阅读说明：本技术 一种低碳钢表面制备渗钛涂层的方法 (Method for preparing titanizing coating on surface of low-carbon steel ) 是由 周雪峰 陈聪 金涛 刘万辉 许怡平 徐一 于 2018-08-31 设计创作，主要内容包括：本发明公开了一种低碳钢表面制备渗钛涂层的方法。本发明粉末包埋渗剂成分按质量百分比表示为45-50%的TiO<Sub>2</Sub>粉、15-18%的Al粉、3-5%的(NH<Sub>4</Sub>)<Sub>2</Sub>SO<Sub>4</Sub>粉、1-2%的I<Sub>2</Sub>粉、余量为Al<Sub>2</Sub>O<Sub>3</Sub>粉；在低碳钢表面制备上述渗钛涂层,包括以下步骤：将粉末包埋渗剂混合均匀后与经表面去氧化皮的低碳钢试样置于渗灌中,将渗灌置于真空电阻炉中,抽真空至0.1 Pa,通入氩气,保持压力为0.05-0.5MPa,升温至750-1000℃下保温2-10小时。采用本发明渗剂及固态粉末包埋渗钛方法,制备的渗钛涂层质量好,工艺简单,操作方便,成本低廉,能够方便控制渗钛层厚度,便于工业化生产。(The invention discloses a method for preparing a titanizing coating on the surface of low-carbon steel. The component of the powder embedding penetrating agent is 45-50% of TiO expressed by mass percentage 2 Powder, 15-18% of Al powder and 3-5% of (NH) 4 ) 2 SO 4 Powder, 1-2% of I 2 Powder, the balance being Al 2 O 3 Pulverizing; the titanizing coating is prepared on the surface of the low-carbon steel, and the method comprises the following steps: uniformly mixing the powder embedding penetrant, placing the mixture and a low-carbon steel sample with an oxide skin removed on the surface into an infiltration tank, placing the infiltration tank into a vacuum resistance furnace, vacuumizing to 0.1 Pa, introducing argon, keeping the pressure at 0.05-0.5MPa, and heating to 750 ℃ and 1000 ℃ for heat preservation for 2-10 hours. The titanium-infiltrated coating prepared by the infiltration agent and the solid powder embedding titanium-infiltrated method has the advantages of good quality, simple process, convenient operation, low cost, convenient control of the thickness of the titanium-infiltrated layer and convenient industrial production.)

1. The method for preparing the titanizing coating on the surface of the low-carbon steel is characterized by comprising the following steps of:

the first step, the preparation of powder embedding permeating agent: the powder embedding and permeating agent comprises the following components in percentage by mass: 45-50% TiO₂Powder, 15-18% of Al powder and 3-5% of (NH)₄)₂SO₄Powder, 1-2% of I₂Powder, the balance being Al₂O₃Pulverizing;

step two, processing and placing of the sample: putting the low-carbon steel sample subjected to surface activity treatment into an infiltration irrigation filled with a uniformly mixed powder embedding infiltration agent, and compacting the powder;

thirdly, preparing a titanizing coating by powder solid infiltration under the atmosphere: putting the infiltrating irrigation in the second step into a vacuum furnace, vacuumizing to less than or equal to 0.02Pa, introducing argon to 0.05-0.5MPa, heating to 750-.

2. The method of claim 1, wherein the TiO is₂The powder adopts multi-stage TiO with the grain diameters of 5 mu m and 20 mu m which are mixed according to the mass ratio of 7:3₂And (3) pulverizing.

3. The method of claim 1, wherein Al powder, (NH)₄)₂SO₄Powder, I₂Powder and Al₂O₃The particle size of the powder is 5-20 μm.

4. The method of claim 1, wherein the carbon content of the low carbon steel sample is 0.2 to 0.4%.

5. The method of claim 1, wherein the surface-activated mild steel sample is obtained by descaling by sanding, sanding to 800 ° with metallographic sandpaper, polishing, and ultrasonic cleaning with absolute ethanol.

6. The method of claim 1, wherein the powder is compacted at a pressure of 0.01 to 0.1 MPa.

7. The method of claim 1, wherein in the third step, the temperature rise rate is 10 ℃/min.

8. The method as claimed in claim 1, wherein in the third step, argon is introduced to 0.05-0.5MPa, the temperature is raised to 900 ℃ for 1-3 hours, and then raised to 1000 ℃ for 1-7 hours.

Technical Field

The invention relates to the field of wear-resistant and corrosion-resistant coatings, and discloses a solid powder penetrating agent component for preparing a titanizing coating on the surface of low-carbon steel and a method for embedding titanizing by using solid powder.

