Home >>Binderless Tungsten Carbide

Introduction

Conventional tungsten carbide is a very important tool material composed of WC hard phase and Y-Co binder phase. It has high strength, high hardness, high modulus of elasticity, wear resistance, corrosion resistance and low thermal expansion coefficient. And high chemical stability and other characteristics, widely used as tools, drilling tools, wear parts and so on. The strength and toughness of WC-Co tungsten carbide increase with the increase of Co content, but the increase of Co content also reduces the wear resistance and corrosion resistance of tungsten carbide. Therefore, in some special occasions, such as those requiring high hardness, high wear resistance and high corrosion resistance, the traditional WC-Co tungsten carbide can not meet the requirements, so the research of the new unbonded phase hard alloy has become The inevitable development trend.

Binderless tungsten carbide refers to a class of high wear-resistant WC hard alloys containing less than 0.5% by mass of Co., which has higher hardness, wear resistance and resistance than traditional WC-Co tungsten carbide. Corrosive and superior polishing characteristics, while reducing the cost of raw materials, and reducing the impact of Co6tl radioactivity on the human body and the environment. Since the ordinary particle size WC powder cannot produce a higher density bulk by the conventional sintering method when the Co content is extremely low, the ultrafine WC powder can not only obtain an alloy of nearly full dense structure but also the hardness, strength and toughness of the material. Will be greatly improved, so the unbonded phase ultra-fine tungsten carbide becomes an important research direction of tungsten carbide.

Advantages

Ultra-fine grained WC-Co tungsten carbide meets the ever-increasing requirements for high-performance carbide tool materials due to its high hardness, high flexural strength, high wear resistance and high toughness. The low-Co superfine-grained tungsten carbide has higher hardness, red hardness and wear resistance than conventional ultrafine-grained tungsten carbide, and is used in precision machinery, special wear-resistant materials, processing tools and parts, drawing dies, etc. Have a more unique advantage. In addition, the unbonded phase WC tungsten carbide has excellent wear resistance and corrosion resistance, excellent polishing and oxidation resistance of WC-Co alloy, and has broad application prospects.

Properties Table

Density(g/cm3)	Hardness(HV)	T.R.S.(MPa)		Toughness(MPa/m2)		Specific Heat(J/mol.K)
>15.4	>2600	>830		5.9		35.4
Thermal Conductivity	Thermal Expansion		Resistivity		Corrosion Resistance
120(W/m.K)	4.5x10-6/℃		17x10-6ohm.cm		H2NO3,HCL,H2SO4,HF,Alkali

 

 

 

 

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