I-Sintering yokusebenza kwefekthri ye-powder metallurgy akusona isinyathelo sokugcina—isikhathi sokwenza noma sokuphumula sengxenye yobuqotho, ukuzinza kobukhulu, nokusebenza kwesikhathi eside ezinhlelweni ezicindezela kakhulu. Kwa-QINGDAO QIANGSENYUAN TECHNOLOGY CO., LTD., sesifake amaqoqo angaphezu kuka-12,000 we-cobalt-nickel alloy compacts kusukela ngo-2018—ikakhulukazi i-AMS 5387 kanye ne-T800-grade materials ezihloselwe izindlu zamaphampu asebenza ngogesi, izihlalo zamavalvu ocindezelwayo, izihlalo zamavalve omshini wokuwina. Esikufundile kwakungekho ezincwadini zokufunda. Ivele ezingodweni zomlilo, ama-microstructure scan, kanye nokuhlaziywa kwembangela okuphindaphindiwe lapho ukuminyana kwehle ngo-0.3% ku-1,185°C noma ukukhula okusanhlamvu kwanda ngesikhathi sokupholisa okuhlanjululwe yi-nitrogen.
Ukulawulwa Kwephrofayela Yezinga lokushisa Akuxoxiswana—Ikakhulukazi kumaSuperalloys
Ukwehluleka okuningi ekufakweni kwemigqa yemboni ye-powder metallurgy kubuyela emuva ku-thermal lag-hhayi imikhawulo yemishini. Ukuchezuka okungu-15°C ngesikhathi sokubamba okuphezulu kushintsha ukusabalalisa kwesigaba se-AMS 5387 se-intergranular ngokwanele ukunqamula impilo yokukhathala ngo-37% ezindlini zamasilinda wephampu ye-piston. Sisebenzisa iziko elishisayo le-molybdenum ene-dual-zone enempendulo yesikhathi sangempela se-thermocouple ezindaweni ezintathu zeradial ngomthwalo ngamunye. Ukuqonda okubalulekile: amazinga erempu angaphansi kuka-3°C/min ngaphansi kuka-600°C avimbela ukuqhunyiswa kokubola kwe-binder; ngaphezu kwe-900 ° C, sibamba imizuzu engu-45-hhayi i-60-ukugwema ukusabalalisa kwe-cobalt ngokweqile ngenkathi sigcina ≥98.2% ukuminyana kwethiyori. Lokhu akuwona umbono. Iphrofayili edlulise ukuqinisekiswa okuqinile kwe-ASTM B243 ezindaweni ezingama-92 ezilandelanayo.
I-Atmosphere Purity Iqondisa Ngokuqondile Ubuqotho Bendawo-kanye Nokusebenza
Okuqukethwe kwe-hydrogen kubaluleke ngaphezu kokugeleza kwegesi okuphelele. Siqapha indawo ye-H₂ ngokuqhubekayo—hhayi nje ukugxilisana kwe-inlet. Imibhobho ye-cobalt alloy yekhasimende elilodwa ibonise i-micro-pitting ngemva kokwelashwa kokushisa. Uphenyo lwembule i-inlet hydrogen ekuhlanzekeni okungu-99.99%—kodwa indawo yamazolo ku--42°C yethule umhwamuko wamanzi olandelanayo owafaka imingcele yokusanhlamvu okunothe nge-nickel ngesikhathi sokushiswa. Isixazululo: kwengeza ukucupha kwe-cryogenic futhi kuqiniswe amazolo afike ku-65°C. Umphumela: ukuhwaqazeka kwendawo (Ra) kwehle kusuka ku-1.8 µm kuya ku-0.6 µm pre-machining, yehlisa isikhathi somjikelezo we-CNC ngo-22%. Ngokusakazwa kwensimbi nezinto zensimbi engagqwali, sishintshela ku-ammonia engahlangani nayo <5 ppm O₂—iqinisekiswa njalo ngehora kusetshenziswa inzwa ye-zirconia. Akukho okuhlukile.
