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[Chemical Knowledge]：What is the unit of hardness?

Read： 337 Time：18months ago Source：Transform the World with Simplicity

What is the unit of hardness? This is a very common question, especially when it comes to fields such as materials science, geology, and metal processing. In simple terms, hardness is a characteristic that describes the ability of a substance to resist deformation and fracture. The unit of hardness varies from substance to substance. Let's explore what the units of hardness are and the significance of these units in different materials. One of the most common units of hardness for

is Rockwell (Rockwell hardness), which is a unit of measure used to evaluate the hardness of metallic materials. The principle is to measure the depth produced by a standard needle on the surface of a substance. The commonly used Rockwell hardness tester includes three types of Rockwell A, B and C. The test principle of each type is not much different, but the standard needle used and the test force are different. Rockwell hardness testing is often used to determine the surface hardness and depth of metals, as well as to determine the hardness rating of metallic materials.

In addition to Rockwell hardness, there are some other hardness units, the most well-known of which is Brinell hardness (Brinell hardness), which is a method to measure the hardness of a substance by applying a certain load to test the diameter of the imprint produced by the interface. In addition, there are Vickers hardness (Vickers hardness) and Knoop hardness (Knoop hardness).

Vickers hardness was invented by British physicist George Vickers in 1920 and is mainly used to measure the hardness of metals and ceramics. Unlike Rockwell and Brinell hardness, Vickers hardness uses a diamond indenter similar to a drill bit to produce small bumps, and then measures the area of the resulting bumps. This hardness test method has the characteristics of high precision, reliability and repeatability, and can be applied to different shapes and sizes of hardness materials.

Knoop hardness is another micro hardness test method, mainly used to measure the hardness of metal, non-metal and ceramic materials. The Knoop hardness test is extremely accurate and repeatable because it measures the length of the small pits or marks made by the drill on the surface of the material. The advantage of this method is that the non-uniformity of the material and the difference of the lattice structure can not be considered when testing the hardness value.

In general, hardness is a very important indicator in materials science and engineering, which involves the physical and chemical properties of materials. Different materials have different hardness units, but their test methods and principles are basically similar. Whether you are doing metal engineering, geological research or materials analysis, it is essential to understand the meaning and measurement methods of hardness units.

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