英国曼彻斯特大学化学Essay代写:什么是青铜? 定义,组成和属性

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青铜器的起源
青铜时代是青铜是广泛使用的最硬金属时期的名称。这是公元前四千年关于近东苏美尔市的时间。中国和印度的青铜时代几乎同时发生。即使在青铜器时代,也有一些由陨石铁制成的物品,但铁的冶炼并不常见。青铜器时代之后是铁器时代,从公元前1300年左右开始。即使在铁器时代,青铜也被广泛使用。

青铜器的用途
青铜用于结构和设计元素的建筑,由于其摩擦性能用于轴承,在乐器,电触点和船用螺旋桨中用作磷青铜。铝青铜用于制造机床和一些轴承。在木工中使用青铜色羊毛代替钢丝绒,因为它不会使橡木变色。青铜已被用来制作硬币。大多数“铜”硬币实际上是青铜,由含4%锡和1%锌的铜组成。青铜器自古以来就被用来制作雕塑。亚述王Sennacherib(公元前706-681)声称是第一个使用两件式模具铸造巨大青铜雕塑的人,尽管在此之前很久就使用了失蜡方法来铸造雕塑。

英国曼彻斯特大学化学Essay代写:什么是青铜? 定义,组成和属性

Origin of Bronze
The Bronze Age is the name given to the time period when bronze was the hardest metal that was widely used. This was the 4th millennium BC about the time of the city of Sumer in the Near East. The bronze age in China and India occurred at roughly the same time. Even during the Bronze Age, there were a few items crafted from meteoritic iron, but the smelting of iron was uncommon. The Bronze Age was followed by the Iron Age, starting around 1300 BC. Even during the Iron Age, bronze was widely used.

Uses of Bronze
Bronze is used in architecture for structural and design elements, for bearings because of its friction properties, and as phosphor bronze in musical instruments, electrical contacts, and ship propellers. Aluminum bronze is used to make machine tools and some bearings. Bronze wool is used instead of steel wool in woodworking because it doesn’t discolor oak. Bronze has been used to make coins. Most “copper” coins are actually bronze, consisting of copper with 4% tin and 1% zinc. Bronze has been used since ancient times to make sculptures. The Assyrian king Sennacherib (706-681 BC) claimed to be the first person to cast huge bronze sculptures using two-part molds, although the lost-wax method was used to cast sculptures long before this time.

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