The Vickers hardness test method was proposed by r.l.smith and g.e.sandland in 1921. Vickers Armstrong company in England has developed a hardness tester by this method. Vickers hardness tester is a high-tech product of optical mechanical and electrical integration. The machine is novel in shape, with good reliability, operability and intuition. It is a new Vickers and nuop hardness testing instrument adopting precision mechanical technology and photoelectric technology.

Vickers hardness tester has a lot of test force, as long as the surface roughness of the workpiece meets the standard, Vickers hardness tester can detect. The Vickers hardness tester presses the surface of the workpiece through a stepping motor, and then the length of the diagonal of the indentation is measured by a reading microscope. Then Vickers hardness is measured by a conversion relationship between diagonal and test force. In addition, Vickers hardness measurement software can be installed to display the image through the computer display screen, which makes the operation of hardness measurement more convenient and fast.

purpose

Vickers hardness test is mainly used in material research and scientific test. It is mainly used to test the hardness of small precision parts, the hardness of surface hardening layer and effective hardening layer depth, the surface hardness of coating, the hardness of sheet material and thin wire material, the hardness near the blade, the hardness of dental materials, etc. Because the test force is very small and the indentation is also very small, the appearance and performance of the sample can not be affected. Micro Vickers hardness test is mainly used in the study of metallography and metallography, to determine the hardness of each phase in metal structure, to study the brittleness of refractory compounds, etc. Micro Vickers hardness test is also used to test very small or very thin parts, the thickness of parts can be as thin as 3 μ m。

It is widely used to measure the microhardness of small, thin specimens, surface coating and other specimens, and to measure the Knoop hardness of brittle and hard materials such as glass, ceramics, agate and artificial gemstones. It is an ideal hardness testing instrument for scientific research institutions, factories and quality supervision departments to carry out material research and testing. Scope of application: heat treatment, carbonization, quenching, hardening layer, surface coating, steel, non-ferrous metals, micro and thin parts, etc. With Knoop indenter, the Knoop hardness of brittle and hard materials such as glass, ceramics, agate and artificial gemstones can be measured.

advantage:

The Vickers hardness tester is used to measure the Vickers hardness of thin materials. The square pyramid diamond indenter is used to press into the surface of the specimen under the action of the test force. After holding for a specified time, the test force is removed and the diagonal length of the indentation on the surface of the specimen is measured. The indentation of Vickers hardness tester test is square with clear outline and accurate diagonal measurement. Therefore, Vickers hardness test is one of the commonly used hardness test methods with high precision and good repeatability, which is superior to Brinell hardness tester.

Vickers hardness tester can measure a wide range of materials, from very soft materials (several Vickers hardness units) to very hard materials (3000 Vickers hardness units).

The advantage of Vickers hardness tester test is that its hardness value has nothing to do with the size of the test force. As long as the hardness of the material is uniform, the test force can be arbitrarily selected, and its hardness value remains unchanged. This is equivalent to having a unified scale in a wide range of hardness. This is superior to the Rockwell hardness test.

In the range of medium and low hardness values, the Vickers hardness test and Brinell hardness test results will get approximate hardness values on the same uniform material. Vickers hardness tester test force can be as small as 10 GF, indentation is very small, especially suitable for testing thin small materials.

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