ʻO ka wehewehe nui o ka Reaction Bonded SiC

Generalawehewehe o kaPanePaʻa SiC

Loaʻa i ka Reaction Bonded SiC nā waiwai mechanical a me ke kūpaʻa ʻana. He haʻahaʻa kona kumukūʻai. I loko o ka nohona o kēia manawa, ua ʻoi aku ka nui o nā manaʻo ma nā ʻoihana like ʻole.

ʻO SiC kahi paʻa covalent ikaika loa. I ka sintering, haʻahaʻa loa ka diffusion rate. I ka manawa like, uhi pinepine ka ʻili o nā ʻāpana i kahi ʻāpana oxide lahilahi e pāʻani ana i ke ʻano o ka pale diffusion. ʻAʻole hiki ke hoʻopaʻa ʻia ʻo Pure SiC me ka ʻole o nā mea hoʻohui. ʻOiai inā hoʻohana ʻia ke kaʻina hana wela, pono ia e koho i nā mea hoʻohui kūpono. Ma nā wela kiʻekiʻe wale nō, hiki ke loaʻa nā mea kūpono no ka ʻenekinia kokoke i ka theoretical density e pono ai ma ka laulā mai 1950 ℃ a 2200 ℃. I ka manawa like, e kaupalena ʻia kona ʻano a me ka nui. ʻOiai hiki ke loaʻa nā composites SIC ma ka waiho ʻana i ka mahu, ua kaupalena ʻia i ka hoʻomākaukau ʻana i nā mea haʻahaʻa haʻahaʻa a i ʻole nā ​​​​mea ʻili lahilahi. No ka lōʻihi o kona manawa mālie, e hoʻonui ke kumukūʻai o ka hana.

Ua hoʻokumu ʻia ʻo Reaction Bonded SiC i ka makahiki 1950 e Popper. ʻO ke kumu kumu:

Ma lalo o ka hana o ka ikaika capillary, ke kilikaka wai a i ʻole ka huila silika me ka hana reactive i komo i loko o nā seramika porous i loaʻa ke kalapona a hana ʻia ke kalapona kalapona i ka hopena. Hoʻopiliʻia ka carbide silicon hou i nā'āpana carbide silicon mua i loko, a ua hoʻopihaʻia nā pores koena i loko o ka mea hoʻopihapiha me ka mea hana impregnating e hoʻopau i ke kaʻina hana densification.

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

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

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

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

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