Tungsten na alloys nwere ike ijikọ nke ọma site na ịgbado ọkụ tungsten-arc gas,
gas tungsten-arc braze ịgbado ọkụ, eletrọn doo ịgbado ọkụ na site kemịkalụ uzuoku ntinye.

Atụlela ịdị mma nke tungsten na ọtụtụ alloys ya gbakọtara site na nkedo arc, metallurgy powder, ma ọ bụ teknụzụ-vepor deposition (CVD). Ọtụtụ n'ime ihe ndị e ji mee ihe bụ 0.060 in. oké mpempe akwụkwọ. Usoro ejikọtara n'ọrụ bụ (1) gas tungsten-arc ịgbado ọkụ, (2) gas tungsten-arc braze ịgbado ọkụ, (3) eletrọn beam ịgbado ọkụ na (4) isonyere site CVD.
Ụzọ ndị a niile gbakọtara Tungsten nke ọma mana ịdị mma nke welds nwere mmetụta dị ukwuu site n'ụdị isi na igwe ndochi (ya bụ ntụ ntụ ma ọ bụ ngwaahịa arc-cast). Dịka ọmụmaatụ, welds dị n'ihe nkedo arc enweghị ntụsara ahụ ma ọ bụrụ na welds dị na ngwaahịa ọla ntụ ntụ na-abụkarị oghere, ọkachasị n'ahịrị ngwakọta. N'ihi na gas tungsten-arc (GTA) welds na 1 / 1r, in. unalloyed tungsten mpempe akwụkwọ, a kacha nta preheat nke 150 ° C (nke a chọpụtara na ọ bụ ductileto-brittle mgbanwe okpomọkụ nke isi metal) na-emepụta welds free nke cracks. Dị ka ọla ntọala, tungsten-rhenium alloys bụ weldable na-enweghị preheat, ma porosity bụkwa nsogbu na tungsten alloy ntụ ntụ ngwaahịa. Preheating pụtara na ọ dịghị emetụta weld porosity nke bụ isi ọrụ nke ụdị isi metal.
The ductile-to-brittle Transition ternperatures (DBIT) maka gas tungsten-arc welds n'ụdị dị iche iche nke ntụ ntụ metallurgy tungsten bụ 325 ka 475 Celsius C, ma e jiri ya tụnyere 150. C maka isi metal na nke 425 ° C maka electron beamwelded. arc-nkedo tungsten.
Ịgbado ọkụ nke tungsten nwere ọla ndị na-ejupụta ụdị ihe ahụ arụpụtaghị ihe njikọ dị mma karịa usoro njikọ ndị ọzọ. Anyị na-eji Nb, Ta, W-26% Re, Mo na Re dị ka igwe na-ejuputa na welds braze. Nb na Mo butere nnukwu mgbawa.

Jikọọ na CVD na 510 ruo 560°C

kpochapụrụ ihe niile ma ọ bụ obere porosity ma kpochapụ nsogbu ndị metụtara oke okpomọkụ dị mkpa maka ịgbado ọkụ (dịka nnukwu ọka na weld na mpaghara okpomọkụ na-emetụta).
Okwu mmalite
A na-atụle Tungsten na tungsten-base alloys maka ọtụtụ ngwa nuklia dị elu na oghere oghere gụnyere ngwaọrụ ntụgharị thermionic, ụgbọ ala reentry, ihe mmanụ ọkụ dị elu na ihe ndị ọzọ. Uru nke ihe ndị a bụ nchikota ha nke okpomọkụ na-agbaze nke ukwuu, ike dị mma na okpomọkụ dị elu, okpomọkụ dị elu na ọkụ eletrik na nguzogide zuru oke na corrosion na gburugburu ụfọdụ. Ebe ọ bụ na nrịkasi ike na-amachi nrụpụta ha, uru nke ihe ndị a na akụrụngwa arụrụ arụ n'okpuru ọnọdụ ọrụ siri ike na-adabere n'ụzọ dị ukwuu na mmepe nke usoro ịgbado ọkụ iji nye nkwonkwo ndị yiri n'ihe onwunwe na metal ala. Ya mere, ebumnobi nke ọmụmụ ndị a bụ (1) chọpụta ihe arụrụ arụ nke nkwonkwo na-emepụta site na ụzọ njikọ dị iche iche n'ụdị dị iche iche nke tungsten na-enweghị alloyed na alloyed; (2) nyochaa mmetụta nke mgbanwe dị iche iche na ọgwụgwọ okpomọkụ na usoro njikọ; na (3) gosiputara ike nke imepụta akụrụngwa nnwale dabara maka ngwa akọwapụtara.
Akụrụngwa
Tungsten na-enweghị eriri m na 10 m. akwa ibé akwụkwọ bụ ihe kacha amasị. Emepụtara tungsten a na-adịghị ahụkebe n'ọmụmụ ihe a site na nchara ntụ ntụ, nkedo arc na usoro ntinye kemịkalụ-vepor. Tebụl 1 na-egosi ọkwa adịghị ọcha nke metallurgy ntụ ntụ, CVD na arc-cast tungsten ngwaahịa dị ka enwetara ya. Ọtụtụ na-ada n'ime oke a na-ahụ anya na tungsten

