hårdmetall

Hårdmetall is a sintered composite material, primarily composed of a hard carbide compound mixed with a binder metal. The most common type of hardmetall uses tungsten carbide (WC) as the hard phase, bound together by cobalt (Co). Other carbides, such as titanium carbide (TiC) and tantalum carbide (TaC), can be added to modify the properties. The binder metal can also vary, with nickel (Ni) sometimes used, particularly for applications requiring corrosion resistance.

The production process involves mixing fine powders of the carbide and binder metal, followed by pressing the mixture into the desired shape. This green compact is then sintered at high temperatures in a vacuum or controlled atmosphere. During sintering, the binder metal melts and infiltrates the carbide particles, forming a dense, solid material upon cooling.

Hårdmetall possesses exceptional hardness, wear resistance, and compressive strength, while exhibiting relatively low tensile strength and ductility. These properties make it ideal for applications involving cutting, drilling, forming, and abrasion. It is widely used in the manufacturing industry for tools such as cutting inserts, drill bits, milling cutters, and wear parts in machinery. It also finds use in mining, construction, and even in consumer goods like watch casings and pen tips. The specific composition and grain size of the hardmetall can be tailored to achieve different performance characteristics for various applications.