Online connection preparation method for C/SiC materials

A wire connection and composite material technology, applied in the direction of connection components, mechanical equipment, threaded fasteners, etc., can solve the problems of affecting the connection strength of materials, high porosity of the connection surface, and easy loosening, so as to prevent loosening and improve Connection strength, porosity reduction effect

Inactive Publication Date: 2014-02-05
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the online screw connection of C / SiC materials has the problem of high porosity on the connection surface (the porosity generally exceeds 15%), which affects the connection strength of the material (the pull-off stress is less than 2000N), and it is easy to loosen or even fall off under strong vibration.

Method used

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  • Online connection preparation method for C/SiC materials
  • Online connection preparation method for C/SiC materials
  • Online connection preparation method for C/SiC materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] On-line screw connection of two C / SiC composite material samples

[0024] 1. Process two C / SiC samples with a size of 15mm×15mm×10mm, and machine a M8 countersunk threaded hole in the center.

[0025] 2. Screw processing

[0026] A countersunk screw made of C / SiC material with a length of 20mm is machined out. The thread surface of the C / SiC screw is processed into a plane parallel to the XY plane of the material, and the processing depth is 0.1mm.

[0027] 3. Use screws to connect two C / SiC samples online.

[0028] The prepared samples are analyzed, and the tensile strength is used to detect the pull-off stress assessment. The test results are shown in Table 1.

Embodiment 2～4

[0030] The preparation method is the same as in Example 1, the difference is that the processing depths of the thread surface processing planes of C / SiC screws are 0.3mm, 0.5mm and 1mm respectively, and the prepared samples are analyzed (the detection method is the same as in Example 1), and the detection results are shown in Table 1 shown.

[0031] Table 1

[0032]

[0033] It can be seen from Table 1 that when the plane processing depth is between 0.1-1mm, there is little difference in strength and porosity.

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Abstract

The invention provides an online connection preparation method for C / SiC materials. A channel which directly reaches a threaded surface from the external is manually formed by machining a plane parallel to a material XY plane on threads of a C / SiC screw; by later densification treatment, internal holes are eliminated, the bonding strength of the threads is improved, and a C / SiC screw connection structure with high strength and excellent loosening preventing performance is manufactured. The character of the online connection process of the existing C / SiC materials and a screw connection feature are utilized, a matrix can effectively permeate in a threaded connection surface by machining a plane which is parallel to the material XY surface on the threaded surface, the shortcoming that lots of holes are formed in the screw connection surface is overcome, the holes of the threaded connection surface are reduced, the connection strength and the loosening preventing performance of the screw are improved, and the screw can be effectively prevented from loosening or even dropping under the condition of violent vibration.

Description

technical field [0001] The invention relates to a C / SiC material online connection preparation method, which belongs to the technical field of ceramic material processing. Background technique [0002] Engine combustion chambers, nozzles and other parts are directly subjected to the high-speed erosion of high-temperature gas, which requires extremely high ablation resistance of materials, and also has high requirements on vibration resistance. At present, C / SiC materials are used, most of which are large-sized and complex-structured components, which cannot be processed and formed as a whole. After the components with a relatively single shape need to be prepared, they are assembled by connection. The main connection method of C / SiC materials is online connection, which refers to the connection during the densification process of carbon-ceramic materials, and then the pores between the connection surfaces are fully filled through the later densification, and the strength of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B39/282
Inventor 刘俊鹏王涛李晓东孙同臣于新民张万强冯超金鑫裴雨辰赵英民
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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