共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
一、中国钨及硬质合金工业目前在世界钨市场的现状 中国是世界钨资源大国,其储量、年产量及出口量居世界三个第一。建国伊始,中国钨业就在国际、国内两个市场融通。从1949年至1992年的四十三年间,中国钨精矿累计产量166万吨,累计出口量85万吨,出口量占产量的一半以上。20世纪70年代,中国以出口钨精矿为主。自80年代开始,随着国内钨冶炼和加工业的发展,引起了出口产品结构 相似文献
4.
5.
6.
7.
8.
9.
10.
11.
12.
我国硬质合金行业技术创新体制的研究 总被引:2,自引:0,他引:2
剖析了硬质合金行业科技创新体制的现状,提出了新的对策,必须进行认识、观念、理论上的创新,建立行业硬质合金工程中心,加强知识产权保护和行业交流与合作。 相似文献
13.
14.
本文以2011年上半年钨市场变化情况为主要研究对象,对国内外钨价格变化情况、生产情况、进出口情况、需求情况进行了研究,并结合相关数据分析了产生的原因及其对硬质合金行业的影响。预计未来较长的时期一方面国内外钨的需求量仍将继续增长,另一方面由于钨价格仍将在高位振荡,硬质合金行业的盈利水平将进一步降低,生产风险将进一步增加。这将促进硬质合金行业内企业经营方式和产品结构的调整,从而推动全行业的发展。 相似文献
15.
我国硬质合金行业面临的资源困境与对策 总被引:2,自引:0,他引:2
钨是硬质合金行业重要的原料,消耗比例在50%以上。从1994年到2001年,世界钨储量减少40×104t,其中我国减少了25×104t,占62.5%。在我国578.6×104t钨资源储量中,可较好利用的基础储量仅为139×104t。因此,我国的钨资源优势将不复存在。我国作为世界上最大的硬质合金生产、消费与出口国,硬质合金制造业发展迅猛,产量由1996年的6630t增加到2004年的1700t(2005年为1600t),因而消耗了大量的钨资源。而随着我国钨资源的逐渐消失,硬质合金企业也将面临资源危机。为此,提出了建设资源节约型社会、增加资源税、提高企业的自主创新能力、加快无钨硬质合金产品的研制和产业化步代、加大废钨的再生利用、打造优势产业集团等应对措施。 相似文献
16.
17.
18.
金刚石涂层用硬质合金基体表面预处理研究新进展 总被引:6,自引:0,他引:6
从孔隙的形成、界面非金刚石物的形成以及较高残余应力等3个不利方面,分析和综述了影响金刚石涂层与硬质合金基体粘结性的主要因素。着重对浸蚀基体表面除去Co相或浸蚀WC相,在基体与涂层之间形成中间过渡层或中间化合物,基体表面机械或热处理等硬质合金基体表面预处理,改善涂层与基体粘结性的3种方法和途径进行了阐述。 相似文献
19.
The performance of cemented carbide inserts coated with various PVD-films in milling Inconel 718 is evaluated by innovative analytical and experimental methods. Three PVD films with different micro and macro structures were applied. The coatings’ strength properties were detected by nanoindentations and by impact tests at various temperatures. These results were considered in FEM calculations of the material removal process to determine the mechanical and thermal loadings of the cutting wedge. Employing this innovative methodology, it is possible to capture proactively the effect of the cutting conditions on tool wear, thus reducing the effort dedicated in traditional sequential cutting experimentation. 相似文献
20.
An Experimental Study of the Corrosion Behavior of Nickel Tungsten Carbide in Some Water-Glycol Hydraulic Fluids for Subsea Applications 总被引:1,自引:0,他引:1
Lei Zheng Anne Neville Andrew Gledhill David Johnston 《Journal of Materials Engineering and Performance》2010,19(1):90-98
Corrosion failures of components in electro-hydraulic control systems can have serious consequences for the operation of an
entire subsea oil recovery system, especially in water depths more than 150 m (Fleming, Meas. Control, 2000, 33(7), p 207–213). An acceptable reason for this is that seawater ingress can have a great effect on stainless steel
316L, the most commonly used material for the failed components of the direction control valves, since chloride irons destabilize
the passive film [Malik et al., Corros. Sci., 1992, 33(11), p 1809–1827; Desalination, 1994, 97(1–3), p 189–197; Al-Malahy and Hodgkiess, Desalination, 2003, 158(1–3), p 35–42]. Other materials, claimed to be seawater tolerant, are starting to be used in this system. However,
problems can still exist due to the complex factors relating to the corrosion process and how the environmental parameters
affect the corrosion mechanisms. In this work, the corrosion behavior of a nickel tungsten carbide cermet, one of the proposed
materials, is compared with stainless steel 316L, in four different water-glycol hydraulic fluids and 50% hydraulic fluid/50%
seawater solutions using an electrochemical test methodology. Systematic fluid analysis, which includes GC-MS for organic
components and ICP-MS analysis for ionic content, and surface analysis of the material are carried out to assess the corrosion
mechanisms. Detailed conclusions are then made to summarize the advantages and disadvantages of nickel tungsten carbide being
used in this system. The effects of each factor on the corrosion rates and mechanisms are discussed. 相似文献