CN100455695C

CN100455695C - Non-crystalline wear preventive arc sprayed powder core filament material

Info

Publication number: CN100455695C
Application number: CNB2007100633536A
Authority: CN
Inventors: 曾德福
Original assignee: QIUGUAN TECH Co Ltd BEIJING
Current assignee: JIANGXI HENGDA HI-TECH CO LTD
Priority date: 2007-01-10
Filing date: 2007-01-10
Publication date: 2009-01-28
Anticipated expiration: 2027-01-10
Also published as: CN101003886A

Abstract

This invention relates to an electrical arc-coating abrasion-resistant amorphous thread like material with powdery core. The powdery core comprises: CrB powder 50-70 wt. %, Mo powder 1-5 wt. %, TiC powder 2-10 wt. %, Si powder 3-9 wt. %, Ni powder 3-7, and Fe. The sheath of the thread-like material is made of stainless steel band, preferentially 430 stainless steel band with thickness of 0.35mm and wide of 16.5mm. The powdery core added is 25-48% of total material. The final thread-like material has phiv of 2.0 mm. This invention utilizes electrical arc-coating technique to form a uniform, dense and amorphous coating layer on the cooled steel base. The thread-like material thus obtained has good wear and corrosion resistance. The boiler protected with this thread-like material has long service life.

Description

Non-crystalline wear preventive arc sprayed powder core filament material

Technical field

The present invention relates to a kind of non-crystalline wear preventive arc sprayed powder core filament material, mainly can be used as the electric-arc thermal spray coating material of boiler surface pipe big area protective coating.

Technical background

Adopt electric-arc thermal spray coating to make heating surface of coal-fired boiler pipe (water wall tube, superheater tube, reheater tube, the economizer tube, abbreviation boiler " four pipes ") big area protective coating is a kind of economy, effective process for protecting, because the work condition environment of these equipment is abominable, very easily produce high temperature erosion and corrosive wear, therefore require spray material under hot conditions, still to have very strong wear-resisting and corrosion resistance, and form effective protective coating, people have proposed multiple different spraying material at present, but more or less there are some shortcomings at aspect such as wear-resisting and anticorrosive, therefore be necessary to continually develop the material that makes new advances, to satisfy the needs of different occasions.

Summary of the invention

For overcoming the above-mentioned defective of prior art, the invention provides a kind of non-crystalline wear preventive arc sprayed powder core filament material, the coating that the electric arc spraying of this silk material process forms is with the bonding strength height of metallic matrix, and is high temperature resistant good with wear-corrosion resistance.

The present invention realizes that the technical scheme of above-mentioned purpose is: a kind of non-crystalline wear preventive arc sprayed powder core filament material, and its powder core is mixed by following each component, and the mass percent that each component accounts for the powder core is:

CrB powder: 50-70%, Mo powder: 1-5%, TiC powder: 2-10%, Si powder: 3-9%, Ni powder: 3-7%, Fe powder: surplus.

The invention has the beneficial effects as follows: owing to tying in of powder core each component of the present invention, adopt that existing arc spraying technology can form continuously on the refrigerative steel substrate, the amorphous coating of densification, no crystal boundary, coat-thickness can reach millimeter level size, has very strong wear-resisting and corrosion resistance under high temperature environment such as boiler.According to applicant's experiment, its technical indicator is: Vickers' hardness: 980-1100HV _0.1, bonding strength: 〉=55MPa, anti-relatively wear resistance: the 15-24 of Q235 steel doubly, working temperature: below 800 ℃, thermal shock resistance: 800 ℃ to 12 coating no changes of room temperature circulation.This technology can be widely used in the particularly making of the heating surface tube big area protective coating in circulating fluidized bed boiler and the coal-powder boiler of boiler, significant prolongation boiler work-ing life, also can be used for other similar applications.

Description of drawings

Accompanying drawing is a process flow sheet of the present invention.

Embodiment

The mass percent preferable range that powder core each component accounts for the powder core is:

CrB powder: 55-65%, Mo powder: 2-4%, TiC powder: 4-8%, Si powder: 4.5-7.5%, Ni powder: 4-6%, Fe powder: 14.5-25.5%.

Further preferable range is:

CrB powder: 57.5-62.5%, Mo powder: 2.5-3.5%, TiC powder: 5-7%, Si powder: 5.25-6.75%, Ni powder: 4.5-5.5%, Fe powder: 17.25-22.75%.

For example, in the powder core each component account for the mass percent of powder core can be according to the following example:

Embodiment 1:CrB powder: Mo powder 60%: TiC powder 3%: Si powder 6%: Ni powder 6%: Fe powder 5%: 20%.

Embodiment 2:CrB powder: Mo powder 50%: TiC powder 5%: Si powder 2%: Ni powder 9%: Fe powder 3%: 31%.

Embodiment 3:CrB powder: Mo powder 70%: TiC powder 1%: Si powder 10%: Ni powder 3%: Fe powder 7%: 9%.

Embodiment 4:CrB powder: Mo powder 55%: TiC powder 4%: Si powder 4%: Ni powder 7.5%: Fe powder 4%: 25.5%.

