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1.
本文作者首次提出了采用溶胶-凝胶技术制备高纯医用氟磷灰石粉末,研究了采用粉末冶金技术制取的FAP陶瓷的物理和力学性能,通过X射线衍射分析、差热分析和扫描电镜等分析手段,得出如下重要结论:FAP相结构稳定,在0-1350℃温度范围内无任何相变,命名其适合于通过高温烧结制备活性生物陶瓷。在1175℃下烧结90min,可以制得最佳性能的FAP陶瓷材料,其抗变强度为81MPa,抗压强度为372MPa.  相似文献   

2.
本文对高碳Si-Mn系相变诱发塑性钢的控冷热处理和力学性能进行了试验研究.结果表明:高碳Si-Mn系TRIP钢经控冷热处理后,在延伸率≥15%的条件下,屈服强度可以达到990~1350MPa,抗拉强度可达1160~1490MPa.在相同塑性水平下,比现用高强度锚杆的屈服强度高35~53%;抗拉强度高42~56%.这种钢不含贵重合金元素,成本低,热处理工艺简单,是一种很有前途的超高强度锚杆材料。  相似文献   

3.
利用煤矸石制备微米级多孔陶瓷   总被引:10,自引:0,他引:10  
煤矸石经粉碎,预烧,骨料分级后,以5%的聚乙烯醇溶液为粘合剂,将熟料塑化成型,经高温烧制出显气孔率在5.5%~51.0%,平均孔径在2.0~41.5μm,抗弯强度为3.0~23.2MPa孔径分布狭窄的多孔陶瓷材料。  相似文献   

4.
本文对高碳Si-Mn系相变诱发塑性钢的控冷热处理和力学性能进行了试验研究。结果表明:高碳Si-Mn系TRIP钢经控冷热处理报,在延伸率≥15%的条件下,屈服强度可以达到990-1350MPa,抗拉强度可达1160-1490MPa,在相同塑性水平下,比现用高强度锚杆的屈服强度高35-53%;抗拉强度高43-56%。这种钢不含贵重合金元素,成本低,热处理工艺简单,是一种很有前途的超高强度锚材料。  相似文献   

5.
高性能喷射混凝土的耐久性研究   总被引:11,自引:0,他引:11  
本项研究采用了高活性细掺抖的水泥裹砂、水泥裹石工艺,喷射混凝土的耐久性大大提高,抗渗标号达到0.8MPa,碳化系数为0.88,腐蚀系数为0.78,干缩率降低16.6%,长期强度(360d)达到40.7MPa,对耐久性提高的原因进行了分析。  相似文献   

6.
电子工业用的低电阻Cu-Be弹性合金含有量0.25%~0.72%Be,1.3%~1.5%Ni,余量为Cu.采用真空熔炼非真空浇注,热开坯,冷加工制成板材。经过860~900℃淬火,进行40%的冷加工,在400~80℃,时效2.5h后,合金获得下列性能:电阻率4.06~4.27×10 ̄(-5)Ω·cm,弹性模量120540~137200Pa,抗拉强度514~789MPa,延伸率14~34,硬度Hv=160~230.  相似文献   

7.
抗高压水闸墙的设计与施工   总被引:2,自引:0,他引:2  
董庄煤矿施工的-560m太原组水闸墙,在静水压力在室4.0MPa时,其堵水效率达98.5%,介绍了该水闸墙的设计与施工方法愉及理想的施工效果和显著的经济效益。  相似文献   

8.
本文采用DHDECMP萃取树脂为固定相、3mol/LHNO3为流动相的萃取色谱法使杂质元素与铀基体分离,杂质流出液引入ICP测定。取样200mg时,Ti、V和Mo的测定下限分别为:0.08×10-6、0.34×10-6、0.6×10-6。当各元素的加入量为5.0×10-6时,方法加入回收率在94%-99%之间,相对标准偏差≤14%。  相似文献   

9.
李晋平  吴锋 《矿冶工程》1994,14(1):63-65
对TiFe0.86Mn0.1/L-沸石包合物的热力学和动力学性能进行了研究,与TiFe0.86Mn0.1比较发现,两者的热力学性能存在着明显的差异而动力学控制步骤相同,均受成核及长大控制。复合储氢材料的研究是寻找新型储氢材料、改善性能的有效途径。利用沸石和TiFe0.86Mn0.1合金的特性制备的TiFe0.86Mn0.1/L-沸石包合物是一种不同于单一合金的复合材料^[1]。作为储氢材料,其热力  相似文献   

10.
对TiFe_0.86Mn_0.1/L-沸石包合物的热力学和动力学性能进行了研究,与TiFe_0.86Mn_0.1比较发现,两者的热力学性能存在着明显的差异而动力学控制步骤相同,均受成核及长大控制。复合储氢材料的研究是寻找新型储氢材料、改善性能的有效途径。利用沸石和TiFe_0.86Mn_0.1合金的特性制备的TiFe_0.86Mn_0.1/L-沸石包合物是一种不同于单一合金的复合材料 ̄[1]。作为储氢材料,其热力学和动力学性能在实际应用和理论研究中是极为重要的。对于LaNi_5体系,许多作者报道过其动力学方面的特性及反应机理 ̄[2.3.4],H.S.ChungandJ.Y.Lee ̄[5]对TiFe基合会的动力学也进行了研究。热大学研究同样受到人们的重视。本文主要讨论TiFe_0.86Mn_0.1/L-沸石的热力学及动力学性能  相似文献   

11.
正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium  相似文献   

12.
<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy  相似文献   

13.
正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared  相似文献   

14.
<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth  相似文献   

15.
正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products  相似文献   

16.
文奇 《中州煤炭》2018,(6):175-178
高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。  相似文献   

17.
<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why  相似文献   

18.
正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.  相似文献   

19.
<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel  相似文献   

20.
正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.  相似文献   

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