Speaking of graphite, many people think of diamond, which is also true, because graphite and diamond are homomorphic. Although they have the same "quality", their "shape" or "nature" are different. In terms of hardness, they are vastly different. Diamond is the highest hardness at present, while graphite is the softest. Why do you say that?

First of all, it can be seen from the new uses of graphite products that they are the softest, such as flexible graphite products. Flexible graphite, also known as expanded graphite, is a new graphite product developed in the s. What is the hardness of graphite products? In fact, this depends on the impurities doped in the graphite products? It is also determined by the amount of weight. However, it is known that the hardness of graphite is 1-2. If nothing is doped, the hardness of graphite products produced is certainly the same, in the range of 1 to 2. However, such graphite products are not resistant to falling and are easy to break, so we often think of some ways to increase the strength of graphite products, as follows:

The first is that the hardness can be increased to 3-5 with the increase of impurities in the vertical direction. The specific gravity is 1.9 ~ 2.3.

Second: if graphite products are made from graphite powder, binders need to be added. Binders include various resins and asphalt. 100 ~ 200 ℃ is not a high temperature for the preparation of carbon and graphite products, but you can only use resin to prepare at this temperature. Graphite powder and resin are kneaded and shaped, and then "high temperature" solidifies into graphite products, but the strength will not be very high. In general, graphite products are prepared not directly with graphite powder, but with a variety of coke, such as asphalt coke and petroleum coke. The graphite products prepared in this way have high strength.

The third kind: the strength of graphite is strengthened with the increase of temperature. At 2000 ℃, the strength of graphite is doubled.