ma ekwesiri ighota na ihe CVD nwere otutu fluorine kariri norma.
Agbakwunyere nha na ụdị dị iche iche nke tungsten na tungsten alloys maka ntụnyere. Ọtụtụ n'ime ha bụ ngwaahịa ntụ ntụ n'agbanyeghị na ụfọdụ ihe nkedo arc na-agbadokwa. A na-eji nhazi dị iche iche eme ihe iji chọpụta ike nke ihe owuwu ụlọ na ihe ndị mejupụtara. A na-anata ngwongwo niile n'ọnọdụ ọrụ oyi zuru oke ma ewezuga CVD tungsten, nke a na-anata dịka nkwụnye ego. N'ihi nrịbawanye nke recrystallized na nnukwu grained tungsten a na-agbanye ihe ahụ n'ọnọdụ ọrụ iji belata uto ọka na mpaghara okpomọkụ. N'ihi ọnụ ahịa dị elu nke ihe onwunwe na ọnụ ọgụgụ dị nta dị, anyị haziri ihe nlele ule nke jiri ihe kacha nta mee ihe kwekọrọ n'inweta ozi achọrọ.
Usoro
Ebe ọ bụ na okpomọkụ mgbanwe ductile-to-brittle (DBTT) nke tungsten dị n'elu ọnụ ụlọ, a ghaghị iji nlezianya pụrụ iche na njikwa na nhazi iji zere mgbawa1. Ịkpụcha ajị anụ na-akpata mgbawa ọnụ, anyị achọpụtala na egweri na igwe eletrik na-ahapụ nlele okpomọkụ n'elu. Ọ gwụla ma ewepụrụ ha site n'ịkụ, mgbawa ndị a nwere ike ịgbasa n'oge ịgbado ọkụ na ojiji ọzọ.
Tungsten, dị ka ọla ndị na-emegharị emegharị, ga-agbanyerịrị na ikuku dị ọcha nke gas inert (gas tungsten-arc process) ma ọ bụ oghere (electron beam pro:: ess) 2 iji zere mmetọ nke weld site na interstitials. Ebe tungsten nwere ebe mgbaze kacha elu nke ọla niile (3410°C), akụrụngwa ịgbado ọkụ ga-enwerịrị ike iguzogide okpomọkụ ọrụ dị elu.

Tebụl 1

A na-eji usoro ịgbado ọkụ atọ dị iche iche: ịgbado ọkụ tungsten-arc gas, tungsten-arc braze welding na electron beam ịgbado ọkụ. Achọpụtara ọnọdụ ịgbado ọkụ dị mkpa maka pcnetration zuru oke na ntinye ike kacha nta maka ihe ọ bụla. Tupu ịgbado ọkụ, a na-awụnye ihe mpempe akwụkwọ n'ime 囚in. obosara oghere na dereased na ethyl mmanya. Nhazi nkwonkwo ahụ bụ oghere square na-enweghị oghere mgbọrọgwụ.
Gas Tungsten-Arc Welding
Emere akpaaka niile na gas tungsten-arc weld n'ime ehamher nke edobere n'okpuru 5 x I ma ọ bụ. torr ihe dị ka elekere 1 wee jupụta na argon dị ọcha. Dị ka egosiri na fig. lA, ụlọ ahụ nwere usoro njem na isi ọkụ maka ịgbado ọkụ akpaka. Ejidere ihe a na-arụ ọrụ na nrụnye ọla kọpa nyere ya na ntinye tungsten n'ebe ọ bụla a na-akpọtụrụ iji gbochie ya ka ọ bụrụ ihe na-akụda ya n'ọrụ site na ịkụ ịgbado ọkụ. Isi ihe nkedo a na-etinye ọkụ ọkụ ọkụ eletrik nke na-eme ka ọrụ ahụ dị ọkụ na okpomọkụ a chọrọ, Fig. 1 B. A na-eme welds niile na njem njem na-agbapụ 10 ipm, eurrent nke ihe dịka 350 amp na voltaji nke 10 ruo 15 v. .
Gas Tungsten-Ac Braze Welding
A na-emepụta gas tungsten-bụ braze weld na ehamber nwere ikuku ikuku site na usoro ndị yiri ya.

