共查询到18条相似文献,搜索用时 125 毫秒
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<正> 本试验的目的在于制定合理的蓝钨生产及其掺杂工艺,确定掺杂蓝钨经一步氢还原制取钨丝用钨粉的新工艺制度。试验证明,蓝钨工艺比国内通用的黄钨工艺先进合理,不但可以节省工序、人力, 相似文献
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掺杂钨丝生产工艺的改进研究 总被引:2,自引:1,他引:1
刘光耀 《稀有金属与硬质合金》1997,(2):26-29
分析了常规工艺所生产掺杂钨丝存在的缺陷,通过采取优化工艺过程的具体措施,制取了既具有优良高温抗下垂能力,又具有良好的加工、绕丝性能的掺杂钨丝,可满足双螺旋抗震灯丝的需要。 相似文献
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叙述了抗震钨丝的掺杂机理和制备工艺,指出只有掺入K、Si和Al,才能获得良好的抗震性能。文章还介绍了国内外生产现状,并对抗震钨丝的发展方向提出了新的见解。 相似文献
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<正> 掺杂钨条的密度对于制作灯泡用钨丝的生产具有至关重要的作用,因此获取适宜密度的掺杂钨条,对于生产具有必要的强度、延性、韧性和抗下垂性等综合性能优异的钨丝是有重要意义的。下面将生产过程中影响掺杂钨条密度的几个主要因素略述如下:一、掺杂元素的影响我厂生产的灯泡用钨丝的各项性能是通过在 WO_3中掺杂少量的硅、铝、钾的化合物来达到的。实践证明:硅和铝在烧结时几 相似文献
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掺杂钨丝基础研究和质量评价技术的突破性进展 总被引:1,自引:0,他引:1
以控制和提高掺杂钨丝的性能为目的,研究了影响掺杂钨丝质量的微观结构本质和提高性能的机理,介绍了掺杂钨丝的质量评价在线监控技术,为制订掺杂钨丝的生产工艺和进行质量控提供了理论依据。 相似文献
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对用极细掺杂钨粉(2.5~5.0μm)等静压成型长径比30左右的圆钨条工艺进行了研究 ,解决了圆钨条难成型、坯条弯曲、不圆、直径不均匀 ,脱模难等五大技术问题 ;分析了新老两种工艺生产的钨坯在烧结加工过程中对组织结构和性能的影响。找出了钨丝劈裂脆断的原因。为了使该工艺用于工业生产 ,还研制了金属粉末自动装料机 ,提高了生产效率和装粉质量 相似文献
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采用扫描电镜、透射电镜等手段,研究了氧化钨的微观结构.结果表明,不同氧化钨——紫钨、蓝钨、黄钨具有不同的微观结构,其中紫钨具有独特的单晶棒状结构,适合生产细颗粒钨粉. 相似文献
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Scandia doped tungsten powders were prepared by spray drying combined with two-step hydrogen reduction.The particle size of doped tungsten powder,powder morphology and doped tungsten matrix were characterized by scanning electron microscope,X-ray diffrac-tion and laser diffraction particle size analyzer,respectively.The reduction behavior of Sc2O3 doped tungsten oxide and the effect of Sc2O3 on the property of tungsten powder were studied by the temperature programmed reduction.The experimental results showed that the pre-cursor powders prepared by spray drying had spherical shape.The addition of Sc2O3 could decrease the reduction temperature of tungsten oxide.The scandia doped tungsten powder had sub-micrometer size in the range of 0.1 to1 μm and scandium distributed evenly in the powder.By using this kind powder,sub-microstructure cathode matrices with semispherical grains and homogenous distribution of scan-dium were obtained. 相似文献
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Scandia and rhenium doped tungsten powders were prepared by solid-liquid doping combined with two-step reduction method. The particle size of doped tungsten and distribution of scandia and rhenium were studied by SEM, EDS, XRD and granularity analysis. Experimental results showed that scandia distributed evenly on the surface of tungsten particles. Addition of scandia and rhenium decreased the particle size of doped tungsten, and the more the content of scandia and rhenium, the smaller the doped tungsten particles. Tungsten powders doped with 3 % Sc2O3 and 3 % Re (mass fraction) had an average size of about 80 nm in diameter. The mechanism of the decrease in the tungsten particle size was discussed. 相似文献