Layisha Ijometri kanye Nokuminyana Okuhlaza Kufanele Kufaniswe—Kungakhuliswa
Ukuminyana okuphezulu okuluhlaza kuzwakala kangcono—kuze kube yilapho kutholakala ukuhlanekezela. Sibeka ukuminyana okuluhlaza ku-62–65% ezingxenyeni ezisekelwe ku-T800 ezinde kuno-120 mm. Kungani? Ngenxa yokuthi ukushwabana okungalingani kumakhonsathi ayinkimbinkimbi—njengalawo asemiphini yewintshi yemoto yobunjiniyela—kudala ukukhothama okungu-0.18 mm ngobude obungu-300 mm uma ukuminyana okuluhlaza kudlula u-66%. Ukulungisa kwethu: amathreyi okulayisha ahlukaniswe ngezigaba anamaphini okusekela asezingeni. Izingxenye ezizacile zihlala phezu kwezitendi ze-ceramic ezikwazi ukumelana kancane; izisekelo eziwugqinsi zihlala kumaphedi e-silicon carbide ane-conductivity ephezulu. Ukwehluka kokuncipha kwehle kusuka ku-±0.32% kuya ku-±0.07%. Ibhonasi: Ukukhishwa kwesithando somlilo kukhuphuke ngo-18% ngoba sisuse ukulungiswa kwe-post-sinter.
Ukuqapha Kwesikhathi Sangempela Kwedlula Ukuhlolwa Kwangemva Kwenqubo Njalo
Siyekile ukuthembela ekuhloleni ukuminyana okususelwe kumasampula ngemva kokuba inqwaba yemizimba yamavalvu okucindezela ihlulekile ukuhlolwa kwe-hydrostatic kubha engu-410—naphezu kokudlula ukuhlolwa kwe-CMM. Imbangela: i-porosity eyenziwe yasendaweni eduze ne-radii yangaphakathi ephuthelwe ukulinganisa kwephoyinti elilodwa le-Archimedes. Manje yonke i-sintering run idla idatha kusistimu yethu ye-SinterTrack yokuphathelene: ama-thermocouple arrays log 120 amaphuzu ngomthwalo ngamunye; izinzwa zokulahlekelwa okukhulu zibona ukuqeda ukutubeka kwe-binder phakathi nemizuzwana engu-±0.8; Imephu ye-infrared imephu yokushintsha kokukhipha umoya okukhombisa ukuhlangana kokusanhlamvu kwangaphambi kwesikhathi. Izaziso zicupha ukubamba nokubuyekeza okuzenzakalelayo uma noma iyiphi ipharamitha ichezuka ngaphezu kwemikhawulo yokulawula eqinisekiswe ngokwezibalo—ibalwa ngokwebanga lezinto ezibonakalayo, hhayi ngesithando somlilo ngasinye. Lokhu kwehlisa inkatho engahambisani nemithetho isuka ku-1.4% yaya ku-0.23% ezinyangeni eziyi-18.
Ukuthuthukisa Akukhona Ngepharamitha Eyodwa-Kumayelana Nezinqumo Ezihlanganisayo
Ukuphumelela kwemboni ye-powder metallurgy kuncike ekutheni umkhathi, izinga lokushisa, isikhathi, nengxenye yejiyomethri kusebenzisana kanjani—hhayi ukuthi ngayinye isebenza kanjani iyodwa. Izinga lokushisa eliphakeme elingu-5°C lithuthukisa ukuminyana kodwa lenza i-oxidation yendawo ibe yimbi ngaphandle uma ubumsulwa be-hydrogen buqina kanyekanye. Ukupholisa okusheshayo kuthuthukisa ubulukhuni kodwa kumema ama-microcracks ngaphandle uma ukuminyana okuluhlaza kwehla kancane. Kwa-QINGDAO QIANGSENYUAN, siphatha i-sintering njengesistimu ye-loop evaliwe: idatha ye-powder lot engenayo (usayizi wezinhlayiyana D50, okuqukethwe komoya-mpilo, izinga lokugeleza) ilungisa ngokuqondile izindawo zokubeka isithando somlilo ngaphambi kokulayisha. Sabelana ngalo mqondo—hhayi nje imiphumela—namakhasimende ngesikhathi sokubuyekezwa kwe-GD&T. Ngoba lapho indlu yakho yephampu kufanele isinde emijikelezweni engu-20,000 kubha engu-350, ukufakwa kwe-sinter akwenziwa. Ukugcwaliseka kwenkontileka ye-metallurgical.
