A boride cermet coating material and preparation method thereof

A cermet coating and boride technology, which is applied in metal material coating process, coating, melting spraying and other directions, can solve the problems of small batch, unsuitable for mass production and high cost

Active Publication Date: 2019-02-19
TIANJIN SPECIAL EQUIP INSPECTION INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these coating materials are mainly synthesized by self-propagating reaction or alloyed by ball milling. The preparation takes a long time, the batch is small, and the cost is high, so they are not suitable for mass production.

Method used

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  • A boride cermet coating material and preparation method thereof
  • A boride cermet coating material and preparation method thereof
  • A boride cermet coating material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Choose commercially available micron TiB with a purity of 99.6% or more 2 , Ni, Cr powder, TiB in the powder 2 Powder, Ni powder and Cr powder weight ratio is 60wt.%: 32wt.%: 8wt.%, organic dispersant PAANH 4 The mass of the powder is 0.8%-1.2% of the mass of the mixed powder, and the mass of the organic binder polyethylene glycol is 15%-20% of the mass of the mixed powder.

[0036] The following steps are used to prepare high-performance agglomerated and sintered powders:

[0037] (1) Put the above materials into deionized water, add the mixed solution into a planetary ball mill and mix at a low speed of 200r / min for 10 hours to form a viscous slurry.

[0038](2) Prepare agglomerated spherical powder by centrifugal spray drying method. The inlet temperature of the spray drying tower is 180°C, the outlet temperature is 90°C, the rotation speed of the centrifugal spray plate is 20000r / min, and the feed rate is 0.4mL / s for constant temperature and constant speed spray ...

Embodiment 2

[0047] Choose commercially available micron TiB with a purity of 99.6% or more 2 , Ni, Cr powder, TiB in the powder 2 The weight ratio of powder, Ni powder and Cr powder is 60wt.%: 32wt.%: 8wt.%, using the powder preparation process in Example 1 to prepare agglomerated and sintered powder.

[0048] The substrate used for spraying is low carbon steel, and the surface of the substrate is derusted, degreased and sandblasted before spraying.

[0049] The spraying equipment is the JP-5000 supersonic flame spraying system produced by the British TAFA company. The main spraying process parameters are: spraying distance 380mm, oxygen flow rate 940L / min, kerosene flow rate 24.6L / h, N 2 The flow rate is 10.3L / min, and the powder feeding rate is about 40g / min. The spraying thickness is controlled at 0.25-0.5mm.

[0050] The mechanical properties of the coating prepared in Example 2 were tested. The test results are shown in Table 1.

Embodiment 3

[0052] Choose commercially available micron TiB with a purity of 99.6% or more 2 , Ni, Cr powder, TiB in the powder 2 The weight ratio of powder, Ni powder and Cr powder is 70wt.%: 24wt.%: 6wt.%, using the powder preparation process in Example 1 to prepare agglomerated and sintered powder.

[0053] The substrate used for spraying is low carbon steel, and the surface of the substrate is derusted, degreased and sandblasted before spraying.

[0054] The spraying equipment is the JP-5000 supersonic flame spraying system produced by the British TAFA company. The main spraying process parameters are: spraying distance 355mm, oxygen flow rate 870L / min, kerosene flow rate 22.7L / h, N 2 The flow rate is 10.3L / min, and the powder feeding rate is about 40g / min. The spraying thickness is controlled at 0.25-0.5mm.

[0055] The mechanical properties of the coating prepared in Example 3 were tested. The test results are shown in Table 1.

[0056] It can be seen from Table 1 that the micr...

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Abstract

The invention discloses a boride metal ceramic coating material and a preparation method. According to the boride metal ceramic coating material and the preparation method, a centrifugal spraying and drying method is used for preparing boride metal ceramic powder which comprises, by mass, 60-80% of TiB2 powder, and 20-40% of Ni powder and Cr powder. The boride metal ceramic powder is made to have a certain bonding strength through a vacuum heat treatment method, and the surface of a metal substrate is coated with the boride metal ceramic powder through an HVOF method. A coating prepared according to the technical scheme is compact in structure, even in boride distribution, of a typical layered structure and excellent in mechanical property. Accordingly, the tribological property and the high-temperature oxidation resistance of the metal substrate are further improved.

Description

technical field [0001] The invention belongs to the field of surface protection of engineering materials, and relates to a boride cermet coating material and a preparation method thereof, in particular to a method of preparing agglomerated thermal spray powder by using a centrifugal spray drying method, and preparing a boride cermet coating by using a high-speed flame spraying method. Layer process preparation method. Background technique [0002] At present, the problem of high temperature protection of coal-fired boilers in power stations is still a long-term technical problem in the industry. Protecting the surface of the boiler's high-temperature heating surface can enhance its corrosion resistance, erosion resistance and wear resistance, and reduce the frequency of replacement parts and maintenance outages, which will greatly save boiler maintenance costs. Among many surface protection technologies, thermal spraying technology has very unique advantages, such as flexib...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/129C23C4/06B22F9/10
CPCB22F9/10C23C4/06
Inventor 萧艳彤李辉王海波赵强
Owner TIANJIN SPECIAL EQUIP INSPECTION INST
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