Kev soj ntsuam luv luv thiab cov ntaub ntawv sib txhuam ua ke nrog kev tsim cov khoom siv
Lwm hom kev sib txhuam cov ntaub ntawv uas tau tsim nyob rau hauv parallel nrog cov organic sib txhuam cov ntaub ntawv thiab feem ntau siv yog cov hmoov metallurgical kev sib txhuam cov khoom. Nyob rau hauv 1929 Schwarzkopf ntawm lub qub USSR patented thawj sintered khoom rau kev sib txhuam, uas yog ib tug alloy uas muaj me me ntawm txhuas, tin, thiab tooj liab puag. Tebchaws Meskas tau pib ua haujlwm no hauv xyoo 1929, thiab thawj zaug siv cov khoom siv no yog nyob rau ntawm daim hlau clutch rau D-7 thiab D-8 Scrapers thaum xyoo 1930's. cov khoom siv los ua cov phaj clutch ntawm D-7 thiab D-8 Scrapers. Cov khoom siv thawj zaug hauv xyoo 1930s nyob rau hauv cov clutch discs ntawm D-7 thiab D-8 scrapers. Xyoo 1932, General Motors tau tsim cov khoom siv sintered rau clutch discs, uas tau txais los ntawm kev lag luam aerospace thaum lub sijhawm.
Lub hauv paus ntsiab lus tseem ceeb ntawm cov txheej txheem ntawm cov hmoov metallurgy kev sib txhuam cov ntaub ntawv yog embodied nyob rau hauv ib tug patent tau los ntawm Wilmer thiab nws cov npoj yaig nyob rau hauv lub teb chaws USA ntawm 1937 thiab 1941. Cov patent siv tin bronze raws li cov hlau matrix rau cov khoom sib txhuam, uas yuav ua tau. ntxiv nrog zinc rau alloying. Hlau thiab silica tau ntxiv los ua kom cov coefficient ntawm kev sib txhuam, thiab graphite thiab txhuas tau ntxiv ua lubricating Cheebtsam.
Qee lub sij hawm nyob ib ncig ntawm 1950-1980, hmoov metallurgy kev sib txhuam cov ntaub ntawv tau ntse siv hauv cov chaw ua haujlwm qhuav thiab ntub dej. Lub teb ntawm daim ntawv thov tau nthuav dav suav nrog cov brakes thiab clutches rau cov tsheb nruab nrab thiab hnyav, tshuab ua liaj ua teb thiab lwm yam. Txij li thaum xyoo 1958 lub tuam txhab British Frood tau tsim cov khoom siv tooj liab-, hlau- thiab ceramic-raws li kev sib txhuam hauv kev koom tes nrog Asmeskas cov tuam txhab SK Wellman thiab Bendix Aerospace.