ndị ahụ akọwara n'elu. A na-eji aka mee ihe mkpuchi mkpuchi bead-onplate nke ejiri tungsten na W-26% Re filler metal; Otú ọ dị, a na-agbakọta eriri braze butt na-akpaghị aka mgbe etinyechara ígwè ndochi ahụ na nkwonkwo ụkwụ.
Electron Beam Welding
Emere eriri eleetron n'ime igwe 150-kV 20mA. A na-echekwa oghere nke ihe dịka 5 x I o-6 torr n'oge ịgbado ọkụ. Ịgbado ọkụ eletrik na-ebute oke dị elu nke omimi na obosara yana mpaghara dị warara nke okpomọkụ metụtara.
』 oning by Chemical Vapor Disposition
A na-eme nkwonkwo Tungsten site na ịtinye metal tungsten na-adịghị edozi ya site na usoro ntinye mmiri kemịkalụ3. A na-echekwa Tungsten site na mbelata hydrogen nke tungsten hexafluoride dị ka mmeghachi omume-t si dị
ikpo ọkụ
WFs(g) + 3H, (g)一–+W(s) + 6HF(g).
Iji usoro a maka ijikọ chọrọ naanị obere mgbanwe na nrụnye na nkesa reactant. Isi uru nke usoro a karịa ụzọ ndị ọzọ nke ịbanye bụ na, ebe ọ bụ na okpomọkụ dị ala na-arụ ọrụ (510 ruo 650 ° C) dị ala karịa ebe mgbaze.

tungsten (3410 Celsius C), recrystallization na enwere ike ime ka smbrittlement nke tungsten base metal arụpụtara site na adịghị ọcha ma ọ bụ uto ọka na-ebelata.
Akpụpụtara ọtụtụ atụmatụ nkwonkwo gụnyere mkpọchi butt na tube-end. A na-eme nkwụnye ego site n'enyemaka nke ọla kọpa nke e ji mee ihe dị ka ihe nrụnye, mpempe nkwụnye na mkpụrụ. Ka emechara ihe nkwụnye ego, ewepụrụ mandrel eopper site na etching. Ebe ọ bụ na ọrụ ndị ọzọ” egosila na CVD tungsten nwere nrụgide fọdụrụnụ dị mgbagwoju anya dị ka etinyere ya, nkwonkwo ndị a bụ nrụgide relicvcd I hr na 1000 Celsius ruo 1600 Celsius C tupu ịmegharị ma ọ bụ nnwale.
Nyocha na Nnwale
A na-enyocha nkwonkwo n'ọhụụ yana site na ntinye mmiri mmiri na redio tupu anwale ha. A na-enyocha kemịkalụ a na-ahụkarị maka ikuku oxygen na nitrogen (Table 2) na nyocha nke metallographic buru ibu n'ime ọmụmụ ihe niile.
N'ihi ịdị mfe dị n'ime ya na ime mgbanwe na obere ihe nlere anya, a na-eji ule bend eme ihe dị ka ihe bụ isi maka iguzosi ike n'ezi ihe nkwonkwo na nhụta nke usoro ahụ. Achọpụtara okpomọkụ mgbanwe nke ductile-tobrittle site na ngwa na-ehulata isi atọ maka nkwonkwo ma agbadoro ma mgbe ịkachara. Ihe nlere anya maka ule mgbagọ bụ ogologo ogologo

