稀土在H13模具钢低温粉末渗硼中的应用

对低温加稀土粉末渗硼进行了研究，初步探讨了稀土含量和工艺因素对渗层组织和性能的影响。结果表明，在低温下，加稀土渗硼仍具有比较明显的“滑化”效果，能够提高渗硼层的耐磨性；合适的稀土加入量促使渗层趋向均匀、致密，并有一定的催渗作用。     

稀土对低温固体B-C-N共渗的影响

本文研究了硼－碳－氮－稀土（Ｂ－Ｃ－Ｎ－ＲＥ）共渗工艺及共渗层的组织性能，并与硼－碳－氮（Ｂ－Ｃ－Ｎ）共渗工艺及共渗层的组织性能进行了比较，结果表明，在适当范围内，稀土具有明显的催渗作用；与Ｂ－Ｃ－Ｎ共渗相比，Ｂ－Ｃ－Ｎ－ＲＥ共渗层的耐磨性和耐蚀性明显提高。本文对Ｂ－Ｃ－Ｎ－ＲＥ共渗的机理及稀土元素的作用作了初步的探讨。     

硼钒,硼铬复合渗的微观组织与性能研究

本文对T10,GCrl5等钢样的单渗硼及硼钒、硼铬复合渗的微观结构利用透射电镜、X射线衍射仪等进行了分析,对其耐磨性能进行了对比试验。提出了复合渗层的耐磨性能与其渗层的组织结构,组织的均匀性以及钢的基体组织有关。     

保温时间对硼铬稀土共渗层组织性能的影响研究

本文介绍了渗硼工艺的实验方法,实验材料的选用,并对渗硼层的显微组织进行了观察,分析了渗硼层的主要缺陷,并从保温时间方面,探讨了其对渗硼层质量的影响。     

多元共渗金属铜表面强化机制的研究

金属铜采用多元共渗后，可改变金属铜表面的组织结构和物理化学性能，既增加了表面强度，又不影响基体导热能力，从而提高部件的使用寿命，介绍了渗层的化学组成，元素分布，金相组织等与性能的关系，并对渗镀过程进行了模拟计算。     

纯镁渗锌处理表面合金化机制研究

对纯镁进行了表面渗锌处理，研究了扩渗温度及扩渗时间对于合金化渗层组织、相结构及反应层连续性的影响。结果表明：扩渗温度的选择有一个合适的范围，温度过低，扩渗速度太慢甚至Zn元素原子的能量达不到其激活能，不能产生活性原子，扩渗过程无法进行。温度过高虽然有利于形成合金化渗层，但会使基体晶粒粗化，甚至改变整个基体，而且，温度过高不利于反应层（金属间化合物区）的稳定：扩渗时间的延长会促使Zn的进入量和金属间化合物的生成量增加，并削弱晶界扩散优势的影响，最终使固溶层和反应层趋于均匀化。要形成连续的反应层，扩渗温度应控制在400℃～420℃，相应的扩渗时间为8h以上。     

稀土对硼铝共渗过程及渗层性能的影响

本文研究了双涂层法稀土硼铝共渗工艺及渗层的性能,考察了稀土对渗层厚度、渗层表面硬度和渗层组织形态的影响,获得了稀土加入量的最佳值。试验结果表明:加入稀土后渗速可提高近1倍,改善了渗层的组织形态及性能。     

45钢滴注式气体碳硼稀土共渗的研究

采用滴注式气体化学热处理方法对４５钢进行了表面强化的研究。在温度、时间、煤油滴量均相同的条件下，采用碳稀土共渗、碳硼稀土共渗和常规单纯渗碳３种工艺，从金相组织、渗层厚度和显微硬度的分布三方面作了对比试验，结果表明，碳硼稀土共渗试样的渗层度高于碳稀土共渗与单纯渗碳，以深度显著大于单纯渗碳，稍低于碳稀土共渗，显示了的催渗作用，同时试验了稀土加入量与渗层深度伯关系，找出稀土垢最佳加入量。     

纯铜多元合金共渗及渗Al层的研究

文章研究了纯铜多元合金共渗工艺及渗Ａｌ层的Ａｌ浓度分布及对α相结构的影响。结果表明，渗层表面Ａｌ含量与渗剂中纯Ａｌ粉含量及热处理工艺有关。渗层组织从外到内，依次为过共析、共析亚共析组织和α固溶体，α相的点阵常数随Ａｌ浓度增加呈直线上升。     

