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Graphite products for diamond sintering molds mainly include: sintered graphite combination molds for diamond grinding wheels, sintered graphite molds for diamond drum grinders, high-purity and high-density graphite molds for straightening teeth, molds for shaped graphite parts, sintered graphite molds for diamond straight cutterheads, sintering trays, sintering racks, etc.
The requirements for graphite in diamond sintering molds include high purity, proper density and compressive strength, fine grain structure and low porosity, uniform resistivity, and good oxidation resistance. Together, these requirements ensure the stability of the diamond sintering process and the high quality of the workpiece.
Graphite should be as pure as possible, generally requiring at least 99.9%. This is because impurities may react with the mixed metal particles, resulting in the formation of scars on the surface of the workpiece and affecting the quality of the workpiece. High purity graphite ensures the stability of the sintering process and the high quality of the workpiece.
The bulk density of graphite molds should be at least 1.75g/cm³ or more, and the compressive strength is above 70Mpa. This is because graphite plays a supporting role as a mold under high temperature and high pressure, if the density is too low or the compressive strength is insufficient, the mold is easy to break in use. High density and high compressive strength graphite mold can provide better support and wear resistance to ensure the smooth sintering process.
The particle structure of graphite should be fine and uniform, generally no more than 25μm, and the open porosity should be less than 13%. Fine particle structure can ensure that the mold surface flatness and precision, while low porosity can reduce the possibility of mixed metal particles absorbed by the graphite, so as to maintain a stable ratio of metal and diamond in the workpiece.
The graphite material should be uniform and the resistivity should be basically the same everywhere. This is because if the resistance between the blocks is different, it will lead to different heat generation, which makes the temperature difference is large, affecting the structural homogeneity of the sintered material. Uniform resistivity can ensure that the mold heats up evenly during the sintering process, improving the hardness and fracture resistance of the workpiece.
Graphite molds should have good antioxidant performance to resist oxidative corrosion at high temperatures. This can be realized by adding antioxidants, controlling the antioxidant impregnation process and other methods. Good antioxidant properties can prolong the service life of the mold and improve the sintering efficiency.
Sintering is a traditional process to transform the powdery material into a compact body through heat and pressure without melting to the point of liquefaction. This process involves the atoms in materials diffusing across the particle boundaries and fusing together into one piece. Sintering occurs naturally in mineral deposits, and is used as a manufacturing process for materials including ceramics, metals and plastics.
Because the sintering temperature doesn't reach the materials' melting point, it is often used for materials with high melting points, such as molybdenum and tungsten.
Powder raw material is loaded in graphite molds to be sintered or hot pressed. It actually is a heat treatment process where loose material is subjected to high temperature and pressure in order to compact it into a solid piece.
High strength graphite for pressure sintering
Our graphite is very widely used in pressure sintering processes.
Graphite sintering moulds are used to produce diamond or ceramic cutting tools.
Our customers appreciate the excellent performance characteristics of our graphite in these high-temperature processes.
The combination of exceptional thermal conductivity and a low coefficient of thermal expansion is an essential element to ensure the dimensional stability of sintering moulds.
Factory Supply High Quality Graphite Mold for Sintering Diamond Tools
Graphite sintering moulds, also known as graphite moulds, are essential tools used in the manufacturing industry for various sintering processes. Sintering is a process of compacting and forming a solid mass of material using heat and pressure without melting it completely. Graphite moulds play a crucial role in this process, and their unique properties make them highly suitable for a wide range of applications. Here are some common uses for graphite sintering moulds:
Powder Metallurgy:
Graphite sintering moulds are extensively used in the powder metallurgy industry to create metal and ceramic parts. In this process, metal or ceramic powders are compressed into a desired shape and then sintered in a graphite mould. The graphite mould provides the necessary support and shape retention during the sintering process, resulting in high-quality and precise components with excellent mechanical properties.
Diamond Tool Manufacturing:
Graphite sintering moulds are widely used in the manufacturing of diamond tools, such as diamond saw blades, diamond saw segment, diamond grinding wheels, diamond drill bits and diamond core drills. The diamond grit is mixed with a metal or alloy powder and pressed into the graphite mould. The mould is then subjected to high temperatures and pressure, allowing the diamond and metal powders to sinter together, forming a strong bond.
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