Abubuwan Tungsten Metal Powder

Ayyukan tungsten foda yana da tasiri mai mahimmanci akan aikin sarrafawa da ingancin samfurori na gaba. Sabili da haka, duka filin gami mai ƙarfi da filin sarrafa kayan tungsten sun gabatar da buƙatu masu dacewa don tsabtar sinadarai da kaddarorin jiki na raw tungsten foda, musamman ma buƙatun kayan kaddarorin jiki suna ƙaruwa da girma. 

Tsaftar sinadarai

Lokacin ƙera siminti carbide da samfuran tungsten, ana buƙatar tsaftar sinadarai na tungsten foda ya zama mai girma. Abubuwan da suka rage na ƙazanta a cikin tungsten foda suna da tasiri akan aikin sarrafawa da aikin sabis na samfuran. Tasirin yana da rikitarwa sosai, wasu suna cutarwa wasu kuma suna da fa'ida. Bincike na yanzu ya nuna cewa Ca, Mg, P, As, Si, S, Fe, Ni, Cu, Al, da Mo na iya rage ƙarfin haɗin gwiwa, yayin da K da Na ke inganta haɓakar hatsin WC. V da Cr, a gefe guda, suna hana haɓakar hatsi. Idan abun ciki na Mo a cikin WO ya wuce 0.5%, zai haifar da raguwa a cikin ƙarfin juzu'i na gami. A yawancin nau'ikan foda na tungsten da ake samarwa a halin yanzu, abubuwan da ke cikin gurɓataccen ƙarfe na ƙarfe (ban da waɗanda aka ƙara a matsayin ƙari) yana cikin kewayon ƴan sassa cikin dubu goma zuwa ƴan sassa cikin dubu ɗari. 

Oxygen a cikin tungsten foda na iya amsawa tare da carbides, ɗaukar carbon daga carbide da haifar da decarburization na siminti carbide. Lokacin da alloy ɗin ya lalace sosai, lokaci na γ yana bayyana, yana yin gawa gagaɗi. Gas ɗin da aka saki daga abin da ya faru yana ƙaruwa da porosity na gami kuma yana rage ƙarfinsa. Dangane da matakai daban-daban na raguwa da kayan aiki, abun ciki na oxygen a cikin tungsten foda shine gaba ɗaya tsakanin 0.05% da 0.5%, kuma yana ƙaruwa tare da raguwa a cikin ƙananan ƙwayar tungsten foda da karuwa a wani yanki na musamman. Sabili da haka, abin da ake buƙata don abun ciki na oxygen a cikin tungsten foda mai kyau ya kamata a kwantar da hankali sosai. Ana nuna buƙatun tsabtace sinadarai don tungsten foda a cikin Table 4-1, kuma ana nuna buƙatun abun ciki na oxygen a cikin Tebur 4-2.

Abubuwan da ba su da tsabta a cikin tungsten foda na iya fitowa daga kayan albarkatun kasa ko kuma a gabatar da su yayin aikin samarwa. Sabili da haka, hana gurɓataccen kayan aiki a lokacin aikin yana da mahimmanci. Alal misali, a cikin samar da tungsten foda ta amfani da APT a matsayin albarkatun kasa, kayan sun zo cikin hulɗar kai tsaye tare da wutar lantarki, raguwar bututun wuta, da crucibles, wanda ya haifar da karuwa a cikin abubuwan da ba su da kyau kamar Fe, Ni, Cr, da Si, da kuma raguwa a cikin tsabtar sinadarai. Lokacin da abun cikin su ya kai wani matsayi ko kuma suka tara zuwa isasshe girma, za su iya zama tushen lahani don sarrafawa ko amfani na gaba. Sabili da haka, don tabbatar da tsabtar tungsten foda, ban da kula da ingancin kayan APT mai mahimmanci, yana da matukar muhimmanci don hana kamuwa da cuta yayin aiwatarwa. 

2. Abubuwan Jiki

The jiki Properties na karfe tungsten foda yafi hada da talakawan barbashi size, barbashi size rarraba, barbashi tara digiri, barbashi ilimin halittar jiki, takamaiman surface area, girma yawa, compacted yawa, da Hall ya kwarara kudi, da dai sauransu. 

(Matsakaicin girman barbashi da rarraba girman barbashi)

Ko yana da siminti carbide ko tungsten kayayyakin, akwai m bukatu ga matsakaicin barbashi size da barbashi size rarraba tungsten foda. A cikin filin cimented carbide, da barbashi size da barbashi size rarraba W foda kai tsaye shafi barbashi size da barbashi size rarraba na samar WC foda. Girman barbashi na WC foda yana ƙara rinjayar aikin samfuran carbide da aka yi da siminti. 

