What role does a kejia vacuum furnace play in diamond brazing?
The role of vacuum furnace in diamond brazing mainly includes the following aspects:
1. Prevent oxidation and pollution
- **Isolate air**: In a vacuum environment, there is almost no oxygen, which can effectively prevent diamond and brazing alloy from being oxidized during high-temperature brazing. Oxidation will cause the performance of diamond and brazing alloy to deteriorate, affecting the welding quality and the performance of diamond tools. For example, after the diamond surface is oxidized, its hardness and wear resistance will decrease; the oxidation of brazing alloy will cause poor fluidity and reduced wettability, making it difficult to form a good welded joint.
- **Exclude impurity pollution**: Vacuum conditions can exclude impurities such as dust and water vapor in the air to prevent them from mixing into the brazing process, thereby ensuring the purity of the welded joint and improving the strength and reliability of the weld. The presence of impurities may form defects at the welded joint and reduce the mechanical properties of the joint.
2. Promote the wetting and diffusion of brazing alloy
- **Enhance wettability**: The vacuum environment reduces the barrier effect of gas on the brazing alloy, making it easier for the brazing alloy to spread and wet on the diamond surface. Good wettability is the key to forming high-quality welded joints, which helps the brazing filler metal to fully fill the gap between the diamond and the matrix, and improve the density and bonding strength of the weld.
- **Promote atomic diffusion**: Under vacuum and high temperature conditions, the diffusion rate of atoms is accelerated, and the metal atoms in the brazing filler metal and the carbon atoms on the diamond surface and the metal atoms in the matrix are more likely to diffuse with each other, forming a strong chemical bond and metallurgical bond. This metallurgical bond makes the connection between the diamond and the matrix stronger, and improves the service life and performance of the diamond tool.
3. Reduce welding residual stress
- **Uniform heating**: The vacuum furnace can provide a uniform heating environment, so that the diamond and the matrix are heated evenly during the brazing process, reducing the thermal stress caused by uneven temperature. Thermal stress can cause defects such as deformation and cracking of the welded joint, reducing the quality of the weld.
- **Slow cooling**: During the cooling process of the vacuum furnace after brazing, the cooling rate can be controlled to slowly cool down the diamond and the matrix, thereby reducing the residual stress generated during the cooling process. The reduction of residual stress helps to improve the strength and toughness of the welded joint and enhance the reliability of the diamond tool.
4. Achieve precise temperature control
- **Temperature uniformity**: The vacuum furnace is equipped with an advanced temperature control system that can accurately control the temperature in the furnace and ensure the uniformity of the temperature throughout the furnace. Precise temperature control is essential for diamond brazing, because different brazing materials and diamond materials have their specific brazing temperature ranges, and only at the right temperature can a good welding effect be achieved.
- **Temperature stability**: Temperature stability can ensure the consistency of the brazing process and avoid the instability of the melting and solidification process of the brazing material due to temperature fluctuations, which affects the quality of the welded joint.
5. Suitable for brazing of a variety of diamond tools
- **Different types and sizes**: Whether it is different types of diamond tools such as diamond cutters, drill bits, grinding wheels, or diamond abrasives of various shapes and sizes, the vacuum furnace can provide suitable brazing conditions to meet the production needs of different diamond tools.
- **Welding of complex structures**: For some diamond tools with complex structures, such as multi-layer diamond tools or diamond parts with special shapes, the vacuum furnace can achieve brazing of these complex structures while ensuring welding quality.
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