Nā ʻAno Hana no nā Keramika Silicon Carbide

Nā ʻAno Hana no nā Keramika Silicon Carbide: He ʻIke Holoʻokoʻa

ʻO ke ʻano kūikawā o ke aniani a me nā waiwai o nā keramika silicon carbide e hāʻawi i kona mau waiwai maikaʻi loa. Loaʻa iā lākou ka ikaika maikaʻi loa, ka paʻakikī kiʻekiʻe loa, ke kūpaʻa ʻana i ka ʻaʻahu maikaʻi loa, ke kūpaʻa i ka pala, ke alakaʻi wela kiʻekiʻe a me ke kūpaʻa haʻalulu wela maikaʻi. ʻO kēia mau waiwai e kūpono ai nā keramika silicon carbide no nā noi ballistic.

ʻO ka hana ʻana o nā keramika silicon carbide e hoʻohana pinepine i nā ʻano hana penei:

1. Hoʻoheheʻe ʻia ʻana o ka compression: ʻO ke ʻano hoʻoheheʻe ʻia ʻana o ka compression kahi ʻano hana i hoʻohana nui ʻia no ka hana ʻana i nā pepa pale pale silicon carbide. He maʻalahi ke kaʻina hana, maʻalahi e hana, kiʻekiʻe ka pono a kūpono no ka hana mau.

2. Hoʻoheheʻe ʻia ka inikini: Loaʻa i ka hoʻoheheʻe ʻia ka inikini ka hiki ke hoʻololi maikaʻi loa a hiki ke hana i nā ʻano a me nā hale paʻakikī. He mea pono loa kēia ʻano hana i ka wā e hana ai i nā ʻāpana seramika silicon carbide i hoʻohālikelike ʻia.

3. Kaomi isostatic anu: Pili ke kaomi isostatic anu i ka hoʻopili ʻana o ka ikaika like i ke kino ʻōmaʻomaʻo, e hopena ana i ka hoʻolaha like ʻana o ka density. Hoʻomaikaʻi nui kēia ʻenehana i ka hana huahana a kūpono no ka hana ʻana i nā keramika carbide silicon hana kiʻekiʻe.

4. Hoʻoheheʻe ʻia ka gel injection: He ʻano hoʻoheheʻe hou ka hoʻoheheʻe ʻia ʻana o ka gel injection kokoke i ka nui o ka ʻupena. Loaʻa i ke kino ʻōmaʻomaʻo i hana ʻia ke ʻano like a me ka ikaika kiʻekiʻe. Hiki ke hana ʻia nā ʻāpana seramika i loaʻa e nā mīkini like ʻole, kahi e hoʻemi ai i ke kumukūʻai o ka hana ʻana ma hope o ka sintering. He kūpono loa ka hoʻoheheʻe ʻia ʻana o ka gel injection no ka hana ʻana i nā seramika silicon carbide me nā ʻano paʻakikī.

Ma ka hoʻohana ʻana i kēia mau ʻano hana, hiki i nā mea hana ke loaʻa nā keramika silicon carbide kiʻekiʻe me nā waiwai mechanical a me ballistic maikaʻi loa. ʻO ka hiki ke hana i nā keramika silicon carbide i nā ʻano like ʻole a me nā hale e ʻae ai i ka hoʻopilikino ʻana a me ka hoʻonui ʻana e hoʻokō i nā koi kikoʻī o nā noi like ʻole.

Eia kekahi, ʻo ke kumukūʻai kūpono o nā keramika silicon carbide e hoʻonui ai i kona hoihoi ma ke ʻano he mea pale ballistic kiʻekiʻe. ʻO kēia hui pū ʻana o nā waiwai i makemake ʻia a me ke kumukūʻai kūpono e hoʻolilo ai i nā keramika silicon carbide i mea hoʻokūkū ikaika i ka wahi pale kino.

I ka hopena, ʻo nā keramika silicon carbide nā mea ballistic alakaʻi ma muli o ko lākou mau waiwai maikaʻi loa a me nā ʻano hana hoʻoheheʻe like ʻole. ʻO ke ʻano kristal, ka ikaika, ka paʻakikī, ke kū'ē ʻana i ka ʻaʻahu, ke kū'ē ʻana i ka palaho, ka conductivity thermal a me ke kū'ē ʻana i ka haʻalulu thermal o nā keramika silicon carbide e hoʻolilo iā lākou i koho hoihoi no nā mea hana a me nā mea noiʻi. Me nā ʻano hana hoʻokumu like ʻole, hiki i nā mea hana ke hoʻopilikino i nā keramika silicon carbide e hoʻokō i nā noi kikoʻī, e hōʻoiaʻiʻo ana i ka hana maikaʻi loa a me ka pale. He mea hoʻohiki ka wā e hiki mai ana o nā keramika silicon carbide i ko lākou hoʻomau ʻana i ka hoʻomohala a me ka hana maikaʻi ma ke kahua o nā mea ballistic.

No ka pale ʻana i ka ballistic, ua hōʻoia ʻia ka hui pū ʻana o nā pepa polyethylene a me nā mea hoʻokomo keramika he mea kūpono loa. Ma waena o nā koho keramika like ʻole i loaʻa, ua huki nui ka silicon carbide i ka nānā ʻana ma ka home a ma waho. I nā makahiki i hala iho nei, ua ʻimi nā mea noiʻi a me nā mea hana i ka hiki o nā keramika silicon carbide ma ke ʻano he mea pale ballistic kiʻekiʻe ma muli o kona mau waiwai maikaʻi loa a me ke kumukūʻai haʻahaʻa.

He hui ka silicon carbide i hoʻokumu ʻia ma ke kau ʻana i nā tetrahedrons Si-C, a he ʻelua ʻano kristal, ʻo α a me β. Ma kahi mahana sintering ma lalo o 1600°C, aia ka silicon carbide ma ke ʻano o β-SiC, a i ka wā e ʻoi aku ai ka mahana ma mua o 1600°C, hoʻololi ka silicon carbide i α-SiC. He ikaika loa ka pilina covalent o ka α-silicon carbide, a hiki iā ia ke mālama i kahi pilina ikaika kiʻekiʻe ma nā mahana kiʻekiʻe.