Crack prefabricating method of fragile ceramics, and crack prefabricating support and application thereof

A technology of prefabricated cracks and ceramics, which is applied in the preparation, sampling, and measuring devices of test samples, can solve the problems of long time consumption of prefabricated cracks and general pass rate of prefabricated cracks, and achieves high pass rate, shortened process time and process time. short effect

Active Publication Date: 2019-08-20
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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  • Crack prefabricating method of fragile ceramics, and crack prefabricating support and application thereof
  • Crack prefabricating method of fragile ceramics, and crack prefabricating support and application thereof
  • Crack prefabricating method of fragile ceramics, and crack prefabricating support and application thereof

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 crack prefabricating method of fragile ceramics, and a crack prefabricating support and application thereof. The method comprises the following steps that a triangular notch is made in a cuboid test piece; the test piece comprises a first side surface wholly segmented by the notch, a second side surface partially segmented by the notch, a crack expansion surface and a loadapplying surface; the test piece is pasted to a similarly U-shaped support to obtain a combined structure; the support comprises first, second and third plates; the first side surface makes contact with the first plate, the crack expansion surface makes contact with the second plate and fixedly connected with the second plate via a binder, and the load applying surface makes contact with the third plate; the combined structure is placed in a loading environment and applies a load, and the load is applied to the load applying surface via the support; the loading process is monitored, loading is not stopped until an emergent point, and the test piece prefabricated with a crack is obtained; and the test piece prefabricated with the crack is separated from the support and cleaned. Via the method and support, the length of the prefabricated crack is controlled, the qualified rate is high, technical time is saved, and the method and support are more practical.

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 Applications(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
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