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

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...

Examples

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)

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...

Examples

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)