Ka wehewehe laulā o ka Reaction Bonded SiC

Nuika wehewehe ʻana o kaPaneSiC i hoʻopaʻa ʻia

Loaʻa i ka Reaction Bonded SiC nā waiwai mechanical a me ke kūpaʻa oxidation. He haʻahaʻa kona kumukūʻai. I ke kaiāulu o kēia wā, ua huki mai ia i nā manaʻo hou aʻe i nā ʻoihana like ʻole.

He pilina covalent ikaika loa ka SiC. I ka sintering, haʻahaʻa loa ka nui o ka diffusion. I ka manawa like, uhi pinepine ka ʻili o nā ʻāpana i kahi papa oxide lahilahi e pāʻani ana i ke kuleana o ka pale diffusion. ʻAʻole sintered a compact ka SiC maʻemaʻe me ka ʻole o nā mea hoʻohui sintering. ʻOiai inā hoʻohana ʻia ke kaʻina hana kaomi wela, pono nō hoʻi e koho i nā mea hoʻohui kūpono. Ma nā mahana kiʻekiʻe loa wale nō, hiki ke loaʻa nā mea kūpono no ka density engineering kokoke i ka density theoretical e pono ai ma ka pae mai 1950 ℃ a i 2200 ℃. I ka manawa like, e kaupalena ʻia kona ʻano a me ka nui. ʻOiai hiki ke loaʻa nā composites SIC ma o ka hoʻokaʻawale mahu, ua kaupalena ʻia i ka hoʻomākaukau ʻana i nā mea density haʻahaʻa a i ʻole nā ​​​​mea papa lahilahi. Ma muli o kona manawa mālie lōʻihi, e piʻi aʻe ke kumukūʻai o ka hana ʻana.

Ua hana ʻia ʻo Reaction Bonded SiC i nā makahiki 1950 e Popper. ʻO ke kumumanaʻo kumu:

Ma lalo o ka hana a ka ikaika capillary, ua komo ka silicon wai a i ʻole ka hui silicon me ka hana reactive i loko o nā keramika porous i loaʻa ke kalapona a ua hana ʻia ka silicon kalapona i ka hopena. Hoʻopili ʻia ka silicon carbide i hana hou ʻia i nā ʻāpana silicon carbide mua ma kahi, a ua hoʻopiha ʻia nā pores i koe i loko o ka mea hoʻopihapiha me ka mea hoʻopili e hoʻopau i ke kaʻina hana densification.

Ke hoʻohālikelike ʻia me nā kaʻina hana ʻē aʻe o nā keramika silicon carbide, ʻo ke kaʻina hana sintering nā ʻano penei:

Haʻahaʻa ka mahana hana, pōkole ka manawa hana, ʻaʻohe pono o nā lako kūikawā a pipiʻi paha;

Nā ʻāpana i hoʻopaʻa ʻia me ka ʻole o ka emi ʻana a i ʻole ka loli o ka nui;

Nā ʻano hoʻoheheʻe like ʻole (extrusion, injection, kaomi a me ka ninini ʻana).

Aia kekahi mau ʻano hana hou aʻe no ke ʻano ʻana. I ka wā o ka sintering, hiki ke hana ʻia nā huahana nui a paʻakikī me ka ʻole o ke kaomi ʻana. Ua aʻo ʻia ka ʻenehana Reaction Bonded o ka silicon carbide no ka hapalua kenekulia. Ua lilo kēia ʻenehana i hoʻokahi o nā mea nui o nā ʻoihana like ʻole ma muli o kona mau pono kūikawā.