空气流雾化铝硅共晶合金粉末钎料的粒度分布

对空气雾化制备的A1-Si共晶合金粉末钎料粒度分布进行了研究，结果表明，粉末钎料粒度分布呈双峰曲线，主要分布在105～246μm之间．运用二次破碎机理对颗粒分布特征进行了分析，并推导出液滴发生二次破碎极限尺寸的计算公式．     

气雾化制备Al-Si钎料粉末的研究

针对铝/不锈钢大面积钎焊对钎料的特殊要求,采用气雾化法制备了Al-Si共晶合金钎料粉末,并对雾化金属熔体质量流率、雾化气体压力及雾化温度等影响雾化效果的主要因素进行了研究.结果表明,在金属液流直径dt=5 mm,雾化气体压力P=1.0 MPa,雾化温度720～770℃的条件下,可制备出75～350μm粉末的质量分数达90%以上的钎料,其各项性能指标均达到法国同类产品的水平.     

气雾化制备Al-Si钎料粉末的研究

针对铝/不锈钢大面积钎焊对钎料的特殊要求,采用气雾化法制备了Al-Si共晶合金钎料粉末,并对雾化金属熔体质量流率、雾化气体压力及雾化温度等影响雾化效果的主要因素进行了研究.结果表明,在金属液流直径dt=5 mm,雾化气体压力P=1.0 MPa,雾化温度720～770℃的条件下,可制备出75～350μm粉末的质量分数达90%以上的钎料,其各项性能指标均达到法国同类产品的水平.     

一种焊膏用铝基钎料粉末的制备

采用真空熔炼、惰性气体雾化的工艺生产焊膏用铝基钎料（AS-1）粉末.在雾化压力1.2 MPa、熔液流量3.0 kg/min和熔液温度780℃的工艺条件下,所制备的钎料粉末粒度小于0.15 mm的质量分数大于85%,其中0.045~0.15 mm粉末占成品粉质量分数90%以上,粉末呈球形.所制备的钎料粉末达到了铝焊膏用钎料的性能.     

一种焊膏用铝基钎料粉末的制备

采用真空熔炼、惰性气体雾化的工艺生产焊膏用铝基钎料(AS-1)粉末.在雾化压力1.2 MPa、熔液流量3.0 kg/min和熔液温度780℃的工艺条件下,所制备的钎料粉末粒度小于0.15 mm的质量分数大于85%,其中0.045～0.15 mm粉末占成品粉质量分数90%以上,粉末呈球形.所制备的钎料粉末达到了铝焊膏用钎料的性能.     

金锡合金钎料研究现状

介绍AuSn20合金钎料的性能和制备方法。分析传统铸造拉拨轧制法、叠层冷轧复合法、电镀沉积法以及金锡钎料焊接工艺技术的利与弊及改进情况。     

金锡合金钎料研究现状

介绍AuSn20合金钎料的性能和制备方法.分析传统铸造拉拨轧制法、叠层冷轧复合法、电镀沉积法以及金锡钎料焊接工艺技术的利与弊及改进情况.     

过共晶铝硅合金铸锭初晶硅偏析原因分析

采用化学成分分析、金相组织分析、扫描电镜断口观察等方法分析某过共晶铝硅合金铸锭的初晶硅偏析原因。结果表明,铝锭中存在分布不均匀的初晶硅,尺寸达到100μm,材料的含氢量及氧化膜含量较高,铝锭中孔洞和疏松缺陷较多,应优化熔炼过程的保护和除气工序,熔体冷却速度较低及过热温度过高或保温时间较长,是初晶硅偏析的原因。     

粉状铝基钎料的钎焊性能研究

介绍了粉状铝基钎料的制备方法,探讨了以粉状铝基钎料为焊料,钎焊铝材的工艺性能,从表面张力的角度出发,讨论了粉末粒度对铝材钎焊工艺和性能的影响,结果表明:采用粒度在150～180 μm的粉状铝基钎料钎焊铝材,其焊件的剪切强度较高;采用粒度大于300,μm的粗钎料或粒度小于150 μm的细钎料钎焊铝材,其剪切强度较低,粉状...     

Al-Si共晶合金微粉熔化的研究

Al-Si共晶合金微粉宜采用坩埚式中频感应加热炉熔化.Al-Si共晶合金熔化时的熔化熵为16.05 J/mol.K,其体积变化与组元间合金元素Al-Si的体积变化不具有加和性.微粉压成块、炉內留有起熔体以及快速升温均有助于提高微粉熔化后的合金回收率.Al-Si共晶合金微粉在大气气氛下经熔化后凝固的合金,其氧含量升高、Si含量降低.     

