阅读说明：本技术 一种新型碳化钛-铁铬铝热喷涂粉末及其制备方法 (Novel titanium carbide-iron chromium aluminum thermal spraying powder and preparation method thereof ) 是由 高峰 万伟伟 李�杰 吴超 张陆 张康 于 2020-07-23 设计创作，主要内容包括：一种新型碳化钛-铁铬铝热喷涂粉末及其制备方法,属于表面工程技术领域。粉末成分为TiC：占40～65％,FeNiCrAl占35～60％；以质量计各元素的含量为Ti：32～52％,C：8～13％,Fe：17～30％,Ni：8.5～15％,Cr：6～14％,Al：1.5～3％,Si：0.17～0.3％。该成分粉末可以提升碳化钛金属陶瓷涂层的耐腐蚀性能,耐中性盐雾腐蚀时间大于96小时,显著提高所得到涂层的耐腐蚀性能,能够在表面耐磨防护领域得到广泛应用。(A novel titanium carbide-iron chromium aluminum thermal spraying powder and a preparation method thereof belong to the technical field of surface engineering. The powder component is TiC: 40-65% of FeNiCrAl and 35-60% of FeNiCrAl; the contents of the elements by mass are Ti: 32-52%, C: 8-13%, Fe: 17-30%, Ni: 8.5-15%, Cr: 6-14%, Al: 1.5-3%, Si: 0.17 to 0.3 percent. The component powder can improve the corrosion resistance of the titanium carbide metal ceramic coating, the neutral salt spray corrosion resistance time is longer than 96 hours, the corrosion resistance of the obtained coating is obviously improved, and the titanium carbide metal ceramic coating can be widely applied to the field of surface wear-resistant protection.)

1. A novel titanium carbide-iron chromium aluminum thermal spraying powder is characterized in that the powder comprises the following components by mass: 40-65% of TiC; the FeNiCrAl accounts for 35-60%.

2. The novel titanium carbide-iron chromium aluminum thermal spray powder according to claim 1, characterized in that the contents of the respective elements by mass are: ti: 32-52%, C: 8-13%, Fe: 17-30%, Ni: 8.5-15%, Cr: 6-14%, Al: 1.5-3%, Si: 0.17 to 0.3 percent.

3. The novel titanium carbide-iron chromium aluminum thermal spray powder according to claim 1, wherein the optimum ratio of each component by mass is: 60% of TiC, 19.8% of Fe, 10% of Ni, 8% of Cr, 2% of Al and 0.2% of Si.

4. The method for preparing a novel titanium carbide-iron chromium aluminum thermal spray powder according to any one of claims 1 to 3, characterized by comprising the steps of:

(1) preparing raw materials: TiC powder accounting for 40-65% of the total weight of the composite powder; iron powder accounting for 17-30% of the total weight; nickel powder, which accounts for 8.5-15% of the total weight; chromium powder accounting for 6-14% of the total weight; aluminum powder accounting for 1.5-3% of the total weight; si powder accounting for 0.17-0.3% of the total weight;

(2) uniformly mixing the powder, adding deionized water to prepare a wet grinding medium, adding a binder and then carrying out ball milling to prepare mixed slurry;

(3) spray drying the mixed slurry to obtain agglomerated particles;

(4) sintering the agglomerated particles prepared in the step (3) to obtain powder;

(5) and (4) screening and grading the powder obtained in the step (4) to obtain a finished product.

5. The preparation method according to claim 4, wherein the optimal mixture ratio in the step (1) is as follows: 60% of TiC, 19.8% of Fe, 10% of Ni, 8% of Cr, 2% of Al and 0.2% of Si.

6. The preparation method according to claim 4, wherein the adhesive in the step (2) is polyvinyl alcohol or polyethylene glycol, the addition amount of the adhesive is 1-6% of the total weight of the raw materials, and the ball milling time is 12-72 hours.

7. The method of claim 4, wherein an antioxidant and an antifoaming agent are further added before the ball milling in the step (2).

8. The preparation method according to claim 4, wherein the spray drying process parameters in the step (3) are as follows: the inlet temperature of the centrifugal spray drying equipment is 200-240 ℃, the outlet temperature is 110-150 ℃, the rotating speed of an atomizing disc is 5000-20000 r/min, and the feeding amount is 100-400 ml/min.

9. The preparation method according to claim 4, wherein the sintering process parameters in the step (4) are as follows: sintering is carried out in a vacuum furnace, the sintering temperature is 1210-1380 ℃, the temperature is kept for 2-3 hours, then the sintering temperature is cooled to below 150 ℃ along with the furnace, and finally the sintering product is discharged from the furnace.

Technical Field

The invention belongs to the technical field of surface engineering, and relates to titanium carbide iron-based composite powder for thermal spraying, which can be used for surface wear-resistant protection in the industries of machinery, petroleum, chemical industry, ships, metallurgy, electric power and the like.

Background

Failure of industrial parts often occurs at the surface, and surface protection is a common method to increase the life of industrial parts. The hot spraying metal ceramic coating is a surface protection technology with wide application, the metal ceramic composite material has the hardness of ceramic and the toughness of metal, WC-Co is the most common metal ceramic composite material of the current hot spraying wear-resistant coating, however, tungsten and cobalt are strategic resources and are expensive, and the use is limited to a certain extent. TiC is a common carbide ceramic, has high hardness and low price, and has been widely applied to the hard alloy industry by partially replacing WC. In the field of thermal spraying, the application is less, the performance of supersonic flame spraying 75TiC-25FeCrAl materials (Properties of HVOF-sprayed TiC-FeCrAl coatings, Wear, 418-FeCrAl 419, (2019) and 36-51) is researched, and the result shows that the hardness of the TiC-FeCrAl coating can reach HV 1182-HV 1380 and the porosity is 0.53-1.1%. However, the corrosion resistance of the coating is insufficient, mainly because the flame flow temperature in the spraying process is above 2000 ℃, the spraying powder particles can be heated to above 1600 ℃, elements such as Cr, Al and the like can be separated out from the edges of the spraying powder in the cooling process, and the two elements are easily oxidized in the spraying process, so that the actual content of Cr and Al is reduced, and the corrosion resistance is reduced.

