Binderless tungsten carbide articles come in a variety of different types. They can be used for anything from abrasive waterjet mixing tubes to EDM guides to flow control devices and waste water treatment blocks. Other uses include hardfacing pellets and guide rolls for wire drawing.
WC-Co cemented carbides
Cemented carbides are widely used in a wide range of applications, from industrial grinding wheels to precision instrumentation parts. WC-Co is the most commonly used type of cemented carbide. The WC-Co structure is well known for its high hardness and wear resistance. This article will discuss different types of WC-Co cemented carbides, as well as different binders and sintering methods.
WC-Co cemented carbide is prepared using a three-step process. First, starting powders are weighed and put into cemented carbide jars. The powders are then mixed in a high-energy planetary ball mill. After mixing, the powders are dried at 120 degrees C in a drying oven.
Y 2 O 3
Binderless tungsten carbide is a type of metal that has the ability to be sintered and shaped into many shapes. The binderless carbide is made from tungsten carbide with Y 2 O 3 added to it. This type of metal has a relatively high Vickers hardness value and is extremely dense. It is also very hard, with a fracture toughness of 10 MPa.
Oxidation of binderless tungsten carbide results in the formation of two distinct layers that have different oxidation properties. One type, the YG3 cemented carbide, is resistant to oxidation, while the other is susceptible to oxidation. Binderless tungsten carbide is oxidized by the presence of Y 2 O 3. It exhibits a parabolic weight gain curve, which is a characteristic of oxidation.
Binderless tungsten carbide is a compound that is used in applications that require high hardness and wear resistance. These applications include pump seals, dies, and cutting tools. Tungsten carbide is usually mixed with binder metals to improve toughness and wear resistance. Binder metals usually constitute 2 to 30 percent of the total weight of cemented tungsten carbide.
A mixture of tungsten carbide and other materials is mixed to create a powder with an average grain size of about 0.8 mm to 1.1 mm. Vanadium carbide and chromium carbide are added to the tungsten carbide powder to inhibit the growth of grain crystals. A powder that contains the two additives typically has a hardness of at least 2,900 kg/mm2.
Chromium carbide binderless spherical tungsten carbide was developed and tested using the same conditions as in Example 1. This new material contains a concentration of ditungsten carbide of about 6%. The addition of vanadium carbide and chromium carbide reduced the grain size to 0.3 microns. The resulting material was examined for its wear resistance by measuring the erosion rate.
Chromium carbide binderless spherical tungsten carbide can be made from two-phase sintering methods. The first step involves grinding the tungsten carbide powder to an average particle size of about 0.2 microns. The powder is then added to a pressing binder, such as paraffin. The next step is milling the resulting powder to a desired grain size.
Vanadium binderless tungsten carbide is a highly resistant material. It has a cubic structure and is usually composed of one or more carbides of vanadium and chromium. The vanadium content in the material is typically about one to ten percent by weight. This alloy also has a low cobalt content.
The hardness of the material is largely dependent on the amount of additives that are used in the binder phase. These additives may include B4C or VC, which may lead to significant brittleness. In addition, the combination of boron and vanadium may cause the phase to be super hard.
The presence of B4C in the tungsten carbide layer can affect the microstructure of the material. It reduces the grain size. The composition of the material is dependent on the concentration of B4C and the degree of stress applied to it.