Surface Hardening of High-Strength Low Alloy Steels (HSLA) Dual-Phase Steels by Ball Burnishing Using Factorial Design

Burnishing is used increasingly as a finishing operation which gives additional advantages such as increased hardness, fatigue strength, and wear resistance. Experimental work based on 3⁴ factorial design was carried out to establish the effects of ball burnishing parameters on the surface hardness of high-strength low alloy steels (HSLA) dual-phase (DP) steel specimens. Statistical analysis of the results shows that the speed, feed, lubricant and ball diameter have significant effect on surface hardness.     

室温离子注氢CeO2的微结构及价态研究

利用高分辨透射电子显微镜(HRTEM)及电子能量损失谱(EELS)对室温下注入氢离子的CeO2烧结体的显微组织结构和价态进行了原位观察和分析。结果表明：室温注氢，虽可以使严重损伤区内氧的状态发生明显改变，却不能引起CeO2的相转变及Ce的价态改变；这一结果可能与氢离子因尺寸太小不能占据CeO2的正常格点位置从而无法有效形成氧空位以及室温下CeO2中Ce和O的扩散比较困难等因素有关。     

The interfacial microstructure of joined single crystal and polycrystalline alumina

The interfacial microstructures of 96 and 98% polycrystalline alumina joined with single crystal sapphire have been investigated in relation to the joining parameters. Joining has been evaluated based on either using a thin spin-on silica interlayer or by placing the alumina and sapphire in direct contact. The materials were joined by placing the coated or uncoated surfaces in contact and heating in the range of 1340–1475 °C with minimum external load. With the aid of a silica interlayer, sapphire and 98% polycrystalline alumina were successfully joined in 180 min at 1400 °C and above, while samples without a silica interlayer failed to join under these conditions. However, sapphire and 96% polycrystalline alumina were joined both with and without the use of silica interlayer. A variety of interfacial morphologies have been observed, including amorphous regions, fine crystalline alumina, and intimate contact between the sapphire and polycrystalline alumina.     

型煤发展的回顾与展望

煤炭科学研究总院建院以来型煤研究工作的进展状况、主要成果,并对几项工业型煤技术进行了概述和评价,还对今后型煤研究方向提出了建议。     

大断面交岔点失稳分析及治理

通过工程地质调查、室内围岩物化分析和力学试验 ,深入研究了围岩变形力学机制和破坏机理 .根据新奥法施工原理 ,采取了有针对性的综合治理措施 ,将围岩复杂的变形力学机制转化为单一的变形力学机制 ,使该工程得到了有效治理 .取得的技术经验推广应用于该矿井其它失稳破坏工程 ,均获得了圆满成功     

某含砷浮选金精矿的细菌氧化预处理-氰化提金试验研究

云南省某含砷难浸金精矿，常规氰化金浸出率仅为26．17％，通过采用细菌氧化预处理后，金浸出率达到98．25％，获得了非常理想的试验指标。     

微波热液法制备光催化TiO2功能材料

采用微波加热法，研究了钛配离子热分解水解反应的规律。结果表明，水解产物在大气气氛和300℃下煅烧2h，所得产物为锐钛型TiO2粉末。在紫外线照射下，乙酸经Ti02光催化反应12h后，残余量小于初始量的20％。     

铁水脱硫扒渣是包钢发展的重要环节

脱硫扒渣站的建成,既解放了炼铁厂的高炉,又减轻了炼钢厂转炉冶炼的负担,同时可以实现铁水预脱硫→顶底复吹转炉炼钢→钢水二次精炼→连铸这一炼钢四位一体的现代化生产工艺流程,从而生产有市场竞争力的产品.镁基脱硫剂是世界上冶金企业采用最先进的脱硫剂,脱硫技术和设备也是世界上最先进的.     

低碳钢热浸Zn-0.15%Ni合金镀层组织及第二相粒子

采用热浸Zn-Ni合金镀锌方法，在含0.03%-0.36%Si的低碳钢上获得Zn-Ni合金镀层，研究了镀浴中Ni含量和钢中Si含量对镀层中δ相和ζ相生长速率的影响，以及Zn-Ni合金镀层η相中的第二相粒子即Zn-Fe-Ni三元化合物Γ2相粒子的形成和长大过程，结果表明，在Zn-0.15%Ni镀浴中，含硅0.03%-0.215%钢镀层的ζ相明显受到抑制，δ相厚度略有增加，Γ2相粒子的形成和长大过程包括ζ相的溶解，Γ2相的形核和成比例吸收铁，镍而长大。     

光激励和光检测微型硅谐振器研究

分析了光激励谐振器振动的检测问题，用调制激光束激励谐振器使其发生振动，并采用光学干涉的方法测量了这种微振动。