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Yttrium silicate hot-spray composite powder and preparation method thereof

A composite powder and thermal spraying technology, which is applied in coating, fusion spraying, metal material coating process, etc., can solve the problem that the anti-high temperature oxidation coating cannot meet the use requirements, and achieve excellent high temperature oxidation resistance and low thermal conductivity The effect of high efficiency and not easy to peel off

Inactive Publication Date: 2012-07-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the harshness of the service environment increases, the existing high-temperature oxidation-resistant coatings can no longer meet the requirements of use. Therefore, it is of great application value to study new coatings to improve the oxidation resistance and meet the requirements of special and harsh environments.

Method used

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  • Yttrium silicate hot-spray composite powder and preparation method thereof
  • Yttrium silicate hot-spray composite powder and preparation method thereof
  • Yttrium silicate hot-spray composite powder and preparation method thereof

Examples

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preparation example Construction

[0016] The preparation method of yttrium silicate thermal spraying composite powder of the present invention comprises the following steps:

[0017] Step 1: SiO 2 and Y 2 o 3 The powder is uniformly mixed in the mixer for 20-24h.

[0018] Step 2: Prepress the mixed powder prepared in Step 1 under 600-800kPa.

[0019] Step 3: Sinter the powder prepared in step 2 in air at 1500-1700° C. for 4-6 hours.

[0020] Step 4: mechanically crushing the sintered body prepared in step 3.

[0021] Step 5: Classify the powder prepared in step 4.

[0022] Step 6: Analyze the phase composition of the powder obtained in Step 5 with an X-ray diffractometer.

[0023] Step 7: Measure the fluidity and bulk density of the powder obtained in step 5.

Embodiment 1

[0025] Step 1: Incorporate 25wt% SiO 2 and 75wt% Y 2 o 3 The powder is uniformly mixed in the mixer for 20h, and the particle size of the raw material is: SiO 2 2 o 3 : <15 μm.

[0026] Step 2: Prepress the mixed powder prepared in Step 1 under 700kPa.

[0027] Step 3: Sinter the powder prepared in step 2 in air at 1600°C for 4 hours.

[0028] Step 4: The sintered body prepared in step 3 is mechanically crushed, and the particle size of the thermal sprayed composite powder is 45-125 μm.

[0029] Step 5: Classify the powder prepared in step 4.

[0030] Step 6: use X-ray diffractometer analysis to obtain the phase composition of powder ( figure 1 ), the powder consists of Y 2 SiO 5 and Y 2 Si 2 o 7 composition. In this example, Y 2 Si 2 o 7 Accounting for 40wt%, Y 2 SiO 5 Accounting for 60wt%.

[0031] Step 7: Measure the fluidity and bulk density of the powder obtained in step 5. The fluidity of the powder is 43s / 50g, and the bulk density is 2.2g / cm 3 .

Embodiment 2

[0036] Step 1: Incorporate 25wt% SiO 2 and 75wt% Y 2 o 3 The powder is mixed in the mixer for 22h, the particle size of the raw material is: SiO 2 2 o 3 : <15 μm.

[0037] Step 2: Prepress the mixed powder prepared in Step 1 under 800kPa.

[0038] Step 3: Sinter the powder prepared in Step 2 in air at 1600°C for 5 hours.

[0039] Step 4: The sintered body prepared in step 3 is mechanically crushed, and the particle size of the thermal sprayed composite powder is 45-125 μm.

[0040] Step 5: Classify the powder prepared in step 4.

[0041] Step 6: use X-ray diffractometer analysis to obtain the phase composition of powder ( figure 2 ), the powder consists of Y 2 SiO 5 and Y 2 Si 2 o 7 composition. In this example, Y 2 Si 2 o 7 Accounting for 45wt%, Y 2 SiO 5 Accounting for 55 wt%.

[0042]Step 7: Measure the fluidity and bulk density of the powder obtained in step 5. The fluidity of the powder is 45s / 50g, and the bulk density is 2.3g / cm 3 .

[0043] Applica...

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Abstract

The invention relates to the field of hot-spray coating materials, particularly an yttrium silicate hot-spray composite powder and a preparation method thereof. The hot-spray composite powder is prepared from the following raw materials in percentage by weight: 23-27% of SiO2 and 73-77% of Y2O3. The particle size of SiO2 is smaller than 25 mu m, and the particle size of the Y2O3 is smaller than 15 mu m. The preparation method comprises the following steps: evenly mixing SiO2 and Y2O3 powder in a mixer for 20-24 hours, prepressing the mixed powder under the pressure of 600-800kPa, sintering at 1500-1700 DEG C in air for 4-6 hours, and finally, carrying out mechanical crushing and screening. The components of the hot-spray composite powder are Y2SiO5 and Y2Si2O7, the particle size is 45-125 mu m, the flowability is smaller than or equal to 55s / 50g, and the loose density is 1.5-3.0g / cm<3>. The coating prepared by the powder can effectively enhance the high-temperature oxidation resistance of the C / C-SiC composite material surface, has important application value, and can solve the problem of high-temperature oxidation of the material.

Description

technical field [0001] The invention relates to the field of thermal spraying coating materials, in particular to yttrium silicate thermal spraying composite powder and a preparation method thereof. Background technique [0002] With the increase of flight speed, the operating temperature of the engine continues to increase. For example, the temperature of the leading edge can reach 2100K, and the temperature of the channel in the combustion chamber will exceed 3000K, which greatly exceeds the temperature range that the existing superalloys can withstand. From the perspective of material specific strength and working temperature, C / C composite materials are ideal materials for ultra-high temperature work. But the excellent high-temperature performance of C / C composites can only be maintained in the absence of oxygen. Oxygen has a very significant impact on its performance. When the temperature is higher than 370 ° C, the oxidation reaction begins to generate CO and CO 2 , ...

Claims

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Application Information

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IPC IPC(8): C23C4/10C04B35/505C23C4/11
Inventor 张甲常新春侯万良徐娜栾胜家张春智
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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