What is the reason for the blackening of the diamond segment?

The blackening of the diamond segment is mainly divided into two categories. The first category is the blackening of the segment before use, and the second is the blackening of the segment after use. The following will explain in detail according to different situations.
The segment turns black before it is used. the main reasons are as follows:
1: The sintering temperature of the segment is too high, mainly due to the fact that during the hot pressing sintering process of the diamond segment, the metal powder begins to undergo transitional sintering due to the high temperature, and the metal atoms are more tightly combined with atoms, and the density is higher, and the oxidation reaction is more intense. Generally speaking, under the combination of high-speed metal atoms and high density, it is very normal for the metal bond of the segment to turn black under such high temperature conditions.

For diamond, when the diamond is at a high temperature of 700 degrees Celsius, carbonization will occur on the surface of the diamond. The result of carbonization is graphitization on the surface of the diamond, and the surface will turn black.

Both powder and diamond will turn black at high temperature, but as long as the temperature does not exceed a certain limit, then such a temperature can make the diamond and powder bond more closely, and sometimes the segment will show better wear resistance , life will be longer.

2: The blackening of the segment may also be caused by the black metal in the segment, and the high proportion of the metal. The black metal includes manganese and chromium, which are common metal elements in the modern diamond segment formula table. If the content of this metal is too much, it will form manganese steel and chromium steel with metal iron, and the color of such steel will turn black. Among them, it has some properties of manganese steel, the machinability is stronger, and the rigidity of the material is also more prominent.

3: If the segment is left for too long, the surface will be severely oxidized and the segment will turn black. Generally speaking, the oxidation degree of the segment is related to the air humidity. But under normal circumstances, the surface of the segment will be oxidized after 1-2 years, and the color of the diamond segment will become darker as time goes by.

The second category is that the diamond segment turns black after use, which is mainly caused by the following reasons:
1: The segment is melted, mainly due to some bad situations when the diamond saw blade is cutting the stone, such as insufficient cooling water, too fast saw blade speed, and too high hardness of the stone.

2: After the diamond segment is cut, due to lack of maintenance, it is placed in a humid environment for a long time, and the surface will gradually become rusty and black, especially for the iron-based segment, which is especially obvious.
3: Insufficient sharpness of the segment will cause the segment to fail to cut the stone and the saw blade to slip during the cutting process. As time goes by, some segments turn black, mainly because the segment can’t cut the stone.

Generally speaking, in the process of cutting stone, the diamond segment will often turn black. The main reason is that the segment is not used and maintained correctly, or the purchased segment itself has some problems caused by. Choosing a suitable segment and operating according to the requirements and specifications can greatly avoid this problem.