《辉光离子氧—硫—氮三元共渗工艺的试验研究》

本文阐述了用NH_3和SO_2进行辉光离子氧—硫—氮三元共渗工艺的试验研究。试样材料选用45~#钢、Cr_(12)MoV、3Cr_2W_8等。对共渗后的试样进行了渗层的组织分析和表面状态观察;用X—射线测定了渗层的相结构。用电子探针分析了共渗试样的表层成分;测量了渗层的显微硬度;讨论了不同流量比、温度、时间对渗层组织和渗层厚度的影响。结果表明:离子S—N—O共渗,其共渗温度:450—570℃,时间1～6h,先氮化后共渗,共渗后可以得到满意的共渗效果。     

Chinalco Signed Framework Agreement for Strategic Cooperation with Harbin Municipal Government

正Last month,Chinalco signed framework agreement for strategic cooperation with Harbin Municipal Government in Harbin Xiong Weiping,Chairman of Chinalco,said that based on the strategic deployment to build world top-class mining company with the highest growth potential,Chinalco was now concentrating all efforts on making strategic transition and structural adjustment,strategic cooperation with the local governments where     

Jiangxi Promotes Jiangxi Copper Corporation To Become The World's Most Competitive Mining Company

<正>According to the latest info from Jiangxi Province State-owned Assets Supervision and Administration Commission,Jiangxi Copper Corporation was approved to become the first pilot enterprise for deepening reform.Contents of the pilot work is"Three Self"(self expansion,self decision-making,self     

Journal of Rare Earths Contents List of Vol.32(2014)

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Contributions to Baosteel Technical Research wanted

正Baosteel Technical Research,a quarterly journal,which is issued domestically and abroad,is run and sponsored by Baosteel Group Corporation.Baosteel Technical Research mainly reports the achievements in technological innovation,academic research,new product development and industrial equipment improvement by Baosteel.It will continue to follow up on hot topics and serve the company’s technological development and progress.Its readers include experts in     

Ministry of Industry and Information Technology: No Short Term Solution For Our Country’s Excess Nonferrous Metal Smelting Capacity

【正】According to the Ministry of Industry and Information Technology,the Ministry has released the 2013 Operation Report on China’s Industrial Communication Indu...     

Chinalco Signed Framework Agreement for Strategic Cooperation with Gansu Province

正Recently,Chinalco and Gansu Provincial People’s Government signed"Framework Agreement for Strategic Cooperation on Reform,Restructuring and Transition Development of Chinalco’s Electrolytic Aluminum Enterprises in Gansu",signifying that the strategic cooperation between Chinalco and Gansu Province had made new substantive progress.     

Unavoidable Economic Cycle:30% Of Nonferrous Metal Companies Were Involved In Restructuring

正Owing to continual downturn in real estate and bulk commodity markets,a number of traditional industries in China suffered unfavorable impact in performance.With the progressive disclosure of third quarter report,the no-pleasant-surprise performance of     

Baotou Rare Earth Became the World's Biggest High Performance Magnetic Material Base

正The High Performance Magnetic Material Phase II Project,an industry upgrading project implemented by Inner Mongolia Baotou IronSteel Rare Earth(Group)Hi-tech Co.,Ltd,recently basically finished equipment commissioning,signifying that the enterprise had developed the production capacity of15000 t/a Nd-Fe-B strip casting alloy and 5000t/a Nd-Fe-B magnet,thus becoming the world’s     

Introducing Two Central Enterprises to Integrate Rare Earth Industry,Shandong Rare Earth Group Breaks Surface

正With the signing of"Letter of intention for Propelling Integration of Shandong Rare Earth Enterprises"between Shandong Province Commission Of Economy and Informatization,China IronSteel Research Institute Group("China Steel Institute"),and China Rare MetalsRare Earth Co.,Ltd("China Rare Earth"),the"Shandong Rare Earth Group"jointly set up by the 3 units thus broke surface.On August 9,reporters of the China Economic Herald learned from Shandong Province     

Aluminium Production by Province or City in 2014

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