Al-Si共晶合金微粉熔化的研究

Al-Si共晶合金微粉宜采用坩埚式中频感应加热炉熔化.Al-Si共晶合金熔化时的熔化熵为16.05 J/mol*K,其体积变化与组元间合金元素Al-Si的体积变化不具有加和性.微粉压成块、炉內留有起熔体以及快速升温均有助于提高微粉熔化后的合金回收率.Al-Si共晶合金微粉在大气气氛下经熔化后凝固的合金,其氧含量升高、Si含量降低.     

气雾化法制备3D打印用钴铬合金粉末工艺的研究

采用真空熔炼气雾化工艺制备3D打印用钴铬合金粉末,通过调整雾化工艺参数,研究了漏嘴直径、熔炼温度及雾化压力对粉末形貌、粒度分布、松装密度及流动性等特性的影响.结果表明:在熔炼温度为1670℃、雾化压力为5 MPa、漏嘴直径为5 mm的条件下,制备的合金粉末性能优异,平均粒径(D50)为30.70μm,松装密度为4.30g/cm~3,氧含量为0.032%,流动性为22.40s/(50g),可满足3D打印用钴铬金属粉末的性能要求.     

Temperature dependence of the liquid eutectic lead-lithium alloy density

Lead-lithium alloys are of great interest for practice as the advanced materials to be used in new technique, nuclear energetics, and so forth. Terefore, study on the physico-chemical properties of the latter is of major significance. An analysis of the available literature shows that there are a few works, devoted to study of Pb-Li alloys densities. However, temperature dependence of the density ρ(T), and its temperature coefficientK=dρ/dT for eutectic alloy were obtained by either extrapolation of the density data up to the eutectic alloy''s composition, or calculation method. There is a certain discrepancy amounting to as high as 4,, while the allowable error in the density measurements is less than 0.5,. The discrepancy between the results for the temperature coefficients of density amounts to 80,.In this work we present the experimental data on the temperature dependence of Ph0.83 Li0.17 eutectic alloy''s density in the temperature range 520K to 643 K. The alloys were prepared using Pb and Li with 99. 999, and 99.8, contents of the basic elements, respectively. We use the improved device, which permits to get the results with error less than 0. 15,. The results of 115 measurements of density in 520K to 643K temperature range were processed by the least-square method. Density polytherm of Pb0.83 Li0. 17 eutectic alloy is described by linear equation ρ(T) =9507.89-0. 79813(T-508) , kg/m3 ,where T is the absolute temperature by K. Mearsurement error was 0. 12, at 95, reliability.Discrepancy in the temperature coefficient data was 1.08,.Thus, the temperature dependence of the Pb-Li eutectic alloy density was studied by the precise two-capillary method. The obtained results may be recommended as the most reliable reference data.     

Temperature dependence of the liquid eutectic lead-lithium alloy density

Lead-lithium alloys are of great interest for practice as the advanced materials to be used in new technique, nuclear energetics, and so forth. Terefore, study on the physico-chemical properties of the latter is of major significance. An analysis of the available literature shows that there are a few works, devoted to study of Pb-Li alloys densities. However, temperature dependence of the density ρ(T), and its temperature coefficientK=dρ/dT for eutectic alloy were obtained by either extrapolation of the density data up to the eutectic alloy‘s composition, or calculation method. There is a certain discrepancy amounting to as high as 4%, while the allowable error in the density measurements is less than 0.5%. The discrepancy between the results for the temperature coefficients of density amounts to 80%.In this work we present the experimental data on the temperature dependence of Ph0.83 Li0.17 eutectic alloy‘s density in the temperature range 520K to 643 K. The alloys were prepared using Pb and Li with 99. 999% and 99.8% contents of the basic elements, respectively. We use the improved device, which permits to get the results with error less than 0. 15%. The results of 115 measurements of density in 520K to 643K temperature range were processed by the least-square method. Density polytherm of Pb0.83 Li0. 17 eutectic alloy is described by linear equation ρ(T) =9507.89-0. 79813(T-508) , kg/m3 ,where T is the absolute temperature by K. Mearsurement error was 0. 12% at 95% reliability.Discrepancy in the temperature coefficient data was 1.08%.Thus, the temperature dependence of the Pb-Li eutectic alloy density was studied by the precise two-capillary method. The obtained results may be recommended as the most reliable reference data.     

双中频感应加热在雾化金属制粉设备中的应用

通过对感应电流方向、感应加热频率、感应圈距离等影响因素的分析,以及测量距感应圈不同位置的铁圈温度的模拟方法,来判断感应圈之间的相互影响．研究结果表明;当两个感应圈相距12cm以上以及采用不同中频感应电源频率时,两中频电源相互间影响可忽略．在雾化制粉设备中采用中频感应加热的方法加热熔炼炉和中间包的设计是可行的．