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Brittle ceramic pre-crack method, pre-crack support and application

A technology of prefabricated cracks and ceramics, which is applied in the preparation, sampling, and instrumentation of test samples. It can solve the problems of general pass rate of prefabricated cracks and long prefabricated cracks, and achieve accurate fracture toughness data, high pass rate, and simple operation. effective and convenient effect

Active Publication Date: 2021-08-10
CHINA BUILDING MATERIALS ACAD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is limited by the loading device, so that the control of the load requires a long time of exploration before it can be skillfully operated, and the pass rate of the pre-crack is average, and the pre-crack takes a long time

Method used

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  • Brittle ceramic pre-crack method, pre-crack support and application
  • Brittle ceramic pre-crack method, pre-crack support and application
  • Brittle ceramic pre-crack method, pre-crack support and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-9

[0077] In the embodiment of the present invention, alumina ceramics, which are brittle and difficult to pre-crack, are taken as an example to pre-crack, and check the length of the crack and the morphology of the fracture. Figure 4 It is the kerf photo of the test piece in the present embodiment; Figure 5 It is the crack photo of the test piece in this embodiment.

[0078] The process parameters, process time and the length of the pre-cracks are shown in Table 1 below by pre-cracking the same batch of alumina ceramics of the same specification.

[0079] Process parameter, process time and the length of prefabricated crack in the embodiment of table 1

[0080]

[0081]

[0082]As can be seen from the data in Table 1 above, the test pieces described in Examples 1-9 are prefabricated with cracks according to the process parameters in Table 1, and the process time is short, with the shortest process time being 149s, less than 3 minutes; the leanest process parameter contr...

Embodiment 10-12

[0084] The materials of brittle ceramics were respectively adjusted to steatite porcelain, magnesium oxide ceramics and reaction sintered SiC ceramics, and the cracks were prefabricated according to the steps in Example 1. The length of the prefabricated cracks falls within 0.35-0.6 times of the width of the test piece, that is, the length of the prefabricated cracks is controlled, and the process time of the prefabricated cracks is short.

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Abstract

The invention provides a method for prefabricating cracks in brittle ceramics, a support for prefabricating cracks and applications thereof. The steps of the method are as follows: a rectangular parallelepiped test piece is made with a triangular cut; the test piece includes a first side that is completely split by the cut, a second side that is partially split by the cut, a crack propagation surface and a load application surface; A combined structure on the support; the support includes a first flat plate, a second flat plate and a third flat plate; the first side is in contact with the first flat plate, the crack propagation surface is in contact with the second flat plate and is fixedly connected by an adhesive, and the load application surface is in contact with the second flat plate Three-plate contact; place the combined structure in a loading environment and apply a load, wherein the load is applied to the load application surface through the bracket; the loading process is monitored, and the loading is stopped when it reaches the burst point to obtain a pre-cracked test piece; the pre-cracked test piece Separate from the bracket and wash. The crack length of the prefabricated cracks of the method and the support is controlled, the qualified rate is high, and the process time is saved, so it is more suitable for practical use.

Description

technical field [0001] The invention relates to the technical field of ceramic fracture toughness testing, in particular to a method for prefabricating cracks in brittle ceramics, a support for prefabricating cracks and applications thereof. Background technique [0002] Ceramic material is a typical brittle material, which has the advantages of high strength, high hardness, high modulus, high temperature resistance, corrosion resistance, etc., and has been widely used in electronics, machinery, aviation, aerospace and other fields. But the brittleness of ceramics is its biggest fatal shortcoming, which restricts its further development in these fields, and the fracture toughness of ceramics is an important performance index reflecting the brittleness of ceramics. [0003] There are many kinds of ceramic fracture toughness testing methods. The method recognized in the art to test the real ceramic fracture toughness value is the unilateral pre-cracked beam method. When measur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28
CPCG01N1/286
Inventor 万德田魏永金包亦望田远马德隆
Owner CHINA BUILDING MATERIALS ACAD