Binciken ya gano cewa kaddarorin WC foda an iyakance su ta hanyar W foda. Bayan W foda ne carbonized don samar da WC, da barbashi size jurewa kadan canji. Don samar da WC foda na m, matsakaici da lafiya barbashi masu girma dabam, m, matsakaici da lafiya barbashi W foda bukatar da za a yi amfani da. Uneven W foda carbonization sakamako a cikin m WC foda. Canje-canje a cikin girman ƙwayar foda bayan carbonization na m, matsakaici da lafiya barbashi W foda an nuna su a cikin Table 4-3.

Abubuwan buƙatun don girman ƙwayar tungsten foda sun bambanta tsakanin masu amfani daban-daban. Domin da wuya gami filin, ga daban-daban na wuya gami da aka yi amfani da daban-daban dalilai, saboda daban-daban barbashi masu girma dabam na WC foda amfani, akwai daban-daban bukatun ga talakawan barbashi size da barbashi size abun da ke ciki na raw kayan W foda. Duk kayan aikin yankan suna buƙatar W foda da WC foda don samun girman ƙwayar cuta mai kyau da kunkuntar girman girman rabo. Kayan aiki masu tasiri suna buƙatar W foda da WC foda su zama m, tare da rarraba girman barbashi. Matsakaicin girman barbashi da aka yi amfani da shi don shirya ƙwanƙwasa WC shine 25.8 μm. Ana nuna girman girman nau'in nau'in nau'in nau'i na W foda a cikin Hoto 4-1.

For tungsten material processing, the average particle size and particle size distribution of tungsten powder have an impact on the pressing performance of the subsequent products, the density of the green body (also known as the pressed body), and the sintering performance. Karami foda girman da ƙarin hadaddun siffofi zai haifar da mafi girma gogayya tsakanin barbashi, haifar da raguwa a cikin yawa na kore jiki. Da kunkuntar da barbashi size rarraba, da mafi loosely da barbashi an shirya. A fadi barbashi size rarraba, ko ma hadawa powders na daban-daban talakawan barbashi masu girma dabam, zai iya cimma mafi alhẽri barbashi tsari da samun mafi girma kore jiki ƙarfi. A cikin filin sarrafa kayan tungsten, matsakaicin girman ƙwayar tungsten foda ana buƙatar gabaɗaya don kasancewa cikin kewayon 2 zuwa 6 μm. 

Akwai hanyoyi da yawa don kayyade girman ƙwayar foda da girman rabo. Ana amfani da kayan aikin Fischers da na'urar tantance girman ƙwayar laser a cikin tungsten foda. Koyaya, saboda ka'idodi daban-daban na waɗannan hanyoyin aunawa guda biyu, ƙimar ƙimar da aka samu daga foda ɗaya na iya bambanta. Saboda haka, da barbashi size na tungsten foda kamata kullum a bayyana a matsayin Fischer 'matsakaicin barbashi size ko Laser matsakaita barbashi size. Bugu da ƙari, ya kamata a lura cewa "ƙaddamar da aka ba da ita" tungsten foda yawanci yana da digiri daban-daban na agglomeration, wanda ke da alaƙa da yanayin samarwa. Matsakaicin girman ƙwayar tungsten foda da aka auna ta amfani da irin waɗannan samfuran na iya bambanta da ainihin girman ƙwayar foda. Alal misali, da barbashi size wasu maras ban sha'awa lafiya tungsten foda a cikin "samar da jihar" ne 1-2 μm, da kuma bayan depolymerization da watsawa, da darajar saukad da zuwa 0.4-0.5 μm. Don tungsten foda tare da masu girma dabam a cikin kewayon 1-10 μm, a mafi yawan lokuta, aunawa "jihar da aka ba da ita" na iya saduwa da bukatun samarwa. Domin submicron tungsten foda da kuma coarser tungsten foda, domin mafi daidai fayyace girman da barbashi, "nika jihar" samfurori dole ne a yi amfani da matsakaita barbashi size da barbashi size gwaje-gwajen rarraba. 

Tya barbashi size rarraba tungsten foda yana da alaka da girman barbashi. Gabaɗaya, mafi girma matsakaicin matsakaicin girman ƙwayar tungsten foda, mafi girman rarraba girman barbashi. Domin da aka ba barbashi size, a samar, hanyoyin kamar yin amfani da rigar hydrogen ko ƙara alkali karfe mahadi zuwa tungsten oxide iya sa barbashi size ya fi girma da kuma sarrafa barbashi size kewayo mafi kunkuntar. Ƙayyadaddun girman rabon barbashi sau da yawa ana aiwatar da su ta amfani da samfuran "ƙasa". 

