Anti-oxidization and wear-resistance composite coating for four pipes of power plant boiler

A composite coating, anti-oxidation technology, applied in the direction of coating, metal material coating process, melting spray plating, etc., can solve problems such as leakage, and achieve the effect of improved service life, improved uniformity, and high melting point

Inactive Publication Date: 2013-07-31
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the "four tubes" of power plant boilers are prone to leakage, the invention proposes a composite coating for oxidation resistance and wear resistance of the "four tubes" of power plant boilers under high temperature conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The powder with the composition of 75wt.%NiCoCrAlY+25wt.%ZrC was mixed evenly with a planetary high-energy ball mill, and a new high-temperature anti-oxidation, wear and erosion coating with a thickness of 200μm was prepared by plasma spraying. The specific process is shown in the table 1 shows:

[0014] Table 1. Process parameters of the first group of low-pressure plasma spraying coatings composed of NiCoCrAlY-ZrC

[0015] Voltage (v)

[0016] 50～60

Embodiment 2

[0018] The powder with the composition of 80wt.%NiCoCrAlY+20wt.%ZrC was mixed evenly with a planetary high-energy ball mill, and a new high-temperature anti-oxidation, wear and erosion coating with a thickness of 250μm was prepared by plasma spraying. The specific process is shown in the table 2 shows:

[0019] Table 2. Process parameters of the second group of low-pressure plasma spraying to prepare coatings composed of NiCoCrAlY-ZrC system

[0020] Voltage (v)

Embodiment 3

[0022] The powder with the composition of 70wt.%NiCoCrAlY+30wt.%ZrC was mixed evenly with a planetary high-energy ball mill, and a new high-temperature anti-oxidation, wear and erosion coating with a thickness of 250μm was prepared by plasma spraying. The specific process is shown in the table 3 shows:

[0023] Table 3. Process parameters of the third group of low-pressure plasma spraying coatings composed of NiCoCrAlY-ZrC

[0024] Voltage (v)

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Abstract

The invention belongs to the protection field of high-temperature coatings, and in particular relates to an anti-oxidization and wear-resistance composite coating for four pipes of a power plant boiler. The composite coating comprises the following components in percent by weight: 70-80wt% of NiCoCrAlY and 20-30wt% of ZrC, wherein the thickness of the coating is 200-300mu m. During the preparation, by adopting a plasma spraying or supersonic speed flame spraying method, the NiCoCrAlY and ZrC with a certain proportion and granularity are stirred uniformly to form powder required by spraying, and a required coating is formed under a certain spraying process condition. The coating has high hardness at high temperature, and anti-oxidization, wear and corrosion properties of the coating are greatly improved, thus the defects of microcracks formed in the preparation process and the embrittlement of the existing coating are overcome, and the service life of the four pipes of the power plant boiler is greatly prolonged.

Description

technical field [0001] The invention belongs to the field of high-temperature coating protection, and in particular relates to an anti-oxidation and wear-resistant composite coating for "four tubes" of a power plant boiler under high temperature conditions. Background technique [0002] Modern society is more and more dependent on electric energy, so people pay more and more attention to the safe operation of power plants. Therefore, higher and higher requirements are put forward for the safety and stability of power plants. The concept of exhaustion is deeply rooted in the hearts of the people, and the safety of the "four tubes" of power plant boilers has also attracted much attention. The so-called "four tubes" of power plant boilers refer to the superheater, water wall, economizer and reheater in the boiler to ensure the normal The main aspect of the work is to prevent the leakage of the "four tubes" of the boiler. Since the "four tubes" of the boiler cover all the heatin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/16C23C4/04C23C4/073C23C4/129C23C4/134
Inventor 张东博曹健崔兴华
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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