In practice, the coating sample wafer prepared by using common carbon steel as a substrate and 75TiC-25FeCrAl has rust stains within 50 hours under the condition of a neutral salt spray test. People urgently need a novel titanium carbide-iron chromium aluminum thermal spraying powder, the corrosion resistance of the obtained coating is improved, and the coating is widely applied to the field of surface wear resistance protection.

Disclosure of Invention

In order to solve the problems, the invention provides novel titanium carbide-iron chromium aluminum thermal spraying powder which can effectively improve the corrosion resistance of a titanium carbide metal ceramic coating. The titanium carbide-iron chromium aluminum thermal spraying powder comprises the following components in mass: 40-65% of TiC; the FeNiCrAl accounts for 35-60%.

Further, the titanium carbide-iron chromium aluminum thermal spraying powder comprises the following elements by mass: ti: 32-52%, C: 8-13%, Fe: 17-30%, Ni: 8.5-15%, Cr: 6-14%, Al: 1.5-3%, Si: 0.17 to 0.3 percent.

The optimal mixture ratio of each component by mass is as follows: 60% of TiC, 19.8% of Fe, 10% of Ni, 8% of Cr, 2% of Al and 0.2% of Si.

The inventor finds out through continuous exploration that: the powder material is subjected to rapid heating, melting, deformation, solidification and other processes in the thermal spraying process to form a coating, the powder deviates from a balance state in the rapid heating and melting process, TiC is partially dissolved in the iron-based alloy at high temperature, and in the rapid cooling process, because a certain content of Ni exists, the temperature is about 1647K, namely the solidification temperature point of the thermal spraying powder is about, the iron alloy can be preferentially solidified into austenite, and more Cr and Al can be dissolved in corrosive austenite, so that the corrosion resistance of the iron alloy is improved; if the Ni content is too small, the iron alloy is preferentially solidified into ferrite, Cr and Al have low solubility in ferrite and precipitate at the edges of the solidified particles, and the solidified particles are also at a high temperature and are easily oxidized. When the Ni content is too high, TiC can be dissolved into the iron alloy at high temperature, so that the hardness of the coating is low; the invention adds Si element, further limits the dissolution of TiC in the iron alloy, and Si can promote the TiC metal ceramic particles to form a SiO2 protective film on the surface in the spraying flight process, slows down the oxidation of Cr and Al, and improves the corrosion resistance of the coating.

The invention also provides a preparation method of the novel titanium carbide-iron chromium aluminum thermal spraying powder, which comprises the following steps:

(1) preparing raw materials: TiC powder accounting for 40-65% of the total weight of the composite powder; iron powder accounting for 17-30% of the total weight; nickel powder, which accounts for 8.5-15% of the total weight; chromium powder accounting for 6-14% of the total weight; aluminum powder accounting for 1.5-3% of the total weight; si powder accounting for 0.17-0.3% of the total weight.

The optimal mixture ratio is as follows: 60% of TiC, 19.8% of Fe, 10% of Ni, 8% of Cr, 2% of Al and 0.2% of Si.

(2) And uniformly mixing the powder, adding deionized water to prepare a wet grinding medium, adding a binder, and then carrying out ball milling to prepare mixed slurry.

(3) And (3) spray-drying the mixed slurry to obtain the agglomerated particles.

(4) Sintering the agglomerated particles prepared in the step (3) to obtain powder.

(5) And (4) screening and grading the powder obtained in the step (4) to obtain a finished product, namely the novel titanium carbide-iron chromium aluminum thermal spraying powder.

In some embodiments, the adhesive in step (2) is polyvinyl alcohol or polyethylene glycol, the amount of the adhesive added is 1-6% of the total weight of the raw materials, and the ball milling time is 12-72 hours.

In some embodiments, an antioxidant and an antifoaming agent are also added prior to ball milling in step (2).

In some embodiments, the spray drying process parameters in step (3) are: the inlet temperature of the centrifugal spray drying equipment is 200-240 ℃, the outlet temperature is 110-150 ℃, the rotating speed of an atomizing disc is 5000-20000 r/min, and the feeding amount is 100-400 ml/min.

In some embodiments, the sintering process parameters in step (4) are: sintering is carried out in a vacuum furnace, the sintering temperature is 1210-1380 ℃, the temperature is kept for 2-3 hours, then the sintering temperature is cooled to below 150 ℃ along with the furnace, and finally the sintering product is discharged from the furnace.

The invention has the beneficial effects that the novel titanium carbide-iron chromium aluminum thermal spraying powder and the preparation method thereof are provided, the neutral salt spray corrosion resistance time of the obtained coating is more than 96 hours, the corrosion resistance of the obtained coating is obviously improved, and the novel titanium carbide-iron chromium aluminum thermal spraying powder can be widely applied to the field of surface wear resistance protection.

Drawings

FIG. 1 shows the morphology of a novel titanium carbide-iron chromium aluminum thermal spray powder particle prepared by the present invention.

Detailed Description

The invention is further illustrated by the following examples.