First: Definition and classification of cemented Carbide

（1）DEFINITION: Cemented Carbide is a series of alloys with high hardness and wears resistance, mainly composed of tungsten carbide of the 4th, 5th, and 6th Group Metals in the periodic system.

（2）CLASSIFICATION: Cemented Carbide production is a very complex, detailed, and multi-process process. From the concentrate, metal oxides (the primary material) obtained through a series of complicated chemical processes.

In the further physical and chemical reactions, the properties and forms of the elements change a lot. So there are many kinds of cemented Carbide, mainly used to prepare various tools and wear-resistant parts. Newly cemented carbides fall into five broad categories.

 

1. WC-CO, WC-TIC-CO, WC-TIC-TAC NBC-CO, WC-Ni, and other Tungsten Carbide (such as Cr3C2) based on WC-CO. This kind of alloy has many brands, large output, and full application.

2. Titanium carbide, including tic-mo-ni. TIC-WC-TAC NBC-MO-NI and other systems. These alloys have high hardness and mainly used for steel finishing and superfinishing.

3. COATED CEMENTED CARBIDE: This is a layer of TIC, TIN, or their composites and A12O3 deposited on the first-class cemented carbide blade, which improves the durability of the blade.

4. Steel Bonded Cemented Carbide: This type of alloy is bonded to steel and cemented Carbide to tic. WC. It characterized by heat treatment.

The purpose is to manufacture wear-resistant parts, corrosion-resistant parts, and some special tools.

5. Other hard alloys: such as carbide-based hard alloy, carbide carbide carbide, titanium carbide alumina hard alloy and so on. They have their characteristics and are in the process of development.

Second: The position and function of cemented Carbide in the national economy

Without industry, there would be no consolidated national defense, no welfare of the people, and no prosperity of the country. Cemented Carbide is an indispensable tool and material for the modern industry.

Without it, the manufacturing, manufacturing, mining, oil drilling, and defense industries would not have developed. According to recent industry statistics, 10,000 tons of steel requires a ton of cemented carbide processing.

There is hardly any industrial sector that does not require cemented Carbide, which is mainly used to make:

A. Cutting tool

B. Die

C. Wear-resisting parts

D. High-temperature components

E. For the defense industry

1. Cemented Carbide is mainly used to manufacture metal cutting tools. In recent years, due to the promotion of high-speed cutting technology, many metal processing plants are equipped with cemented carbide tools.

The reason why cemented Carbide widely used in metal cutting tools is that it keeps quite hard under high temperatures. The hardness of YT30 alloy at 800 °C is about RC 65, which is equivalent to that of high-speed steel at room temperature. At the same temperature, the hardness of p 18 HSS has decreased to about RC 20.

The hardness of YT15 and YG6 alloys at 750 is equivalent to that of P18 HSS at room temperature.

2. Cemented Carbide dies second only to the applications of metalworking tools. Cemented Carbide wire drawing can replace expensive diamond dies in many cases.

The service life of cemented carbide stamping die is often several times longer than that of alloy steel die, and the product can keep accurate size and shape for a long time.

3. Mining tools: High hardness and wear resistance, but also requires high strength and impact resistance.

4. Wear-resistant parts cemented Carbide can be used to make lathe and grinder centers.

5. High-temperature applications are the latest applications of cemented carbides. This alloy mainly consists of titanium carbide, which has the characteristics of small specific gravity, high thermal conductivity, high resistance to temperature change, high-temperature strength, and excellent resistance to corrosion and oxidation.

6. In National Defense Industry, the aviation industry has been widely used, but also a large number of bullets for tank weapons and naval armor-piercing bullets.

Third: a history of cemented carbide development

 

The history of cemented Carbide is, in essence, a history of the application of tool materials in metal processing and mining and drilling industries.

Because of the development of production, high-efficiency tool materials urgently needed. It leads to complex changes in the composition of the tool material.

In 1907, stellite type alloy appeared, and in 1914, cast Tungsten Carbide seemed, which can not meet the needs of the rapid development of the mechanical industry.

In 1927, Cermet Cemented Carbide introduced. With the development of alloy, various kinds of alloy have developed rapidly. In 1931, tungsten-cobalt-titanium cemented Carbide appeared, which increased the metal cutting speed by more than ten times. It is a real revolution in the processing industry.