Reasons for the slow technological progress, is subject to the Warring States machining tools without prior conditions. If the tin content of more than 10%, and its machining performance will be getting worse. So far, the highest national standards of bronze only 10% of the tin content. Ancient bronze mirror because sufficient copper tin, which makes the alloy structure close to the image than the effect of copper greatly improved. Form the supporting role to the protagonist, the bronze sculpture has walked a long way. As we all know, is a rough cross-section of copper, from copper cross-section can be seen, the thick crystal structure, the same as corn dregs; Figure 3 with 24% of high tin bronze outlet cross-section, which is showing a smooth and delicate silver-white, glistened with irregular-shaped cross-section of the ice pattern.
Riga ancient copper alloy tin china bronze sculpture mirror the main purpose is to reduce the melting point and lower pouring temperature and improve bronze mirror image effect. Low melting point alloy, the ease of melting; Tao Fan of raw materials for the soil, the main chemical composition of silica, the softening point of 1100 ℃, if the casting temperature of copper in the numerical solution, was to soften the environment, Fan surface of the mud appears to be sintering phenomena, cast out of bronze mirror blank can not afford to glue a layer of surface soil; the incorporation of about 24% of the tin after pouring temperature down to about 850 ℃, the temperature range surface of the softening point of a certain distance, you can avoid the Tao Fan is sintered alloy, copper. The rapid development of the bronze statue is owning to the development of society.
Bronze mirror which can guarantee the rough-cast surface finish, especially the need to ensure that the rough bronze mirror finish back decoration. The best proof is that people’s ideas change along with the chinese bronze. Ancient bronze mirror on the back of copper decoration smaller, and some even the slightest details, such as in cast out of the rough decoration, is not the grinding, if pure copper bronze mirror, when the pouring temperature of molten copper in 1200 at least ℃; ancient Tao Fan is rammed earth system, most of the earth for the place, not in high-temperature clay; general chemical composition of the soil is mainly SiO2, the sintering temperature is generally 1100 ℃ -1200 ℃, therefore, copper Fan surface liquid is easy to sintering, the cast bronze mirror blank after sintering a layer of glue firmly in the scope of soil, resulting in blurred bronze mirror back decoration, ornamentation will be cast after the processing of worn beyond recognition; if technically reach a certain rough-cast finish, casting is equivalent to waste.
Therefore, the amount of tin added, drop-point of the pouring temperature, pouring when the copper solution to solve the surface problem of sintering range, making cast after cast more easily between the rough and Tao Fan from the open. But the main purpose is to improve the image effect. The china bronze help us to recognize the nature and their own strength. When the alloy in the tin content of 24% or so, the image effect like glass, bronze mirror today, fully meet the daily requirements of the use of technology. The lower the amount of tin, bronze mirror, the easier it yellow; such as tin content is too high, one is not easy due to a large degree of processing brittle alloy, then the price of tin is much larger than for copper, more than 24% or more is a waste.
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