A kind of ultra-high temperature corrosion-resistant composite material and its preparation method
A composite material and corrosion-resistant technology, applied in the field of composite materials, can solve the problems of easy oxidation and corrosion thermal conductivity, etc., to achieve the effect of enhancing oxidation resistance, reducing heat transmission, and improving high temperature corrosion resistance
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Embodiment 1
[0025] An ultra-high temperature corrosion-resistant composite material, including a C / C composite material substrate, on which an adhesive layer and a ceramic layer are deposited sequentially, the composition of the adhesive layer in Example 1 is NiCrAlY, and the ceramic layer The composition is YTaO 4 .
[0026] Rare earth tantalate (RETaO 4 ) or niobate (RENbO 4 ) preparation method, comprising the following steps:
[0027] Step 1: Put the RE 2 o 3 、 Ta 2 o 5 or Nb 2 o 5 According to the molar ratio of 1:1, it is added into a ball mill for ball milling. The rotating speed of the ball mill is 300r / min. After the ball milling, it is dried and sieved to obtain powder A.
[0028] Step 2: The powder A after drying and sieving in step 1 is prepared by high-temperature solid-state reaction method to obtain component RETaO 4 / RENbO 4 powder B, the reaction temperature is 1700° C., and the reaction time is 10 h; and the powder B is sieved with a 300-mesh sieve.
[0029] ...
Embodiment 2~17
[0035] The difference from Example 1 is that the composition or thickness of the composite material substrate and each coating layer is different, as shown in Tables 1-2 below for details.
[0036] Table 1 is the composition and thickness table of each coating of embodiment 2~9 ("--" means not containing in the table)
[0037]
[0038]
[0039] Table 2 is the composition and thickness table of each coating of embodiment 10~17 ("--" means not containing in the table)
[0040]
[0041]
Embodiment 18
[0043] The difference from Example 1 is that the composition of the ceramic layer includes YTaO 4 and SmTaO 4 , and the proportioning of the two powders is that the respective volume fractions are 50% respectively.
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