ihu ihu, 24t ogologo na 12t obosara, ebe t bụ ihe atụ ọkpụrụkpụ. A kwadoro ihe nlere anya n'ogologo 15t wee jiri mkpọda nke radius 4t gbadaa n'ogo 0.5 ipm. Jiometry a na-emezi ka data enwetara na ọkpụrụkpụ ihe dị iche iche. A na-ehutukarị ihe atụ na-atụgharị gaa na nkedo weld (specimen bend longitudinal) iji nye nrụrụ otu nke weld, mpaghara okpomọkụ emetụtara na metal ntọala; Otú ọ dị, a na-ehutu ụdịdị ole na ole n'akụkụ weld seam (transverse bend specimen) maka ntụnyere. A na-eji ihu ihu na akụkụ mbụ nke nyocha; Otú ọ dị, n'ihi ntakịrị ọkwa dị na faees nke ọtụtụ welds n'ihi ịdị arọ nke ígwè a wụrụ awụ, a na-edochi mgbanaka mgbọrọgwụ na ule ndị ọzọ. Ndụmọdụ ndị Board Advisory Board6 metụtara nleba anya nleba anya nke ụdị mpempe akwụkwọ gbasoro ya ka enwere ike. N'ihi ihe nwere oke, ahọpụtara ihe nlere anya kacha nta.
Iji chọpụta ọnọdụ okpomọkụ ngbanwe na-ehulata, a na-agbanye ngwa na-ehulata n'ime ọkụ nke nwere ike ime ka okpomọkụ dị ngwa ngwa ruo 500 Celsius C. A na-ahụta ụda nke 90 ruo 105 deg na-ehulata zuru ezu. A kọwapụtara DBTT dị ka okpomoku kacha dị ala ebe ihe nlele ahụ na-ehulata nke ọma na-enweghị mgbawa. Ọ bụ ezie na e mere ule ndị a na ikuku, ngbanwe nke ụdịdị ahụ apụtaghị ìhè ruo mgbe ule nyocha ruru 400 Celsius.

Onyonyo 1

Nsonaazụ maka Tungsten Unalloyed
Ọganihu Weldability
Gas Turzgstea-Arc ịgbado ọkụ-Na gas tungsten-arc ịgbado ọkụ nke 1 乍in. Mpempe akwụkwọ na-enweghị nke siri ike, ọrụ ahụ ga-eburịrịrịrị nke ọma ka ọ gbochie ọdịda na-akụjisị n'okpuru nrụgide nke ujo ọkụ na-ebute. Ọgụgụ 2 na-egosi mgbaji a na-ahụkarị site na ịgbado ọkụ na-enweghị ikpo ọkụ kwesịrị ekwesị. Ọnụ ọgụgụ buru ibu na ọdịdị nke weld na mpaghara okpomọkụ emetụtara pụtara ìhè na mgbaji. Nnyocha e mere ternperatures na-ekpo ọkụ site na ọnụ ụlọ ruo 540C gosiri na ikpo ọkụ ruo opekempe 150 Celsius dị mkpa maka imepụta welds butt otu ngafe na-enweghị mgbawa. Ọnọdụ okpomọkụ a dabara na DBTI nke metal base. Ịkpọ ọkụ na okpomọkụ dị elu egosighi na ọ dị mkpa na ule ndị a mana ihe nwere DBTI dị elu, ma ọ bụ nhazi nke na-agụnye oke nrụgide nrụgide ma ọ bụ akụkụ buru ibu karị, nwere ike ịchọ ikpo ọkụ ruo elu ternperatures.
Ogo nke welded na-adabere nke ukwuu n'usoro eji emepụta ọla ndị dị ala. Akpụkpọ anụ akpaaka na tungsten arc-cast na-enwere onwe ya pụọ ​​​​na porosity, Fig.
3A, ma welds na ntụ ntụ metallurgy tungsten ji nnukwu porosity, Fig. 3 (b), karịsịa n'akụkụ eriri njikọ. Ọnụ ego nke porosity a, Fig. 3B, karịsịa tinyere 3C, na welds mere na ihe onwunwe, obere porosity ngwaahịa (GE-15 nke General Electric Co., Cleveland mepụtara).
Gas tungsten-arc welds na CVD tungsten nwere mpaghara okpomọkụ na-adịghị ahụkebe n'ihi nhazi ọka 0 £ metaF isi. Ọgụgụ 4 na-egosi ihu na akụkụ obe kwekọrọ nke gas tungsten-arc butt weld dị otú ahụ. Rịba ama na ọka dị mma n'elu mkpụrụ osisi etoola n'ihi okpomọkụ nke ịgbado ọkụ. Ihe ọzọ pụtara ìhè bụ enweghị uto nke nnukwu columnar

