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首页> 外文期刊>ISIJ international >Thermographical Analysis of Continuing Tradition of Mirror Casting in Kerala
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Thermographical Analysis of Continuing Tradition of Mirror Casting in Kerala

机译：喀拉拉邦镜面铸造延续传统的热成像分析

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Additions of large amounts of tin to copper lead to high tin bronzes with interesting combination of properties. Such high tin bronzes need to be carefully processed to avoid brittleness in compositions corresponding to beta and delta phases. The latter has been used in China, India, Korea and Japan to produce distortion free mirror images.This investigation is concerned with the bronze mirror from India where the tradition has survived in the village Aranmula in Kerala. The alloy has an exceptionally high tin content consisting almost entirely of the delta phase, which is an intermetallic compound (Cu_(31)Sn_(8)) of composition 32.6% tin. This is an ideal alloy to be polished into a mirror due to the silvery white color and high hardness. Its high brittleness is offset by an ingenious casting and polishing process.In addition to studying the composition and the casting involving a mould cum crucible method, thermographic analysis has been employed to follow the solidification sequence by looking at the thermal profile. It is correlated with the actual composition, processing parameters and the resultant microstructure, due to the cooling rate the alloy solidifies with a mild departure from the equilibrium phase diagram. Some observations regarding the structure of the delta phase which is a Hume-Rothery phase will be provided about its optical and mechanical properties.
机译：在铜中添加大量锡会形成具有有趣特征的高锡青铜。需要小心处理这种高锡青铜，以避免与β和δ相相对应的成分变脆。后者已在中国，印度，韩国和日本用于产生无畸变的镜象。这项调查与印度的青铜镜有关，该传统在喀拉拉邦的Aranmula村得以幸存。该合金具有极高的锡含量，几乎完全由δ相组成，这是一种成分为32.6％锡的金属间化合物（Cu_（31）Sn_（8））。由于银白色和高硬度，这是一种理想的合金，可以抛光成镜子。它的高脆性被巧妙的铸造和抛光工艺所抵消。除了研究组成和铸件涉及铸模和坩埚方法外，热成像分析还被用于通过观察热曲线来跟踪固化顺序。它与实际的成分，工艺参数和所得的微观结构有关，这归因于冷却速度，合金的凝固速度与平衡相图略有偏离。将提供关于休phase-罗西相的δ相的结构的一些观察结果，有关其光学和机械性能。

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