Changzhou too good to be universal tool for everyone today Carbide Tool Features:

Carbide Tool Features
Carbide welding blade
Carbide welding blade
High hardness (86 ~ 93HRA, equivalent to 69 ~ 81HRC);
Good hot hardness (up to 900 ~ 1000 ℃, holding 60HRC);
Good wear resistance.
Carbide Tool 4-7 times higher than high-speed steel cutting speed, tool life is 5 to 80 times higher. Manufacture of molds, measuring 20 to 150 times, higher than the life expectancy alloy tool steel. You can cut about 50HRC hard material.
But brittle carbide, can not be cutting, difficult to make complex shapes of a solid tool, and therefore often made of different shapes of blades, welding, bonding, mechanical clamping, and other methods to install the tool body or mold on the specific use .
Material properties
Carbide is a high hardness of refractory metal carbides (WC, TiC) micron powder based
Carbide Tool
Carbide cutting tools essential component, cobalt (Co) or nickel (Ni), molybdenum (Mo) as binder, sintered in a vacuum furnace or hydrogen reduction furnace powder metallurgy products.
IVB, Group VB, Group ⅥB metal carbides, nitrides, borides and the like, particularly due to the high hardness and melting point, collectively referred to as cemented carbide. Below carbide focus to illustrate the hard gold-bearing structures, features and applications.
IVB, Group VB, Group ⅥB metal carbides with carbon in the metal, due to the small radius of carbon atoms, can fill the voids in the metal lattice and retain the original metal lattice form, interstitial solid solution. Under appropriate conditions, such solid solutions can continue to dissolve its constituent elements, until saturated. Thus, their composition may be varied (e.g., the composition of titanium carbide on the variation between TiC0.5 ~ TiC) within a certain range, the formula does not comply with the rules of valence. When the dissolved carbon content exceeds a certain limit (eg titanium carbide Ti︰C = 1︰1), the lattice pattern will change, so that the original metal lattice into another form of the metal lattice, when the mesenchymal solid solution, called mesenchymal compounds.
Metal carbides, especially ⅣB, ⅤB, ⅥB Metal Carbide melting point in the above 3273K, wherein the hafnium carbide, tantalum carbide, 4160K and 4150K, respectively, are currently known substance highest melting point. Most carbide great hardness, their hardness greater than 1800kg · mm2 (microhardness hardness is one of representation, used for carbide and hard compound, hardness 1800kg · mm2 corresponds to a Mohs a diamond hardness 9). Many carbides at high temperatures is not easy to break down, a strong antioxidant capacity than its metal component. Titanium carbide carbide in all the best thermal stability is a very important metal carbides. However, in an oxidizing atmosphere at high temperature for all carbides are easily oxidized, it can be said that this is a major weakness of carbides.
Addition to carbon atoms, a nitrogen atom, a boron atom can enter the gap in the metal lattice, interstitial solid solution. They carbide with properties similar to the gap, electrically conductive, thermal conductivity, high melting point, hardness, and brittleness is also large.
Cemented carbide substrate consists of two parts: one is the hardening phase; the other part is a bonded metal.
Hardening carbide phase is a transition metal in the periodic table, such as tungsten carbide, titanium carbide, tantalum, their high hardness, melting points above 2000 ℃, and some even more than 4000 ℃. In addition, transition metal nitrides, borides, silicides have similar properties, it can also serve as the cemented carbide hardening phase. It determines the presence of the hardening phase alloy having a high hardness and wear resistance.
Carbide Tool
Carbide Tool
Carbide of tungsten carbide WC grain size according to the requirements of different uses of different particle size WC (WC). Carbide cutting tool: for example, cut foot blades, V-CUT knives, and other finishing alloy ultra-fine, sub-fine, fine particles of WC, roughing alloy particles using the WC, alloy gravity cutting and heavy cutting use, the crude WC particles as raw material; mining tools: high rock hardness, impact load, coarse particle WC, rock small impact shock loads using small particles in WC raw material; wear parts: when stressed its wear resistance, compressive strength and surface finish , the use of ultra-fine, sub-fine, fine, WC particles as raw material, impact resistant tool use, the coarse particles of WC-based raw materials.
WC theoretical carbon content of 6.128% (at 50%), WC carbon content when the carbon content by theory, the free carbon (WC + C) WC appear. The presence of free carbon, and when grew up around the sintered WC grain, resulting in non-uniform grain carbide. WC General requirements combined carbon high (≥6.07%), free carbon (≤0.05%), total carbon is determined by the production process and the use of carbide range.
Under normal circumstances, paraffin vacuum sintering process is mainly determined by WC total carbon compounds in the sintered compact before the oxygen content within. To add an oxygen-containing 0.75 parts of carbon, ie WC = 6.13% total carbon + oxygen% × 0.75 (assume a neutral atmosphere sintering furnace, vacuum furnace is in fact the majority of carburizing atmosphere, the use of less than the calculated total carbon WC value).
Currently the total carbon content of WC is roughly divided into three types: paraffin vacuum sintering process with WC total carbon is about 6.18 ± 0.03% (free carbon will increase). Paraffin hydrogen sintering process with total carbon content of WC was 6.13 ± 0.03%. Rubber hydrogen sintering process with WC total carbon = 5.90 ± 0.03%. The above process sometimes cross, so make sure WC total carbon depending on the circumstances.
Different scope, different Co (cobalt) content, different grain size of the alloy used WC total carbon can do some minor adjustments. Low-cobalt alloy can be used high total carbon tungsten carbide, high cobalt alloys can choose low total carbon tungsten carbide. In short, the specific needs of different carbide tungsten carbide particle size requirements are also different.
Binder metal usually iron group metals, cobalt and nickel are commonly used.
When producing cemented carbide, selection of raw materials powder size between 1 and 2 microns and a high purity. The composition ratio of raw materials required ingredients, add alcohol or other medium wet milled in a wet ball mill, and they were sufficiently mixed, pulverized, dried and sieved added wax or other similar plastic molding agent, and then dried, too sieve obtained mixture. Then, the mixture granulation, compression type, heated to near the melting point bonding metal (1300 ~ 1500 ℃) when the hardening phase bonding metal eutectic alloy is formed. After cooling, the hardening phase distribution in a grid of bonding metal composition, the closely linked to each other to form a solid whole. Depending on the hardness of cemented carbide hardening phase content and grain size, ie, the higher the hardening phase content, the finer the grain, the hardness is greater. Carbide toughness is determined by the metal bonding, bonding metal content is higher, the greater the flexural strength.

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