ʻO ka graphite me ka uhi TaC

I. Kaʻina hana ʻimi hoʻohālikelike

1. Pūnaehana TaCl5-C3H6-H2-Ar

2. Ka wela waiho ʻana:

E like me ka thermodynamic formula, ua helu ʻia inā ʻoi aku ka mahana ma mua o 1273K, haʻahaʻa loa ka ikehu manuahi o ka Gibbs o ka pane ʻana a ua piha ka pane. Nui loa ka hopena o ka KP mau ma 1273K a piʻi wikiwiki me ka mahana, a lohi mālie ka ulu ulu ma 1773K.

Ka hopena i ka morphology o ka ili o ka uhi: Inā ʻaʻole kūpono ka mahana (kiʻekiʻe a haʻahaʻa paha), hōʻike ka ʻili i kahi morphology kalapona manuahi a i ʻole nā ​​pores wehe.

(1) I nā wela kiʻekiʻe, ʻoi aku ka wikiwiki o ka neʻe ʻana o nā atom reactant ikaika a i ʻole nā ​​​​hui, e alakaʻi i ka hāʻawi like ʻole i ka wā o ka hōʻiliʻili ʻana o nā mea, a ʻaʻole hiki i nā wahi waiwai a me ka ʻilihune ke hoʻololi mālie, e hopena i nā pores.

(2) Aia ka ʻokoʻa ma waena o ka pirolysis reaction rate o nā alkanes a me ka ho'ēmi ʻana o ka hopena o ka tantalum pentachloride. ʻOi aku ka nui o ke kalapona pyrolysis a ʻaʻole hiki ke hoʻohui ʻia me ka tantalum i ka manawa, no laila ua uhi ʻia ka ʻili e ke kalapona.

Ke kūpono ka mahana, ka ili o kaka uhi ʻana o TaChe paapu.

TaChehee a hui pu kekahi me kekahi, ua piha ke ano aniani, a holo malie ka palena o ka palaoa.

3. Lakiō hydrogen:

Eia kekahi, nui nā kumu e pili ana i ka maikaʻi o ka uhi:

-Ka maikaʻi o ka lepo lepo

-Deposition kinoea kahua

-Ka degere o ka like ole o ka hui kinoea reactant

II. Nā hemahema maʻamau oka uhi ʻana o ka tantalum carbide

1. Ka uhi ʻana i ka māhā a me ka ʻili

Linear thermal expansion coefficient linear CTE:

2. Ka nānā 'ana i nā hemahema:

(1) Ke kumu:

(2) Keʻano hōʻailona

① E hoʻohana i ka ʻenehana X-ray diffraction no ke ana ʻana i ke koena koʻikoʻi.

② E hoʻohana i ke kānāwai o Hu Ke e hoʻohālikelike i ke koʻikoʻi i koe.

(3) Nā papa kuhikuhi pili

3.E hoʻonui i ka hoʻopili mechanical o ka uhi a me ka substrate

(1) Ka uhi ulu in-situ

ʻO ka hoʻoheheʻe ʻana i ka wela a me ka ʻenehana diffusion TRD

Kaʻina paʻakai hoʻoheheʻe

E maʻalahi i ka hana hana

E hoʻohaʻahaʻa i ka mahana hopena

Ke kumu kūʻai haʻahaʻa haʻahaʻa

ʻOi aku ka pili kaiapuni

He kūpono no ka hana ʻoihana nui

(2) Ka uhi hoʻololi hoʻohuihui

Kaʻina hoʻomoe hui

CVDkaʻina hana

ʻO ka uhi ʻana i nā mea he nui

Hoʻohui i nā pono o kēlā me kēia māhele

Hoʻololi maʻalahi i ka haku mele ʻana a me ka ʻāpana

4. ʻO ka hoʻoheheʻe ʻana i ka wela a me ka ʻenehana diffusion TRD

(1) Mechanism Reaction

Ua kapa ʻia ka ʻenehana TRD i ke kaʻina hana hoʻopili, e hoʻohana ana i ka boric acid-tantalum pentoxide-sodium fluoride-boron oxide-boron carbide system e hoʻomākaukau ai.ka uhi ʻana o ka tantalum carbide.

① Hoʻoheheʻe ka wai boric i hoʻoheheʻe ʻia i ka tantalum pentoxide;

② Hoʻemi ʻia ka tantalum pentoxide i nā ʻātoma tantalum ikaika a pālahalaha ma ka ʻili graphite;

③ Hoʻopili ʻia nā ʻātoma tantalum ikaika ma ka ʻili o ka graphite a hana me nā ʻātoma kalapona e hana.ka uhi ʻana o ka tantalum carbide.

(2) Kī Pane

Pono ke ʻano o ka uhi carbide e ʻoi aku ka kiʻekiʻe ma mua o ka boron oxide.

He haʻahaʻa haʻahaʻa ka ikehu manuahi o Gibbs o ka carbide (inā ʻaʻole, hiki ke hana ʻia ka boron a i ʻole ka boride).

ʻO ka tantalum pentoxide he ʻokikene kūʻokoʻa. I loko o ka borax hoʻoheheʻe kiʻekiʻe, hiki iā ia ke hana me ka alkaline oxide sodium oxide ikaika e hana i ka sodium tantalate, a laila e hōʻemi i ka wela o ka hopena mua.