ọka. Mkpụrụ osisi kọlụm nwere gas
bubb_les na oke ọka nke fluorme adịghị ọcha kpatara8. N'ihi ya, ọ bụrụ
ezi ọka mkpụrụ n'elu na-ewepụ tupu ịgbado ọkụ, weldment enweghị a metallographically chọpụtara okpomọkụ-emetụta mpaghara. N'ezie, na ọrụ CVD ihe (dị ka extruded ma ọ bụ dọtara tubing) okpomọkụ-emetụta mpaghara weld nwere nkịtị recrystallized ọka Ọdịdị.
Ahụrụ mgbawa na oke ọka columnar na RAZ nke ọtụtụ welds na CVD tungsten. Ihe mgbawa a, nke egosiri na Fig 5, kpatara site na nhazi ngwa ngwa na uto nke afụ na oke ọka na hightemperatures9. N'ebe okpomọkụ dị elu na-etinye aka na ịgbado ọkụ, afụ ahụ nwere ike iri ọtụtụ n'ime oke oke ọka; nke a, jikọtara ya na nrụgide a na-emepụta n'oge oyi, wepụrụ ókè ọka ndị ahụ iji mepụta mgbawa. Nnyocha e mere na-emepụta afụ na tungsten na ihe nkwụnye ígwè ndị ọzọ n'oge ọgwụgwọ okpomọkụ na-egosi na afụ na-apụta na ọla edobere n'okpuru 0.3 Tm (okpomọkụ na-agbaze homologous). Nlebanya a na-egosi na afụ gas na-etolite site na nchikota nke ohere ohere na gas ndị tọrọ atọ n'oge annealing. N'ihe banyere CVD tungsten, gas nwere ike ịbụ fluorine ma ọ bụ ngwakọta fluoride
Electron Beam Welding—Unalloyed tungsten bụ eletrọn doo ọkụ welded na na-enweghị preheating. Mkpa preheat dị iche iche na ụdị. Iji hụ na weld enweghị mgbawa, a na-atụ aro ikpo ọkụ ma ọ dịkarịa ala na DBTT nke metal ala. Electron beam welds na ngwaahịa metallurgy ntụ ntụ nwekwara weld porosity nke a kpọtụrụ aha na mbụ.

Gas Tungsten-Arc Braze Welding 一Na mbọ iji chọpụta ma enwere ike iji ịgbado ọkụ braze mee ihe, anyị nwalere usoro gas tungstenarc maka ịme welds braze na mpempe akwụkwọ metallurgy tungsten. butt nkwonkwo tupu ịgbado ọkụ. Ejiri Nb, Ta, Mo, Re, na W-26% Re na-enweghị alloed welds dị ka ọla na-ejuputa. Dị ka a tụrụ anya, e nwere porosity na fusion akara na metallographic ngalaba nke niile nkwonkwo (Fig. 6) ebe ọ bụ na isi ọla bụ powder metallurgy ngwaahịa. Welds ndị e ji niobium na ọla molybdenum emeju gbawara.
Atụnyere ike nke welds na braze weld site na nyocha nke welds bead-on-plated weld nke nwere tungsten na-adịghị mma na W一26% Re dị ka ọla ndị na-ejuputa. A na-eji aka mee akwa tungstenac gas na welds braze na ngwaahịa metallurgy tungsten ntụ ntụ (obere porosity, GE-15) ọkwa yana ọkwa azụmahịa nkịtị. Welds na braze weld n'ihe ọ bụla mere agadi na 900, 1200, 1600 na 2000 Celsius maka l, 10, 100 na 1000 hr. A na-enyocha ihe nlere ahụ na metaallographically, na ụzọ siri ike gafere weld, mpaghara okpomọkụ emetụtara, na metal ntọala ma dị ka-welded na mgbe ọgwụgwọ okpomọkụ gasịrị.

