Kev tshawb fawb tseem ceeb ntawm cov ntaub ntawv sib txhuam

Kev tshawb fawb tseem ceeb ntawm cov ntaub ntawv sib txhuam
Txhawm rau hloov mus rau kev txhim kho lub tshuab kev lag luam, kev ua kom zoo dua qub thiab tshawb nrhiav cov ntaub ntawv sib txhuam tshiab, tsom rau cov hauv qab no: txhawm rau txhim kho qhov hnav tsis kam ntawm cov khoom siv, uas txiav txim siab lub neej kev pab cuam ntawm cov khoom siv braking; kom tau txais qhov siab txaus thiab ruaj khov coefficient ntawm kev sib txhuam kom ntseeg tau tias muaj kev ntseeg siab thiab du ntawm kev ua haujlwm ntawm cov khoom siv braking thiab kis tau tus mob.
Lub tshav kub tsis kam ntawm cov ntaub ntawv kev sib txhuam yog qhov tseem ceeb los ntawm ob qhov ntsuas: qhov kev tiv thaiv rau oxidation ntawm qhov kub thiab txias thiab lub peev xwm ntawm cov hlau matrix uas cov khoom siv los tswj kom muaj zog txhua yam. Txhawm rau kom ua tiav cov haujlwm kub siab dua, tau hloov mus rau ntau cov hlau refractory thiab ntau cov alloying. Xws li nyob rau hauv lub hnyav load nyob rau hauv ntau hlau raws li cov ntaub ntawv es tsis txhob ntawm bronze raws li cov ntaub ntawv: nyob rau hauv thiaj li yuav txhim kho lub kub ua hauj lwm thiab mechanical zog txwv ntawm tooj liab raws li cov ntaub ntawv, aluminium es tsis txhob ntawm tin los ua tooj liab alloying; hlau raws li cov ntaub ntawv ntxiv ntawm npib tsib xee, cobalt, chromium, manganese, tungsten, molybdenum thiab lwm yam khoom los ua cov hlau alloying, txhawm rau txhim kho cov hlau raws li kev sib txhuam cov khoom thermal stability thiab txhua yam muaj zog.
Hlau-raws li kev sib txhuam cov ntaub ntawv nyob rau hauv kev sib cuag nrog hlau nyob rau hauv high kub. Cov graphite tsis ruaj khov kuj tseem nce ntxiv los hloov los ntawm inert anti-seize agents (xws li boron nitride ). Nyob rau hauv hnyav loads, nickel- thiab tungsten-based hmoov metallurgical kev sib txhuam cov ntaub ntawv raug npaj. Txhawm rau txhim kho lawv cov oxidation tsis kam, kev sib txhuam cov ntaub ntawv raws li cov hlau tsis muaj steel fibers tau thov. Rau kev hnav tsis kam, tib qhov sib txuam ntau yog siv los ua kom lub zog ntawm cov hlau matrix ntawm cov khoom sib txhuam.
Txhawm rau txhim kho thiab ruaj khov ntawm cov coefficient ntawm kev sib txhuam, ntau txoj haujlwm tshawb fawb tau ua tiav los ntawm kev tshawb nrhiav cov tshuaj tiv thaiv kev sib txhuam tshiab thiab cov tshuaj tiv thaiv. Txhawm rau txhim kho cov coefficient ntawm kev sib txhuam ntawm cov khoom siv hlau sib txhuam ntxiv cov khoom sib txuas xws li: boron carbide, silicon carbide, zirconium carbide, boron nitride, thiab lwm yam. nitride los hloov.
Hauv cov khoom siv tooj liab, silica, asbestos, mullite thiab aluminium oxide yog siv tau zoo los ua kev sib txhuam los txhim kho coefficient ntawm kev sib txhuam. Molybdenum disulphide, tungsten disulphide thiab boron nitride tau siv dav hauv cov khoom siv hlau los kho cov coefficient ntawm kev sib txhuam thiab txhim kho cov khoom tiv thaiv scuffing. Cov fusible hlau lead, tin, bismuth, antimony, cadmium thiab lwm yam additives them ntau xim rau, lawv nyob rau hauv kev sib txhuam vim qhov kub thiab txias thiab tig mus rau hauv kua, los tiv thaiv zus tau tej cov stick-slip phenomenon, kom stabilize tus coefficient. ntawm kev sib txhuam yog qhov zoo. Nyob rau hauv cov khoom sib txhuam kom ntxiv dua cov ntshiab carbide los yog ntshiab nitride ntau ruaj khov, siab zog ntawm cov complex compound tau ua hauj lwm ntau heev. Hlau-raws li thiab tooj liab-raws li cov ntaub ntawv nyob rau hauv ib tug khoom tov hom titanium los yog zirconium oxygen, carbon, nitrogen compounds TiO-TiN-TiC los yog Zr-ZrO-ZrN, coefficient ntawm kev sib txhuam ntawm cov khoom no yog 0.55 , hnav tsis kam tuaj yeem nce ntau dua 9 zaug.
Ntawm kev sib txhuam ceev ntawm 40 ml / s, cov ntaub ntawv sib txhuam nrog ntau dua 2% titanium oxide thiab 3% mus rau 10% oxides ntawm silicon, aluminium, zirconium, magnesium, beryllium, calcium thiab chromium hauv cov khoom siv hlau thiab tooj liab. pom zoo.
Ib qho ntawm cov lus qhia tshiab tau thov yog kom muaj qhov pores ntawm pre-sintered hlau matrix suav nrog cov hmoov av iav hmoov, uas yog ua los ntawm impregnating nws nrog silicone resin uas muaj cov khoom tshem tawm ntawm iav, ua raws li kev kho cua sov ntxiv.
Yog hais tias yav dhau los kev tsim cov hmoov hlau metallurgical kev sib txhuam cov ntaub ntawv yog tsuas yog raws li cov tswv yim kev paub, nyob rau hauv lub neej yav tom ntej lub ntsiab xim yuav tsum tau them rau txoj kev kawm ntawm lub mechanism ntawm kev sib txhuam thiab hnav thaum lub sij hawm lub lag luam ntawm cov kev sib txhuam khub, uas yuav muab ib tug scientific kev. hauv paus rau kev tsim cov ntaub ntawv sib txhuam nrog cov khoom tsim nyog.