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The advantages and disadvantages of metal materials

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The advantages and disadvantages of metal materials
college chemistry examination questions

metal materials:

Introduction: & nbsp; Metal materials refer to metal elements or materials with metal characteristics mainly composed of metal elements. Including pure metals, alloys, metal materials, intermetallic compounds and special metal materials. (Note: metal oxides do not belong to metal materials)

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classification: (1) ferrous metals, also known as iron and steel materials, include industrial pure iron with iron content of more than 90%, cast iron with carbon content of 2% ~ 4%, carbon steel with carbon content of less than 2%, as well as structural steel, stainless steel, heat resistant steel, superalloy, precision alloy, etc. for various purposes. Ferrous metals in a broad sense also include chromium, manganese and their alloys

& nbsp; & nbsp; & nbsp; & nbsp; & nbsp; (2) Nonferrous Metals refer to all metals and their alloys except iron, chromium and manganese. They are usually divided into light metals, heavy metals, precious metals, semi metals, rare metals and rare earth metals. Nonferrous alloys generally have higher strength and hardness than pure metals, high resistance and low resistance temperature coefficient

& nbsp; & nbsp; & nbsp; & nbsp; & nbsp; (3) Special metal materials include structural metal materials and functional metal materials for different purposes. There are amorphous metal materials obtained by rapid condensation process, quasicrystal, microcrystalline and nanocrystalline metal materials, etc; There are also special functional alloys such as stealth, hydrogen resistance, superconductivity, shape memory, wear resistance, vibration damping and metal matrix composites

advantages: (1) good heat resistance and not easy to burn

& nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; (2) The properties change little with the change of temperature
& nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; (3) High mechanical strength
& nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; (4) Good durability, not easy to aging
& nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; (5) It is not easy to be damaged or contaminated with dust and dirt
& nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; (6) Good dimensional stability

metal material has high strength, good surface quality and strong corrosion resistance
but its weight is large, which is better than transportation and movement

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