Embodiment 5:CrB powder: Mo powder 65%: TiC powder 2%: Si powder 8%: Ni powder 4.5%: Fe powder 6%: 14.5%.

Embodiment 6:CrB powder: Mo powder 57.5%: TiC powder 3.5%: Si powder 5%: Ni powder 6.75%: Fe powder 4.5%: 22.75%.

Embodiment 7:CrB powder: Mo powder 62.5%: TiC powder 2.5%: Si powder 7%: Ni powder 5.25%: Fe powder 5.5%: 17.25%.

The particle diameter of described CrB powder is preferably 45-75 μ m, and the TiC powder generally should coat through nickel, below the preferred 75 μ m of particle diameter, below the preferred 38 μ m of the particle diameter of other powder.

The mass percent (promptly adding the powder coefficient) that described powder core accounts for a material is 25-48%, preferred 33-40%, and further preferable range is 35-38%, for example 25%, 27%, 30%, 33%, 35%, 36.5%, 38%, 40%, 43%, 45% or 48%.

Preparation method of the present invention can comprise the following steps: referring to accompanying drawing

(1) gets satisfactory Fe powder, require in proportion to weigh;

(2) get satisfactory aerosolization Ni powder, Mo powder and Si powder, require in proportion to weigh;

(3) get satisfactory TiC powder and coat, require in proportion to weigh through nickel;

(4) get block CrB and carry out comminution by gas stream,, require in proportion to weigh through the screening and the satisfactory CrB powder of formation of reuniting;

(5) each powder with step (1), (2), (3) and (4) preparation mixes, and can adopt VH-500 type mixing machine to mix about 25 minutes;

(6) step (5) blended material is dried bake out temperature 150 degree, drying time 2 hours;

(7) make crust with Stainless Steel Band, preferred 430 Stainless Steel Bands, the Stainless Steel Band of preferred thick 0.35mm * wide 16.5mm (referring to cut out the back width) is cut out, shows to reach the standard grade after the mediation oven dry according to prior art, bends to U-lag through format roll;

(8) the powder core compound that step (6) is prepared adds powder according to the powder coefficient that adds that requires with powder feeder, is filled in the U-lag of crust;

(9) splice grafting mouth: adopt the crust U-lag sealing after format roll will be filled;

(10), form the finished silk material of φ 2.0mm by drawing or roll the silk material of a mode after will sealing tube reducing step by step;

(11) the finished silk material is turned to the required plate-like of dispatching from the factory, the product that formation can be dispatched from the factory after metering and packing.

Claims

1. non-crystalline wear preventive arc sprayed powder core filament material, it is characterized in that its powder core is mixed by following each component, the mass percent that each component accounts for the powder core is: CrB powder: 50-70%, Mo powder: 1-5%, TiC powder: 2-10%, Si powder: 3-9%, Ni powder: 3-7%, Fe powder: surplus.

2. non-crystalline wear preventive arc sprayed powder core filament material as claimed in claim 1, it is characterized in that the mass percent that described powder core each component accounts for the powder core is: CrB powder: 55-65%, Mo powder: 2-4%, TiC powder: 4-8%, Si powder: 4.5-7.5%, Ni powder: 4-6%, Fe powder: 14.5-25.5%, the mass percent of described each component adds up to 100%.

3. non-crystalline wear preventive arc sprayed powder core filament material as claimed in claim 2, it is characterized in that the mass percent that described powder core each component accounts for the powder core is: CrB powder: 57.5-62.5%, Mo powder: 2.5-3.5%, TiC powder: 5-7%, Si powder: 5.25-6.75%, Ni powder: 4.5-5.5%, Fe powder: 17.25-22.75%, the mass percent of described each component adds up to 100%.

4. as claim 1,2 or 3 described non-crystalline wear preventive arc sprayed powder core filament materials, the particle diameter that it is characterized in that described CrB powder is 45-75 μ m, and described TiC powder coats through nickel, and particle diameter is below the 75 μ m, and the particle diameter of other powder is below the 38 μ m.

5. as claim 1,2 or 3 described non-crystalline wear preventive arc sprayed powder core filament materials, it is characterized in that its crust adopts Stainless Steel Band to make.

6. non-crystalline wear preventive arc sprayed powder core filament material as claimed in claim 5 is characterized in that described Stainless Steel Band adopts 430 Stainless Steel Bands.

7. non-crystalline wear preventive arc sprayed powder core filament material as claimed in claim 5, it is characterized in that the specification after described crust Stainless Steel Band is cut out is thick 0.35mm * wide 16.5mm, adopt drawing or roll mode tube reducing step by step after adding powder and splice grafting mouth, the finished silk material specification of formation is φ 2.0mm.

8. as claim 1,2 or 3 described non-crystalline wear preventive arc sprayed powder core filament materials, it is characterized in that the mass percent that described powder core accounts for a material is 25-48%.

9. non-crystalline wear preventive arc sprayed powder core filament material as claimed in claim 8 is characterized in that the mass percent that described powder core accounts for a material is 33-40%.

10. non-crystalline wear preventive arc sprayed powder core filament material as claimed in claim 9 is characterized in that the mass percent that described powder core accounts for a material is 35-38%.