Taw qhia rau sintering txheej txheem kev paub hauv hlau txhaj tshuaj molding (MIM)

Hlau txhaj tshuaj molding (MIM) yog siv cov txheej txheem ntawm cov hlau los yog alloy qhov chaw los tsim thiab sinter hlau hmoov (los yog hlau hmoov thiab tsis yog xim hlau sib xyaw hmoov). Cov txheej txheem tuaj yeem siv los ua kom ncaj ncaj ntxeem tau ntxeem tau, cov ntaub ntawv tuab thiab cov khoom lag luam thiab cov khoom siv dav dav.

Lub sintering cua ntawm cov hlau txhaj tshuaj molded cov khoom yog ib qho tseem ceeb ntawm kev cuam tshuam cov khoom ntawm hlau txhaj tshuaj molded khoom. Hmoov sintering cua yog hais txog qhov chaw tiag tiag hauv sintering rauv thaum hlau txhaj tshuaj molding khoom yog sintered. Cov cua sintering feem ntau suav nrog kev tiv thaiv huab cua, tswj huab cua thiab huab cua huab cua. Zhongwei Precision caw peb los saib:

Kev tiv thaiv huab cua: huab cua tiv thaiv tau muab faib ua kom txo qis huab cua thiab huab cua nruab nrab, thiab txo cov huab cua yog muab faib ua hydrogen thiab ammonia decomposition. Lub luag haujlwm tseem ceeb ntawm kev tiv thaiv huab cua yog tiv thaiv oxidation ntawm sintering khoom thaum sintering.

Hydrogen muaj zog permeability ntawm qhov kub thiab txias. Cov roj yog chemically active, flammable thiab non-toxic. Nws yog feem ntau siv rau sintering tiv thaiv huab cua ntawm refractory hlau txhaj tshuaj molding khoom xws li tungsten, hard alloy thiab stainless hlau.

Ammonia decomposition yog thermal decomposition ntawm kua ammonia los ntawm hydrogen thiab nitrogen. Thaum lub sij hawm hlau txhaj tshuaj molding, cov roj sib xyaw tuaj yeem siv los ua tus neeg sawv cev txo qis, thiab tseem tuaj yeem siv los ua qhov chaw sintering ntxiv rau qee cov khoom uas muaj cov khoom siv nitrogen. Txij li cov tshuaj tiv thaiv ntawm cov cua tsim tsis tuaj yeem siv rau sintering, feem ntau cov hlau tuaj yeem siv los ua sintering cua.

Neutralization huab cua: Neutralization cua feem ntau suav nrog nitrogen, ammonia thiab lub tshuab nqus tsev. Nws yog lub tshuab nqus tsev uas siv dav tshaj plaws. Nqus sintering tsis txhob muaj pa phem rau cov khoom tsis zoo ntawm cov hmoov metallurgy qhov chaw.

Qhov thib ob yog los tswj cov huab cua: qhov cua no tau muab faib ua exothermic (tsis muaj cua sov sab nraud yuav tsum tau) thiab nqus (sab nraud cua sov yuav tsum tau), uas yog hloov los ntawm hydrocarbons.

Hom exothermic tuaj yeem siv los tswj cov ntsiab lus carbon hauv cov khoom sintered ntawm cov hlau txhaj tshuaj molding, suav nrog kev txhaj tshuaj molding. Nws tuaj yeem muab faib ua lub teeb thiab nruab nrab roj. Cov pa roj carbon muaj peev xwm ntawm lub teeb thiab nruab nrab roj yog ob qho tib si qis heev. Rau cov pa roj carbon tsawg, cov khoom siv tooj liab tsuas yog tsis muaj oxidative cua sov tom qab sintering; Lub peev xwm carbon siab ntawm cov pa nruab nrab tuaj yeem siv los tiv thaiv ib feem ntawm oxidation ntawm hlau puag thiab tooj liab puag ntawm cov hmoov metallurgy thiab decarburization ntawm txo cov hlau puag.

Hauv cov hlau txhaj tshuaj molding (MIM), qhov txo qis peev xwm ntawm qhov chaw endothermic thiab exothermic cua muaj zog dua. Cov pa roj carbon ntau muaj peev xwm tswj tau qhov cua yog siv rau cov hlau raws li cov hlau thiab tooj liab raws li qhov chaw, los tiv thaiv qhov chaw sintering, thiab qee zaum rau carburizing.

Huab cua huab cua: Qhov chaw sintering no feem ntau yog los ntawm huab cua hauv qhov cub sintering, uas tuaj yeem suav tau tias yog sintering nyob rau hauv atmospheric siab, thiab feem ntau yog siv hauv cov khoom siv hlau sib xyaw thiab cov khoom siv sintering.

Yuav kom suav tau, nyob rau hauv cov txheej txheem sintering ntawm cov hlau txhaj tshuaj molding cov khoom, xaiv cov roj theem tsim nyog sintering txoj kev yog qhov tsim nyog rau kev txhim kho qhov ntom ntawm cov khoom thiab tau txais cov khoom nrog kev ua tau zoo.