【摘要】 将超重力技术和燃烧合成技术相结合实现了一种可直接熔融铸造陶瓷材料的新型制备方法。以Al粉、NiO2粉、Y2O3粉为原料,在不同水平超重力场的作用下,通过燃烧合成技术制备出致密的YAG(Y3Al5O12)块体陶瓷。利用XRD和SEM对产物的主要成分和形貌进行了表征,并利用阿基米德法分别测量了不同超重力系数下产物的密度。实验结果表明,通过超重力场,实现了制备陶瓷的致密化,所合成的YAG陶瓷具有较高的致密度,最高可达98.6%。随着超重力场的提高,陶瓷的致密度有着显著的提高。较高的超重力促进了熔体中金属、陶瓷、气体各相分离,促使陶瓷熔体致密化。超重力辅助燃烧合成技术也有望实现其他各种陶瓷材料和新型材料的熔融铸造。更多还原

【Abstract】 Ultra-high gravity and combustion synthesis are combined to achieve a new type of materials preparation:direct melt-casting of ceramics. Al powder,NiO2 powder,and Y2O3 powder were used as raw materials,and densified YAG (Y3Al5O12) ceramics were prepared by combustion synthesis under ultra-high gravity of different levels. XRD and SEM were used to characterize the phases and morphology,and the densities of products prepared under different ultra-high gravity were measured by Archimedes law. The results showed that ultra-high gravity field densified the ceramics,so the YAG ceramics have a high density,which can reach up to 98.6%. The ceramics densities were improved significantly with the increase of ultra-high gravity. Higher ultra-high gravity accelerated the separation of melt metals,ceramics and gas,and then densified the ceramics products. Combustion synthesis under ultra-High gravity is expected to achieve the melt-casting of various ceramics materials and new materials.更多还原