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本文论述了镍基自熔合金冶炼时的某些主要特点。并已证实,该类合金的元素烧损率低、自脱氧能力强,用不同比例的返回料熔炼的合金其性能变化不大。同时探讨了合金增硅的原因及反应。 相似文献
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随着消费群体年龄结构和销售模式的变化,低成色金合金逐渐成为K金首饰市场的一个新方向。该文以10K白色金合金为研究材料,采用铸造充填法、差热分析法、静水密度法、测色法、加速腐蚀法、高温氧化法、冷变形法等检测了试验合金的物理性能、化学性能及加工制作性能。试验结果表明:当合金中有41.7%~42%金、11%~14%镍、33%~36%铜、9%~13%锌、0.05%~0.3%硅、0.005%~0.05%硼时,其熔化温度变化范围在37℃以下,筛网充填率达到98%,有较好的铸造性能;合金的黄度指数低于19,达到1级白色,具有优良的抗硫化变色性能及抗高温氧化性能;合金的初始硬度较高,加工硬化速率适中,有利于进行冷加工生产和首饰表面耐磨损。 相似文献
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以镍为主粘结相,配以一定比例的微量合金元素(Co+Cr质量分数小于1.4%),通过合理调整合金成分,严格控制生产工艺,研制出一种高抗腐蚀、耐磨损的镍粘结相(6%)硬质合金.该合金与含钴6%(质量分数)的硬质合金在弱酸性试验环境下进行抗腐蚀、耐磨损性能对比试验.结果表明:镍粘结相合金的抗腐蚀耐磨损性比相同钴含量硬质合金的... 相似文献
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K红金以其独特的颜色成为近年来非常盛行的首饰材料。该合金以铜作为主要合金元素,而铜原子与金原子容易形成脆性的有序固溶体,使K红金首饰制作中常出现脆裂问题。影响K红金有序化转变的因素有合金成分、冷却方式、形变工艺等,通过合理设计K红金的成分配比,使K红金饰件在高温受热后快速冷却,在形变加工过程中采用正确热处理方法等途径,可以避免K红金发生脆裂问题。 相似文献
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K红金首饰颜色问题的探讨 总被引:2,自引:1,他引:1
K红金是以铜为主要合金元素的金合金材料,因呈现美丽的玫瑰红色而广受欢迎。K红金在生产和使用过程中常因颜色不够红、容易晦暗和变色等问题而引起异议。文中对K红金首饰的颜色评价方式进行了探讨,肉眼观察颜色具有较大的主观性,在批量生产时应制作标准色版进行比对,并利用分光光度计对合金的本体颜色和颜色差别进行量化检测。检验条件和样品的表面状态对颜色检测结果会造成影响,保持这些条件的一致性是使检验结果具有可比性的基础。K红金的颜色、抗晦暗和变色性能及加工性能与其成分关系密切,设计其成分时需要综合考虑颜色要求和加工性能要求。 相似文献
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TP Aufderheide I Rowlandson SW Lawrence EM Kuhn HP Selker 《Canadian Metallurgical Quarterly》1996,27(2):193-198
A broad range of nickel-containing alloys and coatings used in jewellery, watches and clothes, were patch tested in 100 nickel-sensitive subjects and in 20 nickel-negative controls. Three non-plated stainless-steel alloys tested caused no patch-test reaction. Nickel interliners under gold, silver or chromium plating, as well as nickel-silver and some white-gold alloys, caused positive patch-test reactions. Ear ornaments, wristwatches and buttons were the objects most frequently causing dermatitis. Half the nickel-sensitive participants suspected that they had been sensitized before the age of 20. The results of the study have been used as the basis for developing clinically relevant analytical methods for nickel release. The methods are proposed as European Standards and will be used in the Nickel Directive, an EC regulation aiming at the prevention of nickel allergy. 相似文献
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Nickel-containing stainless steels have been widely applied in watch and jewelry production,and their responses to the Nickel Directive become a universal concern in the industry.The nickel release rates and corrosion behaviors of types 316 L,304,303 and 201stainless steels under the conditions of solid solution and mirror polishing were studied by artificial sweat soaking and electrochemical methods.The results show that the weekly nickel release rates in artificial sweat do not strictly correspond to the nickel contents,which present a descending order as 303 stainless steel of 2.06μg/cm2,201 stainless steel of 1.51μg/cm2,304 stainless steel of 0.08μg/cm2 and 316 L stainless steel of 0.02μg/cm2.Both the nickel release rates of type 303 and 201stainless steels significantly exceed the threshold values regulated in EN1811∶2011;therefore,they should be avoided to be used as watch and jewelry materials owing to the risk of nickel sensitization.The nickel release rates of 316 Land 304stainless steels meet the requirements of the standard.Sulfide inclusions in stainless steel become the sources of pitting and exacerbate the damage of the passivation membrane,which is the significant cause to enhance the nickel release rates. 相似文献
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