Tebụl 2

Onyonyo2

Ebe ọ bụ na ihe ndị e ji mee ihe n'ọmụmụ ihe a bụ ngwaahịa metallurgy ntụ ntụ, ọnụ ọgụgụ dị iche iche nke porosity dị na weld na braze weld nkwụnye ego. Ọzọ, nkwonkwo e ji ahụkarị ntụ ntụ metallurgy tungsten base metal nwere porosity karịa nke ejiri obere porosity mere, tungsten nwe ya. Ngwongwo braze emere na W-26% Re filler metal nwere obere porosity karịa weld nke ejiri igwe na-ejuputa tungsten na-enweghị ihe eji eme ya.
Achọpụtaghị mmetụta nke oge ma ọ bụ ọnọdụ okpomọkụ na isi ike nke welds ndị a na-eji tungsten na-enweghị ihe ọ bụla eme ihe dị ka metal filler. Dị ka welded, esiri ike nke weld na ala ọla bụ n'ezie na-adịgide adịgide na-adịghị agbanwe agbanwe mgbe nká. Agbanyeghị, welds braze nke ejiri W-26% Re filler metal siri ike karịa ka emepụtara karịa metal ntọala (Fig 7). Ma eleghị anya, isi ike dị elu nke nkwụnye ego W-Re br立e weld bụ n'ihi ngwọta siri ike na-agbasi ike na / ma ọ bụ ọnụnọ er na-ekesa nke ọma na nhazi siri ike. Ihe eserese nke tungstenrhenium nke 11 na-egosi na mpaghara mpaghara nke ọdịnaya rhenium dị elu nwere ike ime n'oge oyi na-adị ngwa ngwa ma mee ka e guzobe akụkụ siri ike, nke na-agbaji agbawa n'ime akụkụ dịpụrụ adịpụ nke ukwuu. Enwere ike ịgbasa usoro er nke ọma na oke ọka ma ọ bụ oke ọka, n'agbanyeghị na ọ nweghị nke buru oke ibu nke a ga-amata site na nyocha metallographic ma ọ bụ ntụgharị X-ray.
A na-akpa nkata ike siri ike dịka ọrụ dị anya site na ahịrị etiti braze-weld maka okpomọkụ dị iche iche ịka nká na Fig. 7A. Rịba ama mgbanwe na mberede

na hardness na fusion akara. N'ịbawanye okpomọkụ nke ịka nká, isi ike nke weld braze na-ebelata ruo mgbe 100 hr na J 600 ° C, ike siri ike bụ otu ihe ahụ nke tungsten base metal na-adịghị ahụkebe. Usoro a nke ibelata isi ike na oke okpomọkụ na-adị n'ezie maka oge niile ịka nká. Ịbawanye oge na okpomọkụ na-adịgide adịgide mekwara ka simiJar belata na ike siri ike, dịka egosiri maka ogo ịka nká nke 1200 ° C na Fig. 7B.
Isonye site na Mkpokọta Uzuzu Uzuzu—A nyochara ijikọ tungsten site na usoro CVD dị ka usoro maka imepụta weld n'ụdị ụdị dị iche iche. Site n'iji ihe nrụnye na ihe mkpuchi kwesịrị ekwesị na-amachi ntinye na mpaghara achọrọ, CVD na ntụ ntụ metallurgy tungsten ejikọtawo ma mechie njedebe na tubing. Ndobe n'ime bevel nke nwere akụkụ gụnyere ihe dịka 90 deg na-emepụta mgbawa, Fig. 8A, na nkwụsị nke mkpụrụ osisi columnar na-eto site n'otu ihu nke bevel na mkpụrụ (nke etched). Otú ọ dị, a na-enweta nkwonkwo dị elu na-eguzosi ike n'ezi ihe na-enweghị mgbawa ma ọ bụ nnukwu nrụpụta nke adịghị ọcha, Fig. 8B, mgbe a gbanwere nhazi nkwonkwo site na-egweri ihu nke isi metal na radius nke 飞in. tangent na mgbọrọgwụ nke weld. Iji gosipụta ngwa ngwa nke usoro a n'ichepụta ihe mmanụ ọkụ, a na-emechi njedebe ole na ole na tubes tungsten. Ihe nkwonkwo ndị a na-agbajikwaghị mgbe ejiri helium mass spectrorr:eter leak detector nwalere.

