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High-performance ceramic with surface-modified polycrystalline mullite fibers compounded with rare earth lanthanum zirconate and preparation method thereof
The invention discloses a high-performance ceramic with surface-modified polycrystalline mullite fibers compounded with rare earth lanthanum zirconate and a preparation method thereof. The surfaces ofpolycrystalline mullite fibers are treated and coated with aluminum oxide to obtain polycrystalline mullite fibers coated with aluminum oxide on the surface; a large amount of nanoscale high-activitypolycrystalline rare earth lanthanum zirconate powder is prepared by using a self-propagating combustion method; and the purpose of improving the mechanical property is achieved by adding the surface-modified polycrystalline mullite fibers into the lanthanum zirconate ceramic powder. The preparation method disclosed by the invention comprises the following steps: preparing surface-modified polycrystalline mullite fibers, preparing polycrystalline rare earth lanthanum zirconate, and sintering a ceramic biscuit at high temperature and high pressure. The preparation method disclosed by the invention is stable and reliable in process and simple to operate, the mechanical strength of the rare earth lanthanum zirconate ceramic is obviously improved, and the thermal conductivity can be effectively reduced within a certain doping range, so that the rare earth lanthanum zirconate ceramic becomes a high-temperature thermal insulation material with reliable mechanical bearing performance.
本发明公开了一种表面改性多晶莫来石纤维复合稀土锆酸镧的高性能陶瓷及其制备方法。本发明通过对多晶莫来石纤维表面进行处理，再对其表面进行包覆氧化铝，制备得到表面包覆氧化铝的多晶莫来石纤维；运用自蔓延燃烧法大量制备纳米级高活性多晶稀土锆酸镧粉末；通过在锆酸镧陶瓷粉末中加入表面改性多晶莫来石纤维以达到提高力学性能的目的。本发明公开的制备方法包括表面改性多晶莫来石纤维制备、多晶稀土锆酸镧制备、陶瓷素坯高温高压烧结。本发明的制备方法工艺稳定可靠、操作简单，稀土锆酸镧陶瓷的力学强度有明显提高，在一定掺杂范围内可以有效降低热导率，使其成为具有可靠力学承载性能的高温隔热材料。
High-performance ceramic with surface-modified polycrystalline mullite fibers compounded with rare earth lanthanum zirconate and preparation method thereof
The invention discloses a high-performance ceramic with surface-modified polycrystalline mullite fibers compounded with rare earth lanthanum zirconate and a preparation method thereof. The surfaces ofpolycrystalline mullite fibers are treated and coated with aluminum oxide to obtain polycrystalline mullite fibers coated with aluminum oxide on the surface; a large amount of nanoscale high-activitypolycrystalline rare earth lanthanum zirconate powder is prepared by using a self-propagating combustion method; and the purpose of improving the mechanical property is achieved by adding the surface-modified polycrystalline mullite fibers into the lanthanum zirconate ceramic powder. The preparation method disclosed by the invention comprises the following steps: preparing surface-modified polycrystalline mullite fibers, preparing polycrystalline rare earth lanthanum zirconate, and sintering a ceramic biscuit at high temperature and high pressure. The preparation method disclosed by the invention is stable and reliable in process and simple to operate, the mechanical strength of the rare earth lanthanum zirconate ceramic is obviously improved, and the thermal conductivity can be effectively reduced within a certain doping range, so that the rare earth lanthanum zirconate ceramic becomes a high-temperature thermal insulation material with reliable mechanical bearing performance.
本发明公开了一种表面改性多晶莫来石纤维复合稀土锆酸镧的高性能陶瓷及其制备方法。本发明通过对多晶莫来石纤维表面进行处理，再对其表面进行包覆氧化铝，制备得到表面包覆氧化铝的多晶莫来石纤维；运用自蔓延燃烧法大量制备纳米级高活性多晶稀土锆酸镧粉末；通过在锆酸镧陶瓷粉末中加入表面改性多晶莫来石纤维以达到提高力学性能的目的。本发明公开的制备方法包括表面改性多晶莫来石纤维制备、多晶稀土锆酸镧制备、陶瓷素坯高温高压烧结。本发明的制备方法工艺稳定可靠、操作简单，稀土锆酸镧陶瓷的力学强度有明显提高，在一定掺杂范围内可以有效降低热导率，使其成为具有可靠力学承载性能的高温隔热材料。
High-performance ceramic with surface-modified polycrystalline mullite fibers compounded with rare earth lanthanum zirconate and preparation method thereof
一种表面改性多晶莫来石纤维复合稀土锆酸镧的高性能陶瓷及其制备方法
LIU YI (author) / YAN DONGMING (author) / XIAO YU (author) / WANG HUAN (author)
2020-05-05
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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