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The control ratio of the metal content in the diamond segment bond
Publish Date:2020-08-17
So since these bonding agents can make the material bond stronger, do they need a lot of use? This is not the case. The bonding agent has a bonding effect, and a large amount of the bonding agent will cause the tool tip to flow. What if there is too little binder? Then there will be insufficient adhesion, insufficient wear resistance of the segment, and some metal powder in the carcass can play a role in fixing the diamond, which greatly improves the life of the segment. Below we talk about the role and dosage of the three commonly used metal binding agents.Nickel is a kind of metal powder commonly used in diamond segments. Nickel and iron elements are very good combination. They can form a stable and rust-proof metal material tightly, and nickel has good holding power and certain wear resistance to diamond In addition, the nickel material has both polishing properties, so it is often used in iron-based granite segments. However, the price of nickel powder is relatively expensive, so it should not be used in large quantities. Generally, it is controlled between 5% and 6%. The nickel content of the granite blade with better wear resistance can be adjusted to 8-9%, usually more than 10%, because the ingredients exceeding 10% will cause uneven sintering of the segment, and the quality problem of the deviation of the segment size. Of course, the combination of copper base and nickel commonly used in marble segments can also make the segment not easy to rust, so almost all manufacturers will add this metal element to the segment.
Tin and zinc are low-melting metals. The sintering temperature of the segment is generally around 800 degrees. At 730 degrees Celsius, tin and zinc are completely melted during the sintering process of the segment. The molten metal passes through the gap between the powder of the segment. Cast iron, nickel, copper, diamond, etc. play a bonding role. Generally speaking, the tin content in the segment will be too much. Zinc will start to oxidize at 225 degrees. During the cutting process, the oxidized zinc has a negative effect on the segment, so the tin content is controlled at about 8% Or the total content of tin + zinc is about 8%.
The metal bond must be consistent with the diamond wear rate. The advantage of this is that the diamond particles are continuously exposed to the working surface of the segment, so that the sharpness and processing efficiency of the saw blade can be better maintained. The strength of the bond is higher than that of diamond wear, so the segment has no cutting edge, and the segment will not be able to cut directly. Conversely, if the wear resistance of the bond is very low, then the diamond wear speed cannot keep up with the shedding speed, and it will become intolerant to cutting. Therefore, the amount of metal elements in the binder still depends on the actual cutting situation.
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