利用Ca（NO3）2-P2O5乙醇溶液体系制备纳米羟基磷灰石

使用Ca（NO3）2-P2O5乙醇溶液体系制备纳米羟基磷灰石，研究了在该体系中水浴温度、煅烧温度、陈化时间等因素对粉体的相成分，粒度和结晶度的影响。结果表明：水浴温度低，合成的粉体粒度小（约20nm），颗粒均匀且具有良好的分散性，但是结晶度较低；陈化后导致粉体粒度变大，结晶度增加；随着煅烧温度的升高，粉体的结晶度增加，600℃时可以得到结晶高的单一的羟基磷灰石粉体。在800℃煅烧时，羟基磷灰石发生部分分解。     

BNi—2钎焊条的真空吸铸工艺

研究了ＢＮｉ－２钎焊条真空吸铸原理，并由试验得出：当ＢＮｉ－２合金加热到１５００℃，真空控制阀门开口为φ６ｍｍ以上，真空度５０ｋＰａ，铸型预热温度５００℃，并用φ内２ｍｍ×５００ｍｍ石英管进行真空吸铸时，吸铸高度可达到４０ｃｍ以上。     

硅钢片"以冷代热"是大势所趋

概述了硅钢片的生产历史、冷轧硅钢片的优点和国家“以冷代热”的政策，并对目前硅钢片“以冷代热”仍存在的困难进行了分析。     

添加Dy和Dy2O3的烧结NdFeB系永磁体的显微结构与磁硬化

研究了(Nd_(1-x)Dy_x)_(16)Fe_(77.2)B_(6.8)和Nd_(16)Fe_(77.2)B_(6.8)+ywt-% Dy_2O_3磁体的磁性能、显微结构和磁硬化,在冶炼时添加Dy,Dy原子进入基体相,使其H_A提高,并细化晶粒和改善边界结构,提高磁体的矫顽力H_c,在制粉时添加Dy_2O_3,Dy原子进入基体相晶粒的外延展,使其K_1~2提高,同样细化晶粒和改善边界结构,并减少外延层厚度,提高磁体的矫顽力H_(ci),添加约2—3Wt—%的Dy_2O_3可制造出高H_(ci)高磁能积(BH)_m的NdFeB系烧结永磁材料。     

In-plane anisotropy of 1545 aluminum alloy sheet

1　INTRODUCTIONThe in plane anisotropy of mechanical proper ties brings the limitation to the use of alloy sheet.At the same time, during the material processing,the difficulties of contour machining will also be in creased. For this reason, when designing high performance aluminum alloy sheets, the in planeanisotropy is an important performance parameterthat must be considered. Studies have shown thatminor Sc and Zr in the Al Mg Mn alloy can refinegrains of cast ingot, inhib…     

提高金属摩擦学性能的新型润滑剂研究

从改善润滑性能出发,研制了一种在基础油中添加纳米碳酸钙粒子,用以提高金属摩擦学性能的新型润滑剂。通过X射线光电子能谱法得出:含有纳米碳酸钙粒子的润滑油,在摩擦过程中通过碳酸钙、氧化钙、钙三种物质共同作用提高金属的摩擦学性能。     

Effect of surface free energy of ceramic glaze on oil droplet shape and its behavior in water

A super-hydrophilic functional ceramic was prepared by adjusting the chemical components of ceramic glaze. Effect of surface flee energy of ceramic glaze on oil droplet shape and its behavior in water were studied. The results show that water can spread on ceramic surface with high surface free energy, and oil droplet can aggregate rapidly and separate from the ceramic surface in water. For the ceramic with lower surface free energy, the polar shares are dependant on its easy-cleaning property. The higher the polar shares, the better the easy-cleaning property, and the easier the droplet separates from the ceramic surface in water.     

200kA预焙槽强化电流过程中发生电解质粘度增加的实践探讨

通过分析200kA预焙槽在强化电流条件下电解质粘度增大的原因及对电解生产的影响,提出了规范电解生产作业制度及处理电解质粘度过大的建议,以实现降低工人劳动强度,达到工艺参数优化和提高电流效率的目的。     

Stress corrosion behavior of pipeline steel(X52)welded joint

The resistance of pipeline steel joint welded by submerged arc welding to stress corrosion cracking (SCC) at its different regions in boiling mixed nitrate solution and in H_2S saturated solution at room temperature is examined by the constant-load tension method. The result shows that when tested in nitrate, the weld metal may be the weakest link of the joint if the welding material doesn't match well. The resistance to SCC of the joint in H_2S is very low, especially at the bond and coarse grain zone and is closely dependent on the metallurgical quality of base metal.