金属零件的激光直接成形研究

着重介绍了金属零件激光直接成形的技术特点、系统组成及初步研究结果。采用激光来熔化同步供给的金属粉末，可实现复杂形状零件的直接制造，零件组织致密、细小均匀，该工艺技术具有广阔的发展前景。     

Development in Conducting Bus of RE-Al Alloys

Four kinds of deformed aluminum alloys were tested. One kind of RE-A1-Mg-Si alloy, which possessed high conductivity and strength, was the first priority by contrast test, The large specification bus of conducting aluminum all oys was made by thermomechanical process during the industrial experiment. The properties of the bus are as follows:the tensile strength σb is 238 MPa, the conductivity (v.s. IACS) is 54.3%, and the current-carrying capacity is beyond 3.1kA during working process. This kind of RE-Al alloy bus has been applied to several electrical transmitting and transforming work.     

激光快速成型不锈钢零件的研究

采用激光快速成型先进技术制造出316L不锈钢薄壁金属零件。研究结果表明,所成型零件的组织致密,组织特征为枝晶组织并且化学成分分布均匀。同时,金属薄壁零件的力学性能与常规加工方法制造的零件的力学性能相当,表明激光快速成型的金属零件可满足实际使用要求。     

Colloidal Alumina-bonded TiB2 Coating on Cathode Carbon Blocks in Aluminum Cells

Self-propagating high-temperature synthesis (SHS) with reduction process was used to fabricate TiB2 powder from TiO2-B2O3-Mg system. The colloidal alumina-bonded TiB2 paste was prepared and coated on the cathode carbonblocks. Various properties of the baked paste such as the corrosive resistance, thermal expansion and wettability were tested. Experimental results showed that the colloidal alumina-bonded TiB2 coating could be well wetted by liquid alum inum; and the thermal expansion coefficient of the coated material was 5.8× 10 6 ℃ -1 at 20-1000℃, which was close to that of the traditional anthracite block cathode (4× 10 6 ℃ 1); the electrical resistivity was 8 μΩ·m at 900℃ when the con tent of alumina in the coated material was about 9% in mass fraction. In addition, some other good results such as sodium resistance were also reported.     

水平连铸Al-Sn板坯制造铝钢轴瓦

在自行设计研制的水平连铸机上进行了Al Sn合金板坯水平连铸工艺参数的选择 ,分析了水平连铸板坯的结晶特点及其出现纵裂的原因 ,成功地水平连铸出合格的厚 15mm×宽 150mm规格的Al Sn合金板坯 ,并且还成功地进行了该铝合金板坯与钢带的轧制复合制造铝钢轴瓦的试验。     

扫描速度对激光快速成型316L不锈钢组织性能的影响

研究了在激光功率900W条件下，扫描速度对激光快速成型不锈钢零件组织，性能的影响，在各扫描速度下，所成型的不锈钢薄壁板件的组织均为枝晶组织，随扫描速度提高，不锈钢薄壁板的定向生长树枝晶组织细化，枝晶间距变小，同时其沿X方向的机械性能（抗拉强度及硬度）降低。     

Al/B4C复合粉末激光多层熔覆的研究

采用激光熔化同步输送的Al/B_4C复合粉末,在45#钢基体上制得Al/B_4C多层熔覆层,其组织致密均匀,B_4C颗粒大部分已分解,有两种针状相生成并均匀分布在铝基体上,经分析可知是Al_4C_3及AlB_(12)C_2。熔覆层具有较高的硬度。     

激光快速成形技术制备Al/SiC复合材料工艺参数研究

激光快速成形技术制备Al/SiC复合材料在工艺上存在许多难点，这是由Al/SiC复合粉末的特性及激光加工的特点所决定的。具体的工艺参数包括基体材料的选择及处理、激光功率、扫描速度、送粉量、载气量等。其变化均可以影响最终的成形质量。本文通过大量的试验，总结了工艺参数对Al/SiC复合材料激光快速成形过程的影响，并得出普遍适用的规律，对进一步的工作有重要的指导意义。     

工艺参数对激光快速成型316L不锈钢组织性能的影响

采用激光快速成型技术制备了316L不锈钢零件,研究了激光功率对激光快速成型不锈钢零件组织、性能的影响。研究结果表明,激光功率≤900W条件下,所成型的不锈钢薄壁墙的组织为枝晶组织,当激光功率升高到1150W时,枝晶组织变得更短。机械性能测试结果显示,在各激光功率下制备的不锈钢薄壁墙的机械性能均可满足实际使用要求。     

激光直接堆积成形铜合金的组织及性能

基于快速成型原理,采用激光熔化同轴输送的铜合金粉末,在沉积基板上直接制备出 具有一定复杂外形的零件。零件组织致密,成分均匀,力学性能较铸态有所提高,能满足直接使用的性能要求。