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Diamond Berkovich indenter design method based on strength factors

A technology of glass indenter and strength factor, which is applied in the direction of testing material hardness, etc., can solve problems such as failure to give convincing design reasons, achieve good wear resistance, high measurement accuracy, and improve processing efficiency.

Active Publication Date: 2015-12-16
HARBIN INST OF TECH
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Problems solved by technology

None of the above three design schemes for glass indenter crystal planes can give convincing design reasons

Method used

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  • Diamond Berkovich indenter design method based on strength factors
  • Diamond Berkovich indenter design method based on strength factors
  • Diamond Berkovich indenter design method based on strength factors

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specific Embodiment approach

[0042] The invention provides a method for designing the crystal plane and orientation of the side of the diamond glass indenter based on the intensity factor, which provides a scientific basis for the design of the diamond glass indenter. The radius of the blunt circle of the indenter optimized by the invention can reach Below 30nm, better than the technical index requirements of the international standard ISO14577, Figure 1-3 It is a schematic diagram of the superimposed influence of three typical crystal plane families on the characteristics of any crystal plane P. The specific implementation is as follows:

[0043] 1. Dynamic microscopic tensile strength of diamond crystal with any crystal plane and crystal orientation

[0044] According to the theory of dynamic microscopic tensile strength of diamond crystal and the principle of strength superposition, it is assumed that the dynamic microscopic tensile strength of any crystal plane of diamond crystal is the weighted sup...

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Abstract

A diamond Berkovich indenter design method based on strength factors comprises steps as follows: I, the dynamic microscopic tensile strength of three side surfaces of a diamond Berkovich indenter is assumed as weighed stacking of characters of three typical crystal plane families (100)(110)(111), and dynamic microscopic strength of any crystal plane and any crystal orientation of a diamond crystal is derived; II, the diamond Berkovich indenter with different crystal plane combinations is designed, and the dynamic microscopic tensile strength of each side surface is calculated; III, calculation and evaluation methods of the grinding strength factor and the anti-wear strength factor are put forward, and differences of radiuses of blunt rounds obtained by grinding an edge and a point of the indenter and the wear resistance of the indenter in the use process are quantitatively evaluated according to the grinding strength factors and the wear strength factors, obtained through comparison and calculation, of the edge and the point of the diamond Berkovich indenter. The diamond Berkovich indenter design method has important significance in breaking through technological monopoly of foreign countries, improving the measurement precision of the micro-nano scale mechanical property of a material and promoting development of manufacturing techniques of domestic high-precision diamond Berkovich indenters.

Description

technical field [0001] The invention relates to an intensity factor-based method for designing the crystal plane and crystal orientation of a diamond glass indenter, which is applied to the detection of micro-nano-scale mechanical properties on the surface of materials and belongs to the technical field of nano-hardness measurement. Background technique [0002] In the past thirty years, nanohardness measurement technology has been widely used in the detection of micro-nano scale mechanical properties of material surfaces. Nanohardness measurement technology refers to a method of testing the mechanical properties of a material in a small volume by using a high-precision diamond indenter to press into or scratch the surface of the material. The depth of indentation and scratches is generally micron or even nanoscale, which is an ideal way to test the mechanical properties of surface coatings, thin film materials, and micro-nano-scale surfaces of materials. The nanoindenter d...

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Application Information

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IPC IPC(8): G01N3/40
Inventor 宗文俊吴东姚学磊李增强孙涛
Owner HARBIN INST OF TECH
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