Kedu ka esi eme Tungsten Carbide?

    A na-eji ngwaahịa Tungsten Carbide mee ihe n'ọtụtụ ngwa, gụnyere ngwaọrụ ịkpụ, mkpọpu ihe, ịkụ ọkpọ, na ọtụtụ ngwa ndị ọzọ. Cemented Carbide na-enye nguzogide iyi ka mma ma na-agbatị ndụ nke ụdị uwe na ịkpụ dị iche iche. N'ihi na akụkụ ya bụ isi bụ tungsten, nke bụ ihe na-adịghị ahụkebe na nke na-adịghị emezigharị, ọnụahịa nke carbide cimented dị oke elu. Tụkwasị na nke ahụ, carbide cemented nwere ihe siri ike dị elu, na ike na-ehulata dị nnọọ ala karịa nke ọla ndị ọzọ, dị ka ígwè. N'ihi ihe abụọ a, carbide cemented ga-ejikọta ya na ọla ndị ọzọ n'ụzọ dị iche iche, dị ka site na njikọ eri, clamping, na welding. Isiokwu a na-ekwu maka otu esi agbaze tungsten carbide na ọla ndị ọzọ.

1. Gịnị bụ tungsten carbide?

    Tungsten carbide (WC), nke a na-akpọkwa carbide cemented, bụ ihe mejupụtara ihe eji eme ya site na usoro a na-akpọ metallurgy ntụ ntụ. A na-agwakọta ntụ ntụ WC na igwe ihe nkedo, na-abụkarị cobalt ma ọ bụ nickel, na-ejikọta ya na ngwá ọrụ preform, wee gbanye ya n'ime ọkụ. Okwu ahụ bụ "cimented" na-ezo aka na akụkụ nke tungsten carbide nke a na-ejide n'ime ihe nkedo ọla na "cemented" ọnụ, na-eme njikọ nke metallurgical n'etiti tungsten carbide particles na ihe nkedo (WC-Co), na nhazi usoro. Ụlọ ọrụ carbide cimented na-ezokarị aka na ihe a dị ka nanị "carbide", ọ bụ ezie na a na-eji okwu tungsten carbide na carbide cimented mee ihe n'otu n'otu.  Carbide na-egosipụta ike mkpakọ dị elu, na-eguzogide mgbagha, ma na-ejigide ụkpụrụ ike ya na okpomọkụ dị elu, ihe anụ ahụ bara uru karịsịa na ngwa ịkpụ ígwè. 

2 . Isi ihe abụọ iji hụ na ịga nke ọma na brazing tungsten carbide

A. Ijikwa nrụgide dị iche iche na-akpata

B. Ọnụ ego nkwekọrịta nke ihe nne na nna na wetting nke carbide site na braze alloy

    N'oge kpo oku na oyi, metal ndị nne na nna ga-agbasawanye na nkwekọrịta n'ogo dị elu karịa carbide.  Tungsten carbide nwere ọnụego mgbasawanye ọkụ nke ihe dịka 1/3 ruo 1/2 nke ígwè.  Mgbe mgbakọ brazed jụrụ oyi, nchekasị fọdụrụnụ nwere ike ịmalite n'ime carbide.  A na-atụ aro ime ka carbide dị nwayọ nwayọ nwayọ mgbe niile iji zere nrụgide na mgbawa enwere ike. A naghị atụ aro ka ọ kwụsịtụ n'ihi na ọ nwere ike ime ka ọkpụkpụ na carbides n'ihi nkwụsị ngwa ngwa nke nne na nna ntọala metal.

3. Otu esi ahọrọ braze alloy

    Tungsten carbide siri ike mmiri. A na-ejikarị ọla edo braze alloys nwere obere mgbakwunye nke nickel (Ni) na-agbaze carbide na nchara. N'ezie, ma carbide na ígwè ga-adị ọcha ka braze alloy a wụrụ awụ nwere ike ime ka ebe ndị ahụ na-emekọ ihe na-agba mmiri kpamkpam. Na-egweri elu carbide iji mepụta elu dị ọcha maka brazing dị mkpa. Egweri nwekwara uru nke ịgbatị elu topography nke carbide, nke nwere ike inye aka na braze alloy wetting na adhesion. Ihe ndị mejupụtara ígwè, n'otu aka ahụ, ga-adị mkpa ka ihicha ya iji wepụ ihe ọ bụla griiz, mmanụ, unyi, ma ọ bụ ihe ndị ọzọ na-emerụ emerụ n'elu.  

