Density calibration method of carbon/silicon carbide ceramic matrix composite

A technology of silicon carbide ceramic matrix and composite materials, applied in the direction of analyzing materials, using radiation for material analysis, measuring devices, etc., can solve the problems of low measurement accuracy, achieve the effects of improving calibration accuracy, reducing the number of CT scans, and saving costs

Inactive Publication Date: 2008-12-03
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0004] In order to overcome the shortcomings of low measurement accuracy in the prior art, the present invention provides a method for calibrating the density of carbon / silicon carbide ceramic matrix composites, which utilizes the CVI process to prepare C / SiC composite materials at each densification stage. Combining with X-ray CT technology to detect the standard sample and the calibrated C / SiC composite material at one time, the accurate distribution of the internal density of the C / SiC composite material can be calibrated by using the function calibration relationship between the CT value of the standard sample and its density, which can improve the measurement Accuracy and fast detection speed

Method used

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  • Density calibration method of carbon/silicon carbide ceramic matrix composite
  • Density calibration method of carbon/silicon carbide ceramic matrix composite
  • Density calibration method of carbon/silicon carbide ceramic matrix composite

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Embodiment 1

[0020] Embodiment 1: refer to Figure 1~4 . The 1K carbon fiber is woven into a nozzle fiber preform using a three-dimensional four-step method, and a pyrolytic carbon interface layer is deposited on the nozzle fiber preform. The process conditions are: deposition temperature 800°C, pressure 0.2kPa, propylene flow rate 35ml / min, Ar The gas flow rate is 250ml / min, and the deposition time is 60h.

[0021] The silicon carbide substrate was deposited on the carbon fiber nozzle deposited with the pyrolytic carbon interface layer. The process conditions were: deposition temperature 800 ° C, pressure 4 kPa, H 2 Gas flow 150ml / min, Ar gas flow 250ml / min, trichloromethylsilane temperature 35°C, H 2 The molar mass ratio to MTS is 1:12, and the total deposition time is 240h.

[0022] At each dense stage of depositing the SiC matrix, a 4×25mm furnace sample was taken from the edge of the blank of the nozzle 1 as a gradient density standard sample. When the SiC matrix was deposited for...

Embodiment 2

[0028] Embodiment 2: refer to figure 1 , 5 And 6, the single-layer carbon fiber 0° non-weft cloth, tire mesh, 90° non-weft cloth, and tire mesh are stacked in sequence from the inside to the outside with several layers, and the density is 0.3 ~ 0.6g / cm3 prepared by the relay acupuncture method 3 Three-dimensional acupuncture nozzle prefabricated body, pyrolytic carbon interface layer deposited on the nozzle prefabricated body, the process conditions are: deposition temperature 800 ℃, pressure 0.2kPa, propylene flow rate 35ml / min, Ar gas flow rate 250ml / min, deposition time 60h .

[0029] The silicon carbide substrate was deposited on the three-dimensional needle-punched nozzle preform deposited with the pyrolytic carbon interface layer. The process conditions were: deposition temperature 800 ° C, pressure 4 kPa, H 2 Gas flow 150ml / min, Ar gas flow 250ml / min, trichloromethylsilane temperature 35°C, H 2 The molar mass ratio to MTS is 12, and the deposition time is 240h.

[0...

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Abstract

The invention discloses a density calibration method for a C / SiC ceramic matrix composite material. The method comprises the following steps: a characteristic that the C / SiC composite material is densified stage by stage by the CVI technique is utilized, furnace gradient density standard samples are obtained at each densifying stage of the C / SiC composite material preparation; CT images are obtained by adopting the industrial CT technique to synchronistically detect the gradient density standard samples and the calibrated C / SiC composite material; the functional calibration relation between the CT values of the gradient density standard samples and the densities thereof is established; and the functional calibration relation is used for calibrating the internal density distribution of the C / SiC composite material on the same CT scanning section. The CT section scanning of the standard samples and the calibrated C / SiC composite material is carried out synchronistically in one-step, so that the information of the internal density distribution of the composite material is accurate, the detection speed is high, the precision is high, and the cost is low.

Description

technical field [0001] The invention relates to a method for calibrating the density of a ceramic matrix composite material. Background technique [0002] As a representative high-temperature thermal structural material, C / SiC ceramic matrix composite has a good application prospect. However, the uneven internal density of C / SiC composites can easily lead to a decrease in mechanical properties, which is extremely detrimental to structural safety. Therefore, it is necessary to perform non-destructive calibration on the internal density distribution of C / SiC components for non-destructive evaluation. At present, the more effective density detection methods for structural components of ceramic matrix composites include: Archimedes drainage method after mechanical dissection, X-ray photography technology and X-ray computer tomography technology (hereinafter referred to as CT technology). Mechanical dissection can only be used as a destructive inspection of composite components...

Claims

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Application Information

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IPC IPC(8): G01N23/04G01N9/04
Inventor 梅辉成来飞邓晓东徐永东张立同孙磊
Owner NORTHWESTERN POLYTECHNICAL UNIV
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