The properties of cemented carbide powder metallurgy materials

Hard alloy is one kind or several kinds of refractory carbide powder as the main ingredient, adding cobalt powder bonding, prepared by powder metallurgy materials. The commonly used hard alloy according to the composition and performance characteristics: tungsten cobalt, tungsten cobalt titanium, tungsten titanium tantalum (NB) class.

(1) the performance of hard alloy

High hardness, hardness of up to 69-81HRC at room temperature. Hot hardness is high, up to 900-1000 DEG C. Good wear resistance, the cutting speed is 4-7 times higher than 5-80 times of high speed tool steel, tool life, hard material cutting around 50HRC. High compressive strength, but low flexural strength, poor toughness. The corrosion resistance and good oxidation resistance. Linear expansion coefficient is small, but poor thermal conductivity.

A general method for machining hard alloy material can not only use electric processing (e.g., EDM, wire cutting, grinding or electrolytic grinding etc.). Therefore, the general is the hard alloy products, brazing bonding or mechanical clamping using the knife body or the mold.

(2) classification and grouping code of hard alloy cutting

In accordance with the provisions of the GB2075-87, cutting with hard alloy according to the chip removal is a form and processing object range is divided into three categories of P, m, K, according to the different processing materials and suitable processing conditions, all kinds of hard alloy by use of grouping, the code in the main class don't code behind with a group of figures by, such as P01, M10, K20 and.

Introduction for Shenzhen MIM Injection Molding Carbide

About introduction for Shenzhen MIM injection molding carbide  :  since the early 1920s invented by a German scientist, with name "widia" (like diamond) on market, carbide achieved widely application in industries as the first production of tungsten tensile mould and replaced expensive diamond tensile mould. In recent years development situation, the researching and designing theory of MIM injection molding carbide became much deeper and more science, applied more widely.

In the development of new carbide materials, iron-nickel-generation drill was quite popular a few years ago. For example, Shenzhen carbide material institute developed high strength and toughness carbide alloy equaling to YG, YG20, YG25 , received good results for cold heading die and cold extrusion die. Shenzhen Carbide Institute also developed a carbide die material equaling to YG (15-20) by method iron-nickel-generation drill. For roll forging standard parts and cold heading steel ball, it respects same effect as YG20

In recent years, popular new researches are fine crystal, ultra-fine grain, even nanocrystal cemented carbide and gradient cemented carbide. Gradient cemented carbide divided into composition gradient, and organization structure gradient. In addition, it also uses molten metal infiltration process to produce gradient cemented carbide, such as gradient carbide anvil.

Fine-grained and ultrafine grain cemented carbide has also been available, such as when drawing <φ lmm wire, fine grain YGS drawing die is three times of the normal drawing mode. In addition, there are cast-inlaid carbide hot die, achieving good results in terms of rolling and wire rod rolling.