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γ—TiAl增压涡轮熔模铸造过程数值模拟研究 总被引:9,自引:0,他引:9
根据熔模型壳离心浇注的铸造工艺特点,建立了γ-TiAl增压涡轮凝固传热过程的数值模型,推导了离心压力下γ-TiAl金属间化合物的凝固收缩和补缩过程数学模型,模拟计算了γ-TiAl增压涡轮铸件的温度场和收缩缺陷,结果表明,模型能可靠计算γ-TiAl增压涡轮铸件凝固过程的温度分布和准确预测铸件的收缩缺陷,数值模拟结果与实验结果吻合良好,数值模拟结果证实了前期工作所提出的进一步减少及消除收缩缺陷的优化工艺措施的合理性。 相似文献
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DZ40M钴基合金铝化物涂层的循环氧化 总被引:2,自引:0,他引:2
以新型定向凝固钴基高温合金DZ40M为基体,研究其低压化学气相沉积铝化物涂层的循环氧化行为,发现该涂层具有较高的抗循环氧化性能,涂层与基体结合良好。涂层退化主要是由外表面氧化膜的愈合消耗Al源所造成,沉积渗剂中加入Ti可加速涂层的退化。 相似文献
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Mo—La2O3烧结坯间隙杂质的研究 总被引:2,自引:0,他引:2
通过扫描电镜(SEM)、电子探针(EPMA)、X射线衍射(XRD)及俄歇电子能谱(AES)研究了Mo-La2O3烧结坯中的间隙杂质。结果表明:La2O3的加入提高了烧结睛坯的抗弯强度和韧性。间隙杂质不驻存在于Mo中,而且在La2O3粒子表面吸附,使晶界杂质浓度降低。 相似文献
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Jin Zhouying 《AI & Society》2002,16(1-2):21-48
This research focuses on the driving forces of technology development and the interactive relationships between technology
and the factors that promote economic development and social progress. It aims at presenting a basic theory for sustainable
development, as well as a foundation for decision-makers for drawing up an integrative strategy. As such it is an attempt
at how to create harmonious relations between human progress, technology, economy, and society. 相似文献
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Constructivist Management of Knowledge,Communication and Enterprise Innovation: Lessons from Indian Experience 总被引:1,自引:1,他引:0
Prime movers of enterprise innovation are inside the organisation. The enterprise NIIT, studied in this paper, tells us how
elicitation and recognition of knowledge and its contents set an enterprise on the move. Recognised knowledge is actionable.
Each act of recognition is an addition to knowledge content, and such additions took place in NIIT through acts of communications
and self-searching. These contents form a large collage that cannot be strewn into a single novelistic episode. Perspectives
and context, motives and suggestions render to each member of the enterprise different disjoint appearances of knowledge.
There are thus many knowledge systems and multiple narrations, each with small episode-like finality. Enterprise innovation
is achieved not through any grand episodic integration of all knowledge contents, but by constructively eliciting further
new contents of knowledge, and encouraging acts of communications and discourses on this new knowledge. Constructive management
of knowledge and communication towards enterprise innovation has thus been defined. Through such constructive management,
NIIT enabled itself innovationally and empowered its members in eliciting knowledge and acting communicatively. A critical
feature of knowledge work is that it requires multidisciplinary expertise and mutual learning in order to achieve a complex
synthesis of highly specialised state-of-the-art technologies and knowledge domains. A convivial work culture and a culture
of communicative acts enable sharing of the non-informatised yet recognised contents of knowledge. 相似文献