Lutetium monosilicate/lutetium pyrosilicate diphasic composite environmental barrier coating material and preparation method thereof
A technology of lutetium disilicate and coating material, which is applied in the field of lutetium monosilicate/lutetium disilicate dual-phase composite environmental barrier coating material and its preparation, and can solve cracks, damage of matrix materials, decrease of coating toughness, etc. question
Inactive Publication Date: 2014-04-30
BEIHANG UNIV
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[0003] According to the research on the basic status of the current coating materials, it can be seen that the use of Lu alone 2 Si 2 o 7 or Lu 2 SiO 5 As silicon-based non-oxide ceramics (SiC, Si 3 N 4 ) The surface layer material of the environmental barrier coating will have serious consequences such as decreased toughness of the coating, cracks, and damage to the base material under the working environment of the engine
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[0051] 1. Preparation of lutetium monosilicate, lutetium disilicate and composite samples
[0052] 1.1. Lu 2 Si 2 o 7 Powder preparation
[0053] SiO 2 with Lu 2 o 3 After mixing at a ratio of 2:1, dissolve it in an appropriate amount of absolute ethanol, put it into a 100mL nylon ball mill jar together with agate balls, and use a ball mill for wet ball milling for 6 hours. After taking it out, pour the ball-milled liquid sample into a glass dish, and put it into a constant temperature box to dry at 100°C for 3 hours. Press the mixed powder into a block (20MPa) with a tablet machine, put it into a tube furnace, and sinter at 1550°C in an Ar gas protective atmosphere (programmed temperature rise for 6 hours (2 Si 2 o 7 .
[0054] 1.2. Lu 2 SiO 5 Powder preparation
[0055] SiO 2 with Lu 2 o 3 After mixing at a ratio of 1:1, dissolve it in an appropriate amount of absolute ethanol, put it into a 100mL nylon ball mill jar together with agate balls, and use a ball m...
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The invention relates to a lutetium monosilicate / lutetium pyrosilicate diphasic composite innovation-type environmental barrier coating and an assembly having the surface with the composite environmental barrier coating. The composite coating adopts an Lu2Si2O7 coating to be composited with a certain amount of an Lu2SiO5 component, so as to solve the problem that because an Lu2Si2O7 environmental barrier coating on an SiC ceramic surface generates toughness reduction and cracks under an aero-engine working environmental condition, a substrate is exposed to a high-temperature combustion atmosphere resulting in generation of corrosion and other phenomena. The invention also relates to a method for preparing the assembly. The method includes the steps: after crushing Lu2SiO5 and Lu2Si2O7 obtained by sintering, mixing according to a predetermined proportion; carrying out press molding of the Lu2SiO5-Lu2Si2O7 mixture obtained by mixing; and carrying out high temperature sintering of the press-molded Lu2SiO5-Lu2Si2O7 mixture, and thus obtaining a lutetium monosilicate / lutetium pyrosilicate diphasic composite environmental barrier coating material.
Description
technical field [0001] The invention relates to a monosilicate lutetium / pyrosilicate lutetium dual-phase composite environmental barrier coating material and a preparation method thereof, which are used for protection against SiC-Si-mullite system corrosion. Background technique [0002] The use of environmental barrier coatings (Environmental Barrier Coatings, EBCs) to reduce the corrosion of C / SiC composites in aero-engine service environments (such as water vapor, molten salt, etc.) has become one of the hotspots in the research of aero-engine materials. Various types of environmental barrier coating materials have been developed so far, such as mullite / YSZ (ZrO 2 -8wt%Y 2 o 3 ), mullite / BSAS ((1-x)BaO xSrO Al 2 o 3 2SiO2 2 , 0<x<1) and rare earth silicates, among which BSAS has been successfully put into application. Compared with the BSAS system, the rare earth silicate material not only has a low thermal expansion coefficient, good phase stability and excel...
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IPC IPC(8): C04B35/50C04B35/622
Inventor 许越李晶
Owner BEIHANG UNIV