Matsakaicin girman ƙwayar tungsten foda ana bayyana shi ta hanyar diamita (a cikin micrometers). Koyaya, a aikin samarwa, ana yawan amfani da wasu ra'ayoyi masu ƙima. Rarraba gama-gari sun haɗa da: 

Matsakaicin ƙananan barbashi: Matsakaicin girman barbashi> 30 μm; 

30 μm; 

Matsakaicin barbashi: Matsakaicin girman barbashi 10 zuwa 30 μm; 

Matsakaicin matsakaici: Matsakaicin girman 3 zuwa 10 μm; 

Kyawawan barbashi: Matsakaicin girman barbashi 0.5 - 3 μm; 

Barbashi Ultrafine: matsakaicin girman barbashi

(2) Digiri na tara

A taro mataki na powders yawanci halin da bambanci a cikin barbashi size tsakanin "zuwa jihar" powders da "ƙasa jihar" powders. Matsakaicin tarawa mai kyau tungsten foda yana gabaɗaya sama da na ƙaƙƙarfan foda na tungsten. Don samar da kayan tungsten, digiri na tara kai tsaye yana rinjayar ƙarfin koren yanki. A cikin tsarin samar da WC, matakin tarawa na w foda yana da tasiri akan daidaituwar rarraba carbon. 

(3) Kwayoyin Halitta

Halin ilimin halittar jiki na tungsten foda yana da tasiri akan aikinta na latsawa da ƙarfin jikin kore. Kwayoyin halittar kwayoyin halitta marasa daidaituwa suna haifar da cudanya tsakanin barbashi, ta haka yana haɓaka ƙarfin koren jiki. Spherical tungsten foda yana da ruwa mai kyau kuma ya dace da kayan feshi musamman. Hakazalika, lokacin da ake shirya WC, ilimin halittar tungsten foda kuma yana rinjayar ilimin halittar jini na WC foda. 

(4) Takamaiman Wurin Sama

Jimillar sararin samaniya da ke da nau'i na nau'i na tungsten foda ana kiransa a matsayin yanki na musamman na tungsten foda, wanda yawanci ya bayyana a cikin raka'a na m2 · g-1. Ƙayyadadden yanki na tungsten foda yawanci jeri daga 0.01 zuwa 12 m2 · g-1. Yana nuna a kaikaice girman barbashi da ilimin halittar jiki na tungsten foda kuma yana da muhimmiyar alama don kimanta ayyukan sintering, halayen rushewa, da ikon amsawa tare da gaseous da abubuwa masu ƙarfi yayin aiwatar da carbonization na tungsten foda. 

(5) Sako da ɗimbin yawa

Ƙaƙƙarfan ƙarancin ƙima da ƙaƙƙarfan ƙwayar tungsten foda yana ƙaruwa tare da haɓaka matsakaicin girman ƙwayar foda. Dangantaka tsakanin sako-sako da yawa na tungsten foda samar da wani masana'anta da ta Fischer 'matsakaicin girman barbashi aka nuna a cikin Table 4-4. Da kunkuntar da barbashi size rarraba na foda, da mafi hadaddun da barbashi ilimin halittar jiki, da kuma mafi tsanani da aggregation, da karami da sako-sako da yawa. Gabaɗaya, ana iya daidaita sigogin tsari na tsarin ragewa don sarrafa shi.

(6) Ruwan ruwa

Rashin ruwa na tungsten foda yana tasiri ta hanyar girman barbashi, girman rabo, da ilimin halittar jiki. Matsakaicin ɓangarorin foda, da zagayawa ga barbashi, da mafi santsi, mafi kyawun ruwa. Yawan ruwa na tungsten foda yawanci ana auna shi ta hanyar adadin kwararar Hall, wanda aka bayyana a matsayin lokacin da ake ɗaukar 50g na foda tungsten don gudana ta cikin ƙayyadadden ƙaramin rami a cikin mita kwararar Hall. Ruwan foda kai tsaye yana rinjayar ɗora nauyi yayin aikin latsawa da daidaituwar yawan simintin simintin gyare-gyare. 

(7)Daidaitawa

Matsakaici yana nufin ikon tungsten foda da za a matsa a ƙarƙashin ƙayyadaddun yanayin latsawa. Yawancin lokaci ana auna shi a daidaitattun gyare-gyare a ƙarƙashin ƙayyadaddun yanayin lubrication, kuma ana bayyana shi ta yawan foda na samfurin da aka danna ƙarƙashin ƙayyadadden matsa lamba. Hakanan za'a iya wakilta shi da jadawali mai lanƙwasa yana nuna canjin yawan matsi na samfur tare da latsawa. 

(8) Tsari