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Composite metal ceramic powder, furnace roller coated with same and preparation method thereof

A technology of ceramic powder and composite metal, which is applied in metal material coating process, coating, fusion spraying and other directions, can solve the problems of decreasing ceramic composition ratio, increasing coating porosity, and poor uniformity, etc. The effect of improved service life, improved heat-resistant temperature range, good compactness and structural uniformity

Active Publication Date: 2010-09-22
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of transportation and spraying, it is easy to cause component segregation, the proportion of ceramic components in the coating decreases, and the uniformity becomes poor
At the same time, due to the difference in surface tension between the metal powder and the ceramic powder during the spraying process, the wetting of the molten metal powder to the ceramic powder is insufficient, resulting in an increase in the porosity of the coating and poor adhesion.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Preparation of composite cermet powder

[0049] Weigh in turn 3500 grams of MCrAlY powder, 4500 grams of chromium carbide powder, and 2000 grams of sodium hexatitanate whisker powder. Wherein, M in MCrAlY is nickel, and the specific general formula is NiCrAlY, and Ni, Cr, Al and Y account for 56.8%, 30%, 12% and 1.2% by weight of NiCrAlY respectively.

[0050] The composite cermet powder of the present invention is prepared by conventional wet ball milling and spray granulation methods.

[0051] The concrete preparation method of composite cermet powder is as follows:

[0052] (1) After loading an appropriate amount of ceramic ball milling media into the ball mill, add an appropriate amount of water;

[0053] (2) Add the above-mentioned weighed raw materials;

[0054] (3) Rotate the ball mill to mix the powder evenly;

[0055] (4) Add an appropriate amount of binder and necessary defoamer;

[0056] (5) Rotating the ball mill to mix all the materials evenly to o...

Embodiment 2

[0066] (1) Preparation of composite cermet powder

[0067] Weigh in turn 7000 grams of MCrAlY powder, 2500 grams of chromium carbide powder, and 500 grams of potassium hexatitanate whisker powder. Wherein, M in MCrAlY is cobalt, and the specific general formula is CoCrAlY. Co, Cr, Al and Y account for 80.8%, 15%, 4% and 0.2% by weight of CoCrAlY respectively.

[0068] The method described in Example 1 was used to prepare the composite cermet powder of the present invention.

[0069] (2) Preparation of furnace rollers

[0070] (1) Use heating, sandblasting and compressed air cleaning methods to roughen and clean the surface of the workpiece substrate in the furnace.

[0071] (2) Install the furnace roller to be sprayed on the turntable, set the appropriate rotation speed, spray gun moving speed and spraying distance according to the diameter of the roller surface, and spray the high-temperature resistant metal powder MCrAlY by high-speed oxygen flame spraying method, layer b...

Embodiment 3

[0076] (1) Preparation of composite cermet powder

[0077] Sequentially weigh 5430 grams of MCrAlTaY powder, 3370 grams of chromium carbide powder, and 1200 grams of sodium hexatitanate whisker powder. Among them, M in MCrAlTaY is a nickel-cobalt alloy, and the specific general formula is CoNiCrAlTaY, wherein Co, Ni, Cr, Al, Ta and Y account for 56.2%, 12%, 21%, 6.4%, and 4% of the weight content of CoNiCrAlTaY respectively and 0.4%.

[0078] The method described in Example 1 was used to prepare the composite cermet powder of the present invention.

[0079] (2) Preparation of furnace rollers

[0080] (1) Use heating, sandblasting and compressed air cleaning methods to roughen and clean the surface of the workpiece substrate in the furnace.

[0081] (2) First install the workpiece base body of the roller in the furnace on the turntable, set the appropriate rotation speed, spray gun moving speed and spraying distance according to the diameter of the roller surface, and then s...

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Abstract

The invention discloses a composite metal ceramic powder, a furnace roller coated with the same and a preparation method thereof. The composite metal ceramic powder contains the following components in percentage by weight: 35-70 percent of MCrAlY or MCrAlTaY, 25-45 percent of Cr3C2 and 5-20 percent of Na2Ti6O13 or K2Ti6O13, wherein M is Ni, Co or Ni-Co alloy. The furnace roller comprises a workpiece substrate and a coating sprayed on the workpiece substrate, wherein the coating comprises a surface layer and a bottom layer or a single surface layer, and the surface layer is made of the composite metal ceramic powder. The furnace roller is prepared by adopting a high-speed oxygen flame spraying method and has excellent heat resistance, wear resistance and nodule resistance performances and average service period reaching over 2 years.

Description

technical field [0001] The invention relates to a composite metal-ceramic powder, a furnace inner roller coated with the composite metal-ceramic powder and a preparation method of the furnace inner roller. Background technique [0002] In the process of the continuous annealing unit for cold-rolled strip steel, the movement of the strip steel is driven by the rotation of the rollers in the furnace, and the temperature in the high-temperature section of the furnace must reach about 1000 ° C. In addition, high temperature hardness and high temperature wear resistance are also required. The key component of this technology is the furnace inner roller. The rollers in the furnace are used to continuously convey the steel strip and complete the annealing process. The surface state of the rollers in the furnace has an important influence on the surface quality of the steel strip. During operation, the oxide film formed on the surface of the steel strip or formed and deposited durin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C32/00C22C30/00C22C19/05C22C19/07C22C49/14C23C4/06C23C4/02C23C4/12C23C4/073C23C4/129
Inventor 徐建明
Owner BAOSHAN IRON & STEEL CO LTD
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