课程文献中心 更多>>

关键词： 结构设计管理   房地产项目   成本控制   影响分析   对策  

摘要： 地产行业竞争的加剧让越来越多的开发企业开始关注成本控制问题.合理的成本管控方法能够帮助企业创造更大效益,作者从事建筑结构设计管理工作十三年(包含四年地产甲方项目设计管理经验),具有丰富的项目设计和项目管理经验,文章聚焦于结构设计管理,并结合实际项目探讨结构设计管理和成本控制之间的影响关系,以供参考.

关键词： Sintered alumina  

摘要： The influence of various sintering atmospheres (vacuum, CO2 and N2) on the transparency of alumina ceramics was investigated using the two-step pulsed electric current sintering (TS-PECS). Samples sintered under a CO2 atmosphere exhibited lower transparency with a darker coloration due to carbon contamination resulting from CO2 gas during TS-PECS. In contrast, sample darkening was reduced by switching from CO2 to vacuum during the TS-PECS process. Switching between CO2 and vacuum atmospheres suppressed carbon deposition caused by CO gas generated from the CO2 and graphite die/sheet. Samples sintered under an N2 atmosphere exhibited lower transparency and density compared to those sintered in vacuum. This is due to the slow diffusion of N2 in alumina, which leads to N2 retention in closed pores and impedes densification. Notably, higher transparency was observed in samples sintered by switching the atmosphere from vacuum to N2 during the TS-PECS process compared to those sintered solely under vacuum. Optimizing gas and atmosphere profiles during PECS is essential for achieving the desirable transparency and density of alumina ceramics. ©2025 Japan Society of Powder and Powder Metallurgy.