A kind of c/sic composite material and preparation method
A composite material and material density technology, which is applied in the field of C/SiC composite materials and preparation, can solve the problems of reducing the porosity of C/SiC composite materials, the effect is not obvious, and the porosity is reduced, so as to improve the ablation resistance and improve the Mechanical properties, the effect of small molecular weight
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Examples
Embodiment 1
[0028] 1. The carbon fiber prefabricated body with carbon cloth laminated stitching structure is used, and the low-density C / C composite material is prepared by chemical vapor deposition (CVI) to a density of 0.95g / cm 3 .
[0029] 2. Using the polycarbosilane precursor solution as the impregnation solution, the SiC matrix is densified by the PIP process to a density of 1.4g / cm 3 .
[0030] 3. Using the zirconium precursor solution as the impregnating solution, the PIP process is used for densification, and the number of cycles is 2;
[0031] 4. Using the polycarbosilane precursor solution as the impregnation solution, the SiC matrix is densified by the PIP process until the material density increases by ≤1%.
[0032] The C / SiC composite material prepared in this example is used for testing, the density is GJB / T8133.14 "Test Method for Physical and Chemical Properties of Electric Carbon Products Part 14: Bulk Density", and the open porosity is HB5367.3-86 "Carbon Graphit...
Embodiment 2
[0034] 1. The carbon fiber prefabricated body with carbon cloth laminated stitching structure is used, and the low-density C / C composite material is prepared by chemical vapor deposition (CVI) to a density of 0.95g / cm 3 .
[0035] 2. Using the polycarbosilane precursor solution as the impregnation solution, the SiC matrix is densified by the PIP process to a density of 1.6g / cm 3 .
[0036] 3. Using the zirconium precursor solution as the impregnation solution, the PIP process is used for densification, and the number of cycles is 3 times.
[0037] 4. Using the polycarbosilane precursor solution as the impregnation solution, the SiC matrix is densified by the PIP process until the material density increases by ≤1%.
[0038] The C / SiC composite material prepared by this example is used for testing (the test method is the same as in Example 1), and the porosity of this example is 4.0%. Compared with the C / SiC composite material (the same total number of PIP times) prepared ...
Embodiment 3、4
[0040] Examples 3 and 4 adopt the zirconium precursor PIP process for densification, the number of cycles is 1 and 6 respectively, and the rest are the same as the process of Example 1.
[0041] The C / SiC composite material prepared by this example 3 is used for testing (the test method is the same as in Example 1), and the porosity of this embodiment is 4.7%, which is compared with the C / SiC composite material prepared by conventional processes (the same total number of PIPs) , the open porosity is reduced by 20%, and the tensile strength is increased by 9%.
[0042] The C / SiC composite material prepared by this example 4 is used for testing (the test method is the same as in Example 1), and the porosity of this embodiment is 4.6%, which is compared with the C / SiC composite material prepared by conventional processes (the same total number of PIPs) , the open porosity was reduced by 28%, and the tensile strength was increased by 11%.
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Abstract
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