    Alloys braze ọlaọcha dị n'ahịa yana obere mgbakwunye nke nickel (Ni) na Manganese (Mn) ga-adị mmiri ngwa ngwa n'elu cemented carbide. Alloys braze ndị a na-egosipụtakarị mmiri mmiri nke tungsten carbide.  A na-atụ aro ka ịhọrọ metal brazing filler nwere okpomọkụ brazing kacha dị ala iji belata nrụgide fọdụrụ n'ime nkwonkwo.  

Maka ngwacations ndị metụtara brazing nke nnukwu carbides, a na-ejikarị ihe eji eme ihe na-eme ka Sanwichi braze alloy.  Ọ bụrụ na enweghị ike iji obere carbides (1/2 inch2) mee ihe, Sanwichi alloy bara uru n'igbochi mgbawa na warpage nke carbide. A na-ekpuchi trimetal ndị a na ihe ndochi braze jikọtara n'akụkụ abụọ nke isi ọla kọpa.  

    Ọ bụ ezie na ọtụtụ n'ime mkparịta ụka ahụ anọwo na brazing nke tungsten carbide (WC), anyị ga-enwe nsogbu ma ọ bụrụ na anyị ekwughị okwute diamond polycrystalline ma ọ bụ PCD. A na-edobe okpomoku brazing maka PCD n'okpuru 1382°F (750 Celsius) iji zere mmebi nke diamond.  Ọtụtụ mgbe, ndị na-emepụta ndụmọdụ PCD maka ahụ nchara ga-eji metal braze na-ekpo ọkụ dị ala, dị elu dị ka BAg-24 braze alloy.  Ụfọdụ ndị na-emepụta ihe na-eji braze alloy na-enweghị nickel ma ọ bụ manganese, dị ka BAg-5 ma ọ bụ BAg-7 braze alloy, na ala gbazee okpomọkụ na obere wetting Njirimara nke carbide na ígwè.

    A na-eji ntụgharị brazing eme ihe iji gbochie oxidation nke elu ndị a ga-ejikọta n'oge ikpo ọkụ nke mgbakọ ahụ.  A na-eji ntụ ntụ eme ihe na-eji ọla ọcha braze alloys nkịtị.  Ndị na-emepụta braze na flux na-akwadokarị ntụ ntụ ojii dịka ọ nwere mgbakwunye boron ma na-arụ ọrụ nke ọma na okpomọkụ dị elu.

    Enwere ọtụtụ brazing alloys eji maka carbide. Omuma bụ BAG-3, 50% ọlaọcha na Cadmium.  Nke a bụ ngwaahịa mara mma, mana ọ nwere Cadmium. A na-ejikarị eme ihe bụ BAG-7, ọlaọcha 56 na Tin, n'ihi na ọ na-agbapụta ngwa ngwa; Otú ọ dị, ọ bụ ihe na-adịghị ike brazing alloy, na nkwonkwo ọdịda na-adịkarị na nke a alloy. Ihe kachasi ike na-abụghị Cadmium alloy bụ BAG-22, ọla ọcha 49% nwere manganese, mana ọ bụ ntakịrị gummy na eruba. BAG-24, 50% Silver, enweghị cadmium ma bụrụ nkwekọrịta.  Ọ na-asọ nke ọma mana ọ dị ihe dịka 40% adịghị ike karịa BAG-3 na BAG-22.

    Anyị na-ahọrọ Black Flux nke ukwuu, n'agbanyeghị na ọtụtụ na-eji White Flux na-eme nke ọma. N'ọnọdụ abụọ a, ha bụ n'ụzọ doro anya na elu okpomọkụ fluxes. Na mgbakwunye, anyị na-ahụ na Black Flux dị ọcha na-enye mgbaba dị mma na nkwonkwo siri ike karịa Black Flux nkịtị.  

    Ebe ikpeazụ ebe mmejọ na-emekarị bụ na nhazi nkwonkwo. Ndị a zụrụ azụ welder na-achọkarị ịchịkọta akụkụ ahụ wee were cha cha. Mgbe ha na-agbaze, ha na-achọ ikpokọta akụkụ ahụ wee kpoo alloy brazing n'ime nkwonkwo.   

    Mgbe ị na-eme brazing carbide, ọ na-adịkarị irè karị ịgbanye akụkụ na ala nke notch, wee tinye iberibe waya alloy fluxed n'okpuru carbide.  Ihe niile ị na-eme bụ ikpo ọkụ ruo mgbe carbide dabara n'ebe.   

    Ụkpụrụ kwesịrị ịbụ na carbide ruptures ma ọ bụ nchara nchara tupu nkwonkwo ada ada.