西华大学学报(自然科学版)
西華大學學報(自然科學版)
서화대학학보(자연과학판)
JOURNAL OF XIHUA UNIVERSITY(NATURAL SCIENCE EDITION)
2012年
4期
15-18
,共4页
铝硅共晶合金%粉末冶金%冷镦%局部熔化%烧结骨架
鋁硅共晶閤金%粉末冶金%冷鐓%跼部鎔化%燒結骨架
려규공정합금%분말야금%랭대%국부용화%소결골가
Al-Si eutectic alloy%powder-metallurgy%upsetting%local melting%skeleton frame
采用烧结及后续的镦粗工艺制备了铝硅共晶合金块体材料,研究了烧结温度对烧结体显微结构、抗压强度及相对密度的影响.结果表明:烧结温度显著影响烧结体的显微结构和抗压强度,以临近铝硅共晶合金液相线的温度烧结时,发生了局部熔化,产生的熔融液体破坏了颗粒表面的氧化膜,颗粒之间相互黏结,形成了烧结骨架.以优化的555℃烧结,Si颗粒呈球状,抗压强度达到最佳,但相对密度未发生变化.在后续的冷镦过程中,烧结骨架及粉末颗粒均产生变形,孔隙减小,颗粒呈扁平状,相对密度达到了98%.
採用燒結及後續的鐓粗工藝製備瞭鋁硅共晶閤金塊體材料,研究瞭燒結溫度對燒結體顯微結構、抗壓彊度及相對密度的影響.結果錶明:燒結溫度顯著影響燒結體的顯微結構和抗壓彊度,以臨近鋁硅共晶閤金液相線的溫度燒結時,髮生瞭跼部鎔化,產生的鎔融液體破壞瞭顆粒錶麵的氧化膜,顆粒之間相互黏結,形成瞭燒結骨架.以優化的555℃燒結,Si顆粒呈毬狀,抗壓彊度達到最佳,但相對密度未髮生變化.在後續的冷鐓過程中,燒結骨架及粉末顆粒均產生變形,孔隙減小,顆粒呈扁平狀,相對密度達到瞭98%.
채용소결급후속적대조공예제비료려규공정합금괴체재료,연구료소결온도대소결체현미결구、항압강도급상대밀도적영향.결과표명:소결온도현저영향소결체적현미결구화항압강도,이림근려규공정합금액상선적온도소결시,발생료국부용화,산생적용융액체파배료과립표면적양화막,과립지간상호점결,형성료소결골가.이우화적555℃소결,Si과립정구상,항압강도체도최가,단상대밀도미발생변화.재후속적랭대과정중,소결골가급분말과립균산생변형,공극감소,과립정편평상,상대밀도체도료98%.
The Al-Si eutectic alloy blocks are prepared by sintering and post upsetting.The effects of sinter temperature on microstructure,compressive strength,and relative density of sintered billets are investigated.It is shown that the sintering temperature influences sensitively the microstructure and compressive strength of sintered billets.Sintered at the temperature near to liquidus boundary of Al-Si eutectic alloy,some local melting occurs.The melted liquid disrupts the oxide film covering the particles.Particles bond with each other to form skeleton frame.The optimal sintering temperature is 555 ℃,at which the Si particle is spherical-like and the compressive strength is better,but the relative density almost has no change.During post upsetting,the skeleton frame and the particles are deformed.The pore space reduces and the particles become into flat.The relative density reaches to 98%.