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Indentation method for testing hardness, fracture toughness and residual stress of brittle material

A technology for brittle materials and residual stress, applied in the field of fracture toughness and residual stress, and indentation method to test the hardness of brittle materials, can solve the problems of limiting the quality assurance and reliability of coating products, cumbersome testing process, and high professional requirements

Active Publication Date: 2015-04-08
湖南新生代新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These test methods have high professional requirements, high cost of instruments and equipment, and some test procedures are cumbersome, which is not conducive to the promotion and application of factories and enterprises.
[0007] To sum up, there is currently a lack of an efficient and simple scientific method and a cutting-edge scientific instrument to test the above three material parameters at the same time, which also greatly limits the quality assurance and reliability of coating products
The main status and reasons are: the existing testing instruments have a single function or lack of functions, and it is possible to measure key material indicators such as microhardness, fracture toughness, and residual stress of the coating material through multiple experimental instruments.
Moreover, the purchase cost of the instrument is high, and the maintenance cost and test cost are also very high. More importantly, the test process is cumbersome and complicated, requiring a high professional background and analysis ability, which is not conducive to the promotion and application of factories and enterprises. Therefore, it is urgent to develop more superior tests. Methods and matching scientific instruments and equipment to solve this key technical problem

Method used

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  • Indentation method for testing hardness, fracture toughness and residual stress of brittle material
  • Indentation method for testing hardness, fracture toughness and residual stress of brittle material
  • Indentation method for testing hardness, fracture toughness and residual stress of brittle material

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Embodiment 1

[0050] A device for testing hardness, fracture toughness and residual stress of brittle materials by indentation method, characterized in that the device includes a frame 30 on which an eyepiece 26, a liftable test operation platform 5 and an adjustment wheel 24 are arranged, The frame 30 is provided with a loading system 1;

[0051] The loading system 1 includes a first fixed support 11, a lever 12, a push rod 13, a boom 14 and a second motor 18, wherein,

[0052] The first fixed support 11 of the loading system 1 is connected with the second fixed support 28 on the frame 30, and is used to fix one end of the lever 12, and the other end of the lever 12 is provided with a suspension rod 14, and the suspension rod 14 is composed of multiple Two weights 15 are formed, one end of the first fixed support 11 close to the lever 12 is connected to the middle spindle 20 below the lever 12, the middle spindle 20 passes through the opening above the turntable 19 and the Vickers vickers ...

Embodiment 2

[0061] Adopt the device of embodiment 1 to be able to test the microhardness of material, can also test the fracture toughness of interface of brittle material and brittle coating film system, the residual stress at the measured position place simultaneously, the step of specific embodiment is as follows:

[0062] The first step is to prepare the sample. The thermal barrier coating ceramic material is sprayed on the high-temperature nickel alloy substrate by using the plasma spraying process. The composition of the coating system of the sample is: the transition layer material is NiCrAIY alloy, and its thickness is about 150 μm; the ceramic powder material is 8wt% Y 2 o 3 -ZrO 2 , The thickness of the sprayed ceramic layer is about 350 μm. In order to consider the effect of high temperature oxidation on the interfacial bonding performance of the thermal barrier coating system, some original samples were subjected to high temperature heat treatment at 1100 °C. Then the samp...

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Abstract

The invention discloses a device for testing the hardness, fracture toughness and residual stress of a brittle material with an indentation method, belonging to the technical field of material property representation. The device comprises a frame and an image acquiring system, wherein the frame is provided with an eye lens, a height-adjustable testing operation platform and an adjusting rotating wheel; a loading system is arranged in the frame, and comprises a fixing support base, a lever, a mandrel, a hanging rod, a middle main shaft and a second motor; and a first motor and the second motor of the loading system are connected with a computer through an I / O (Input / Output) control card. In the invention, the conventional digital image low-load Vickers hardness meter is improved, so that the micro-hardness of a material can be directly tested, and the fracture toughness and residual stress of an interface system of the brittle material and a brittle coating film material can be directly tested; and the device can be widely applied to departments such as industrial enterprises, universities, academies and the like for rapidly detecting relevant indexes.

Description

technical field [0001] The invention belongs to the technical field of material performance characterization, in particular to a method for testing the hardness, fracture toughness and residual stress of brittle materials by an indentation method. It is specifically related to the upgrade of the existing digital image small load Vickers hardness tester, which can not only directly test the microhardness of the material, but also directly test the fracture toughness and residual stress of the interface system between brittle materials and brittle coating film materials . Background technique [0002] In the field of new material technology, brittle coating film materials have mechanical, thermal, optical, electrical, magnetic and chemical properties that many substrate materials do not have, and have been widely used in microelectronic devices, magnetic memories, surface coatings and composite materials. It has played an irreplaceable important role in the national economy a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/44G01N3/00
Inventor 毛卫国万杰陈强戴翠英肖敏周益春
Owner 湖南新生代新材料科技有限公司