Wide-temperature-range ablation-resistant coating formed on base material and preparation method of wide-temperature-range ablation-resistant coating
A matrix material and anti-ablation technology, which is applied in the field of high-temperature thermal structural protective coating and preparation, can solve the problems of inability to prepare tissue, low porosity, and good performance, and achieve high-temperature anti-oxidation and ablation resistance, and effectively Protective effect, alleviate the effect of thermal expansion coefficient mismatch
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[0048] In a second aspect, the present invention provides a method for preparing the wide temperature range anti-ablation coating described in the first aspect of the present invention, the method comprising the following steps:
[0049] (1) Prepare a SiBCN transition layer on the surface of the base material by polymer impregnation-cracking method (PIP method);
[0050] (2) adopt vacuum plasma spraying method (VPS method) to prepare ZrB on the SiBCN transitional layer that step (1) obtains 2 -SiC-La 2 o 3 ultra-high temperature multiphase ceramic layer; and
[0051] (3) ZrB obtained in step (2) by polymer impregnation-cracking method (PIP method) 2 -SiC-La 2 o 3 A SiBCN sealing layer is prepared on the ultra-high temperature composite ceramic layer, thereby preparing the wide temperature range anti-ablation coating on the base material.
[0052] The method of the present invention adopts the polymer impregnation-cracking method combined with the vacuum plasma spraying m...
Embodiment 1
[0084] This example is in C f Preparation of SiBCN transition layer + ZrB on the surface of SiC ceramic matrix composite material 2 -SiC-La 2 o 3 Ultra-high temperature composite ceramic layer + SiBCN sealing layer.
[0085] ① Preparation C f / SiC ceramic matrix composite material matrix wafer, the size is Φ30×10mm (diameter is 30mm, thickness is 10mm), respectively with 240 # 、600 # 、1000 # Polish the surface with sandpaper, put it in an ethanol solution for ultrasonic cleaning for 10 min, and then put C f Put the / SiC substrate into an oven, raise the temperature to 80°C and keep it warm for 4 hours before use.
[0086] ②C f / SiC composite material is immersed in the SiBCN polymer precursor solution (obtained by diluting the SiBCN precursor (polyborosilazane) with the organic solvent xylene), the vacuum degree of the impregnation process is 0.09MPa, the impregnation pressure is 1MPa, and the impregnation time is 2h . Next, the material was cured with a precursor, ...
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