Onyonyo 3

Onyonyo 4

Onyonyo 5

Ihe eji arụ ọrụ
Ekpebiri Nnwale Nleba nke Fusion Welds 一Ekpebiri akụkụ ntụgharị nke na-agbaji agbagọ maka nkwonkwo dị iche iche na tungsten na-adịghị mma. The curves na fig. 9 na-egosi na DBTT nke abụọ ntụ ntụ metallurgy isi ọla bụ banyere m 50 ° C. A, na DBTT (nke kasị ala okpomọkụ na nke a 90 ka 105 deg ehulata nwere ike mere) nke abụọ ihe mụbara nke ukwuu mgbe ịgbado ọkụ. . Okpomọkụ mgbanwe ahụ mụbara ihe dị ka 175°C ruo uru nke 325°C maka ụdị ntụ ntụ metallurgy tungsten ma mụbaa ihe dị ka 235°C ruo uru nke 385°C maka obere porosity, ihe onwunwe. Ọdịiche dị na DBTT nke welded na ihe a na-ejighị n'aka bụ nke a na-ekwu na nnukwu ọka na ikesagharị adịghị ọcha nke welds na mpaghara okpomọkụ metụtara. Nsonaazụ ule na-egosi na DBTT nke ụdị ntụ ntụ metallurgy tungsten weld dị ala karịa nke ihe onwunwe, n'agbanyeghị na nke ikpeazụ nwere obere porosity. DBTT dị elu nke weld na tungsten porosity dị ala nwere ike ịbụ n'ihi nha ọka ya dị ntakịrị karịa, Fig. 3A na 3C.
A chịkọtara nsonaazụ nke nyocha iji chọpụta DBTT maka ọtụtụ nkwonkwo na tungsten na-adịghị ahụkebe na tebụl 3. Nnwale ihu na-enwe mmetụta nke ukwuu maka mgbanwe na usoro nyocha. Mgbagwoju mgbọrọgwụ pụtara ka ọ bụ ductile karịa agbagọ ihu. Ihe enyemaka nrụgide ahọpụtara nke ọma mgbe ịgbado ọkụ gachara pụtara wedata DBTT nke ukwuu. CVD tungsten nwere, dị ka welded, DBTT kasị elu (560℃)  ma mgbe e nyere ya 1 hr nrụgide enyemaka nke 1000 ℃ mgbe ịgbado ọkụ, DBTT ya gbadara na 350 ℃. enyemaka nrụgide nke 1000 ° C mgbe ịgbado ọkụ, DBTT ya gbadara na 350 ° C. Nchegbu nke arc welded powder metallurgy tungsten maka 1 hr na 18000 C belatara DBTT nke ihe a site n'ihe dịka 100 ° C site na uru e kpebiri maka ya dị ka- welded. Ihe mgbakasị ahụ nke 1 hr na 1000 ° C na nkwonkwo nke usoro CVD mere na-emepụta DBTT kacha ala (200 ° C). Ekwesiri iburu n'uche na, ebe ntụgharị ntụgharị a dị ntakịrị ala karịa mgbanwe mgbanwe ọ bụla a na-ekpebi n'ọmụmụ ihe a, ọ ga-abụrịrị na ọ na-emetụta ọganihu ahụ site na ọnụ ọgụgụ dị ala (0.1 vs 0.5 ipm) ejiri mee ule na nkwonkwo CVD.

Bend Test of braze welds-gas tungsten-arc braze welds mere na Nb. Ta, Mo, Re, na W-26% Re ka a na-ehukwa ọla ndị na-ejuputa ma na-ehulata nsonaazụ ya na tebụl 4. A na-enweta ihe kachasị ductility site na weld braze rhenium.

Ọ bụ ezie na nsonaazụ nke ọmụmụ cursory a na-egosi na igwe na-ejupụta ụdị ahụ nwere ike mepụta nkwonkwo nwere akụrụngwa arụrụ arụ n'ime ọtụtụ welds na tungsten, ụfọdụ n'ime ọla ndị a nwere ike ịba uru na omume.

Nsonaazụ maka Tungsten Alloys.