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A kind of yttrium holmium monosilicate solid solution material and preparation method thereof

A monosilicate, solid solution technology, applied in the field of yttrium holmium monosilicate 2SiO5 solid solution material and its preparation, can solve the problems of limitation, high density and cost, low mechanical strength, etc., and achieve good high temperature stability and high temperature stiffness. Good, excellent high temperature mechanical properties

Active Publication Date: 2021-07-23
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But Y 2 SiO 5 The mechanical strength is low, and as an environmental barrier coating, the impact damage performance against foreign objects at high temperature (FOD, Foreign Object Debris) is poor
Studies have shown that holmium monosilicate (Ho 2 SiO 5 ) has excellent high temperature strength, but its high density and cost limit its application in aviation and aerospace

Method used

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  • A kind of yttrium holmium monosilicate solid solution material and preparation method thereof
  • A kind of yttrium holmium monosilicate solid solution material and preparation method thereof
  • A kind of yttrium holmium monosilicate solid solution material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0023] The original particle size of raw material yttrium oxide, holmium oxide and silicon dioxide powder is 600 orders, with 22.65 grams of yttrium oxide, 18.9 grams of holmium oxide and 9 grams of silicon dioxide (molar ratio is to meet chemical formula (Y 2 / 3 Ho 1 / 3 ) 2 SiO 5 , with Y 2 o 3 powder (purity 99.99wt%), Ho 2 o 3 powder (purity 99.99wt%) and SiO 2 Powder (purity 99.99wt%) is used as a raw material, and absolute ethanol is used as a medium, and the powder is put into a silicon nitride ball mill jar for ball milling for 8 hours, and the dried powder is subjected to pressureless sintering in a muffle furnace. The sintering process is as follows: heating up to 1500°C at a rate of 5°C / min and holding for 0.5 hours. Put the solid solution powder after pressureless sintering into a ball mill jar for ball milling for 10 hours, then dry, put the dried solid solution powder into a graphite mold for cold pressing at room temperature, and finally put the cold pressed...

Embodiment 2

[0026] The original particle size of raw material yttrium oxide, holmium oxide and silicon dioxide powder is 800 orders, with 7.53 grams of yttrium oxide, 25.2 grams of holmium oxide and 6.0 grams of silicon dioxide (molar ratio is to meet chemical formula (Y 1 / 3 Ho 2 / 3 ) 2 SiO 5 , with Y 2 o 3 powder (purity 99.99wt%), Ho 2 o 3 powder (purity 99.99wt%) and SiO 2 Powder (purity 99.99wt%) is used as raw material, and absolute ethanol is used as a medium, and the powder is put into a silicon nitride ball mill jar for ball milling for 24 hours, and the dried powder is subjected to pressureless sintering in a muffle furnace. The sintering process is as follows: heating up to 1600°C at a rate of 15°C / min, and holding the temperature for 1.5 hours. Put the solid solution powder after pressureless sintering into a ball mill jar for ball milling for 24 hours, then dry, put the dried solid solution powder into a graphite mold for cold pressing at room temperature, and finally pu...

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Abstract

The present invention involves the field of ceramic materials for extreme environments. It is specifically a pyrite with excellent high -temperature mechanical properties (Y 1‑x HO x Cure 2 SIO 5 Soluble materials and their preparation methods.The chemical formula of the solid solid solution of monocular silicate is (Y 1‑x HO x Cure 2 SIO 5 The value range of X is 0 <x <1.The preparation process is specifically: based on oxide powder, oxide powder and silicon powder as the raw material, mixed with physical mechanical methods, and no sintering in the air atmosphere, and then sintering in the hot pressure furnace that can protect the atmosphere.Single silicate solid solution material.The present invention prepares a high -purity and high temperature mechanical performance (Y 1‑x HO x Cure 2 SIO 5 Soluble ceramic material.

Description

technical field [0001] The invention relates to the field of ceramic materials used in extreme environments, in particular to a yttrium holmium monosilicate (Y) with excellent high-temperature mechanical properties 1-x Ho x ) 2 SiO 5 Solid solution materials and methods for their preparation. Background technique [0002] Yttrium monosilicate (Y 2 SiO 5 ) has low density, good high temperature stability, high damage tolerance, good processability, high chemical and thermal stability, good corrosion resistance, very low thermal conductivity, as silicon Ceramic-based environmental barrier coatings have good application prospects in high thrust-to-weight ratio aeroengine hot-end components. (Z.Q.Sun, etal. Inter. Mater. Rev. (International Materials Review). 2014(59) 357–383.). But Y 2 SiO 5 The mechanical strength is low, and as an environmental barrier coating, the impact damage performance (FOD, Foreign Object Debris) against foreign objects at high temperature is p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/16C04B35/626C04B35/645
CPCC04B35/16C04B35/62675C04B35/6268C04B35/645C04B2235/3224C04B2235/3225C04B2235/6562C04B2235/6567C04B2235/658
Inventor 王京阳张洁田志林孙鲁超
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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