Intduction to Materials Modte4 Metallic Materials PDF文件使用"pdfFactory Pro'”试用版本创建wm,fineprint.com,cn
Introduction to Materials Module 4 Metallic Materials PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn
History of Metals .Copper,gold and silver are believed to be the first metals known to man because they exist in nature in the metallic state. Copper pieces dating back to 4000-3000 B.C.have been discovered. Early metal objects were made by hammering or beating the naturally occurring metal to the desired shape PDF文件使用"pdfFactory Pro”试用版本创建ww,fineprint..com,cn
History of Metals •Copper, gold and silver are believed to be the first metals known to man because they exist in nature in the metallic state. •Copper pieces dating back to 4000-3000 B.C. have been discovered. • Early metal objects were made by hammering or beating the naturally occurring metal to the desired shape PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn
Death Mask of Tutankhamen PDF文件使用"pdfFactory Pro'”试用版本创建wm,fineprint.com,cn
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Copper .Copper melts at 1083C and a wood fire has a maximum temperature of 600C. .A charcoal fire is needed to melt copper. -Copper absorbs a lot of gas and therefore when cast it forms a lots of holes or porosity. .Pure copper is also very soft. PDF文件使用"pdfFactory Pro”试用版本创建ww,fineprint..com,cn
Copper •Copper melts at 1083oC and a wood fire has a maximum temperature of 600oC. •A charcoal fire is needed to melt copper. •Copper absorbs a lot of gas and therefore when cast it forms a lots of holes or porosity. •Pure copper is also very soft. PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn
Bronze Age .Bronze is a copper-tin alloy .The Bronze Age dates from 3600-1400 B.C. .The Egyptians made bronze objects by a technique called investment casting. .Bronze is much harder and stronger than pure copper. .Bronze does not form much porosity when cast. PDF文件使用"pdfFactory Pro'”试用版本创建wm,fineprint.com,cn
Bronze Age •Bronze is a copper-tin alloy. •The Bronze Age dates from 3600-1400 B.C. •The Egyptians made bronze objects by a technique called investment casting. •Bronze is much harder and stronger than pure copper. •Bronze does not form much porosity when cast. PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn