MATECH tau tsim ultra-high-density carbon/carbon composite cov ntaub ntawv.
Raws li tsab ntawv tshaj tawm tshiab los ntawm MATECH, lub tuam txhab tau ua tiav kev tsim cov khoom siv hluav taws xob ultra-high-density carbon fiber-reinforced carbon-based (C/C) composites. Qhov kev siv thev naus laus zis no txhim kho lub ablative thiab oxidation tsis kam ntawm C / C composites los ntawm 20 npaug piv rau cov ntaub ntawv C / C uas twb muaj lawm, ua rau lawv tsim nyog rau kev thov xws li cov cuaj luaj high-speed thiab ballistic reentry lub qhov ntswg cones thiab ua ntug.
MATECH yuav nthuav tawm qhov kev tsim kho patented no ntawm 47th Composite Materials, Materials, and Structures Conference (CMS), muaj nyob rau hauv St. Augustine, Florida, USA, thaum Lub Ib Hlis 23, 2024. MATECH's Field-Assisted Sintering Technology (FAST) ua rau lub ntau lawm ntawm ntom C / C composites nrog unprecedented siab ceev.
Los ntawm kev ua haujlwm ntawm cov txheej txheem tshiab no, Anche tau ua tiav qhov ntom ntom ntom ntawm ntau dua 2.20 g / c cm3 rau qhov tseeb ntawm kev ntseeg siab ntawm graphite (2.26 g / cm3). Tsis tas li ntawd, ib qho tseem ceeb ntawm fiber ntau rub tawm tau pom thaum lub sijhawm tawg. FAST carbon-carbon composites tau yooj yim txuas mus rau lub qhov ntswg cones thiab ua cov npoo ntawm cov cuaj luaj high-speed. Tsis tas li ntawd, cov txheej txheem muaj kev nyab xeeb, raug nqi, thiab ncaj qha. Qhov no patented technology (US Patents 10464849 thiab 10774007) nthuav dav ntawm MATECH txoj haujlwm dhau los hauv kev nrawm nrawm ntawm SiC/SiC thiab C/SiC CMCs.
High-density C/C composites tau pib siv rau ballistic reentry qhov ntswg cones nyob rau hauv 1960s thiab 1970s. Lub high-density carbon, tau los ntawm kub isostatic nias thiab impregnation carbonization txheej txheem, hloov cov ntom monolithic graphite. Txawm li cas los xij, cov txheej txheem no tau cuam tshuam nrog qee qhov kev pheej hmoo, cov nqi siab, thiab kev nyuaj. Tsis tas li ntawd, cov txheej txheem yav dhau los feem ntau tsim C / C sib xyaw nrog qhov siab tshaj plaws ntawm 1.95 g / cm3, thiab tsis muaj lwm cov txheej txheem ua kom cov pa roj carbon-carbon sib xyaw ua ke.
Patented technology rau high-density composite
Headquartered hauv California, Tebchaws Asmeskas, MATECH tau tsim muaj xyoo 1989 los ntawm Dr. Ed Pope. Raws li Pope, lub tuam txhab tau ua haujlwm rau kev nce qib 2700 degree F Ceramic Matrix Composites (CMCs) kom ua tau zoo dua cov cav turbine. Txawm li cas los xij, txoj hauv kev tseem ceeb tau pib nrog CMCs ntawm 40-50% qhov ntom ntom thiab siv Field-Assisted Sintering Technology (FAST), ua rau qhov ntom ntom ntawm 100% thiab kev ua haujlwm tsis zoo vim muaj fiber ntau puas. Yog li ntawd, lub tuam txhab pom tau hais tias yuav tsum tau densification los ntawm qhov pib nrog preforms, ua tiav txo porosity rau 7-10%. MATECH tom qab tau pom tias muaj peev xwm ua tiav qhov ntom ntom SiC / SiC nrog qhov ntom ntom txog 99.9% hauv tsawg dua 10 feeb, nrog rau qhov xav tau lub zog thiab tawv ntawm CMCs.
MATECH cov txheej txheem patented (sab saum toj) siv cov txheej txheem Field-Assisted Sintering Technology (FAST) cov cuab yeej (hauv qab), uas siv lub zog tam sim no thiab siab rau CMC qhov chaw los ntawm cov pwm, txhim kho cov khoom reactivity thiab kub los ntawm Joule cua sov.
Txhawm rau ua kom pom qhov ua tau zoo ntawm cov txheej txheem no, MATECH pib nrog cov geometries yooj yim xws li cov discs thiab cov phiaj xwm duab plaub. Ntau qhov geometries, zoo li lub tshuab aerospace ob lub ntsej muag pom nyob rau hauv daim duab, tuaj yeem tsim hauv FAST pwm siv cov cuab yeej graphite, uas yog tsim los rau Prepreg-Integrated Pressure (PIP) tab sis tsis tau siv los tsim cov khoom ceev ceev. Lub sij hawm ceev ceev, siab, thiab qhov kub thiab txias rau shaping qhov chaw yog tib yam li cov geometry tiaj tus. Raws li kev tshawb fawb no, Pope tau txais ob daim ntawv pov thawj: ib qho hauv 2019 rau cov txheej txheem thiab lwm qhov hauv 2020 rau cov khoom siv.
Qhov ntom ntawm MATECH's SiC/SiC thiab C/SiC CMCs siv cov kev ntxhov siab xws li 30 txog 100 megapascals. Qhov no yog qhov feem ntau siv hauv kev ua haujlwm nrawm, nrog rau qib tam sim no txij li 2,500 txog 10, 000 amperes, nyob ntawm tus qauv loj. Txawm li cas los xij, qhov tam sim no yog concentrated nyob rau hauv luv luv bursts, ua rau nws ntau npaum li cov pa kub pressing hom kev kawm. Tsis tas li ntawd, cov cua sov yog tsim nyob rau hauv cov khoom siv, tsis yog siv rau sab nraud. Los ntawm kev siv lub zog tam sim no thiab pwm, lub zog thermal tau zoo nce thaum tseem qhia txog lub zog vibrational, ua rau cov khoom siv ntau dua.