"Metal Materials" Metal and Metal Materials PPT Courseware 5

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"Metal Materials" Metal and Metal Materials PPT Courseware 5

Bronze Age

The Simuwu Ding is the heaviest bronze ware discovered so far in China. The production scale and technical level of the bronze casting industry in the Shang Dynasty.

The Qinling bronze chariots and horses are made strictly according to 1/2 of the real chariots and horses. Many experts and scholars call it the "Crown of Bronze".

Several common metals

Copper and iron are the earliest metals used by humans. my country made bronze wares during the Shang Dynasty, and smelted iron and steel during the Spring and Autumn Period and the Warring States Period. The use of aluminum is much later than copper and iron, although it was more than 100 years ago. However, due to aluminum's low density and excellent corrosion resistance, the annual output of aluminum in the world has now surpassed copper, ranking second after iron.

Our lives are closely related to metals. Fill in the blanks:

In daily life, the silver-white metal used on the inner wall of household thermos bottles is _____, and the metal filled in thermometers is ______.

The upper part of the household iron spatula is often added with a wooden handle or a plastic handle, which shows that iron has ______ properties. Iron can be drawn into wire, which shows that iron has ______ properties.

Questions and Exploration

A large number of aluminum alloys are used in the materials used to manufacture aircraft. Why not use pure aluminum?

1. Alloy

It is a substance with metallic characteristics formed by heating and fusing certain metals or non-metals in metal.

Note: Not all alloys are metals, there may be non-metals among the elements that make up the alloy; an alloy is a mixture rather than a compound.

Discussion and inspiration

Solder is an alloy of tin and lead, mainly used for welding metals; Wude alloy is an alloy of bismuth, lead, tin and cadmium, which can be used to make circuit fuses, etc. What insights can you draw from the information in the table below?

Conclusion: Alloys vs. Pure Metals

Greater hardness Lower melting point

Higher strength (good toughness, resistance to stretching, bending, and pressure)

Better corrosion resistance

Therefore, although there are only more than 90 kinds of pure metals that have been produced by mankind, there are thousands of alloys produced by people according to certain compositions and mass ratios of these pure metals for various purposes.

Consolidate and improve:

1. The metal material used to make wires is generally ( )

A.Iron B.Copper C.Silver D.Magnesium

2. Which two substances in each of the following groups are mixtures ( )

A.Steel stainless steel B.Copper bronze C.Iron pig iron D.Tin solder

3. Which of the following statements about alloys is correct ( )

A. The alloy lacks metallic luster B. There are only more than 90 types of alloys

C. Alloys are compounds D. Many properties of alloys are superior to those of pure metals

4. Which of the following descriptions of the properties of metals is correct ( )

A. Metals are solid at room temperature B. The melting points of metals are relatively low

C. Most metals are excellent conductors of electricity and heat. D. Metals lack ductility.

5. Titanium and titanium alloys are important metal materials in the 21st century. They have excellent properties, such as high melting point, low density, good plasticity, good mechanical properties, strong corrosion resistance, and good compatibility between titanium alloys and the human body. ". Based on their main performance, impractical uses are ( )

A. Used to make fuses B. Used to make aerospace equipment

C. Used in the manufacture of nuclear submarine equipment D. Can be used to make artificial bones

6. What properties do the metal materials used to mint coins need to have?

After studying this topic you should know

1. Metals share many physical properties. For example, they are all solid (except mercury) at room temperature, have a metallic luster, and most are excellent conductors of electricity and heat. They are ductile, have a high density, and have a high melting point.

2. The properties of a substance largely determine its use, but it is not the only determining factor. When considering the use of materials, you also need to consider many factors such as price, resources, whether it is beautiful, whether it is convenient to use, whether the waste materials are easy to recycle, and how it affects the environment.

3. Metal materials include iron, aluminum, copper and other pure metals and alloys. Alloys made by heating and fusing certain metals or nonmetals into metals change their properties. Alloys are generally stronger and harder than the pure metals they are composed of, and have better corrosion resistance. Therefore, alloys have a wider range of uses.

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Update Time: 2024-12-03

This template belongs to Chemistry courseware People's Education Press Ninth Grade Chemistry Volume 2 industry PPT template

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