wā. - Tikanga Whakarewa Pēhanga-Teitei Pāmahana-Teitei (HPHT):
I roto i tēnei tikanga hanga, ka hangaia ngā hiato taimana polycrystalline i raro i te pēhanga teitei (5–7 GPa) me te pāmahana (1300–1700°C) mā te whakamahi i te paura graphite, te paura taimana moroiti, me ngā konganuku whakawhiti, ngā whakakorikori koranu rānei. Ka tere ake te huringa hanga o tēnei tikanga, ā, he iti ake ngā whakaritenga taputapu ki te whakatauritea ki ētahi atu tikanga, ā, he pai mō te hanga ahumahi me te utu iti.
Ngā Āhuatanga me ngā Whakamahinga o te Taimana Polycrystalline
He mea motuhake te taimana polycrystalline nā tōna hanganga ahurei. Mā te whakaritenga matapōkere o ngā tioata taimana takitahi ka hangaia he rauemi e tino ōrite ana i roto i ōna āhuatanga ā-tinana me te matū, e whakaatu ana i te pakari me te mahi pai i ngā taha katoa. Nā te korenga o ngā papa tapahi ka whakarato i te ātete pānga pai ake, ka nui ake te ātete o te taimana polycrystalline ki te ru i ngā taimana tioata kotahi nui. Nā tēnei ka waiho hei whiringa pai mō ngā tono pānga nui e pakaru ana, e kino ana rānei ngā tioata takitahi.
Nā te iti o te utu whakaputa ki te whakataurite ki ngā taimana kotahi-kiriata nui, ka taea te whakaputa i te taimana polycrystalline i roto i ngā momo āhua hei whakatutuki i ngā hiahia ahumahi motuhake. He tino pakari, he tino kaha hoki tōna, ā, he rauemi tino whai hua mō te whānuitanga o ngā tono, tae atu ki:
- Ngā Utauta Keri me te Tapahi Ahumahi:E whakamahia whānuitia ana te taimana polycrystalline ki te hanga taputapu tapahi me te keri mahi teitei, inā koa mō ngā rauemi uaua pēnei i te toka, te raima, me ngā konganuku mārō.
- Te Tūhuratanga Hinu me te Hau:Nā tōna ātete ki te kakahu me te pānga, he rauemi pai rawa atu te PCD mō ngā taputapu keri me te tango i roto i te umanga hinu me te hau.
- Te Keri me te Matawhenua:He pakari, he roa hoki te wā e whakamahia ai te PCD i roto i ngā taputapu keri mō te keri i roto i te toka mārō me te tūhuratanga whenua.
- Te Hanga Tika:I roto i te tukatuka me te hanga miihini, ka whakamahia te taimana polycrystalline ki ngā rauemi whakakoi hei whakatutuki i ngā hua tino tika.
Whakamutunga
Kua noho te taimana polycrystalline hei rauemi tūāpapa i roto i ngā momo ahumahi, nā tōna pakeke, tōna kaha, me tōna whānui. Ko te kaha ki te hanga PCD mā te whakamahi i ngā tikanga rerekē, pērā i te hanga pahūtanga, te whakatakotoranga kohu matū, me ngā tikanga pāmahana teitei-pēhanga teitei, ka mau tonu tōna hiranga ki te hanga taputapu me ngā mīhini matatau. Mā te whakakotahitanga o te pakari o te taumata ahumahi me te hanga utu-whai hua, ka mau tonu te tūranga nui o te taimana polycrystalline i roto i ngā hangarau tuku iho me ngā hangarau hou.