Background

After titanizing the surface of the low-carbon steel, a titanium-containing compound is formed on the surface layer, so that the low-carbon steel obtains low friction coefficient, high hardness and good corrosion resistance, and the application field of the low-carbon steel is obviously expanded. In recent years, researches on the preparation of titanizing coatings are going on, such as a gas titanizing method, a liquid titanizing method, a solid powder titanizing method, a dual-glow ion titanizing method and the like, wherein the solid powder titanizing method has the advantages of simple equipment, flexible use and the like, and has attracted great attention at home and abroad. Chinese patent CN 103938151a discloses a titanizing process using titanium sponge as main penetrating agent to prepare titanized coating, however, the titanium sponge has non-uniform purity, particle size, etc. to cause non-uniform penetrating layer. Chinese patent CN 103834914 a discloses a method for mechanically grinding and titanizing the surface of a steel material, which comprises the steps of mechanically grinding the surface of the steel material, and then carrying out low-temperature titanizing treatment in a plasma carburizing heat treatment furnace.

In a word, the traditional solid powder titanizing directly adopts titanium-containing powder as a penetrating agent, but titanium element is extremely active and expensive, and meanwhile, the methods have the defects of complex process, high raw material cost, low yield and the like, and limit the industrial large-scale production of the titanizing coating. Therefore, a simple, economical and effective preparation method of the titanizing coating is needed to meet the application of the wear-resistant and corrosion-resistant coating.

Disclosure of Invention

The invention aims to provide a method for preparing a titanizing coating on the surface of low-carbon steel, which solves the problems that the interface bonding strength of the coating and a substrate is low, the coating is easy to peel off in the using process, workpieces are rapidly abraded and scrapped and the like in the prior art.

A method for preparing a titanizing coating on the surface of low-carbon steel comprises the following steps:

the first step, the preparation of powder embedding permeating agent: the powder embedding and permeating agent comprises the following components in percentage by mass: 45-50% TiO₂Powder, 15-18%Al powder, 3-5% (NH)₄)₂SO₄Powder, 1-2% of I₂Powder, the balance being Al₂O₃Pulverizing;

step two, processing and placing of the sample: putting the low-carbon steel sample subjected to surface activity treatment into an infiltration irrigation filled with a uniformly mixed powder embedding infiltration agent, and compacting the powder;

thirdly, preparing a titanizing coating by powder solid infiltration under the atmosphere: putting the infiltrating irrigation in the second step into a vacuum furnace, vacuumizing to less than or equal to 0.02Pa, introducing argon to 0.05-0.5MPa, heating to 750-.

Further, in the first step, TiO₂The powder adopts multi-stage TiO with the grain diameters of 5 mu m and 20 mu m which are mixed according to the mass ratio of 7:3₂And (3) pulverizing.

Further, in the first step, Al powder, (NH)₄)₂SO₄Powder, I₂Powder and Al₂O₃The particle size of the powder is 5-20 μm.

Furthermore, in the second step, the carbon content of the low-carbon steel is 0.2-0.4%.

Further, in the second step, the low-carbon steel subjected to surface activity treatment is subjected to descaling by grinding, then is ground to No. 800 by metallographic abrasive paper and is polished, and then is subjected to ultrasonic cleaning by absolute ethyl alcohol to obtain the steel.

Further, in the second step, the pressure for compacting the powder is 0.01-0.1 MPa.

Further, in the third step, the temperature rise rate was 10 ℃/min.

Further, in the third step, argon is introduced to 0.05-0.5MPa, the temperature is raised to 900 ℃ for 1-3 hours at 750 ℃ and then raised to 1000 ℃ for 1-7 hours at 900 ℃.

Compared with the prior art, the invention has the following remarkable advantages: (1) the invention adopts TiO₂The powder replaces active and expensive Ti powder, and has simple process and low cost; (2) the invention has low titanizing temperature and short titanizing time, and the obtained coating is stable and controllable; (3) the invention deposits a titanizing coating on the surface of the low-carbon steel under the condition of argon atmosphere, so thatIt forms metallurgical bonding with the substrate, thereby ensuring the service performance of the titanizing coating.

Drawings

FIG. 1 is a flow chart of the preparation of the titanizing coating of the present invention.

FIG. 2 shows the surface morphology of the low carbon steel of example 2 of the present invention after surface titanizing.

Detailed Description

The invention is further elucidated with reference to the figures and embodiments.

The preparation process of the titanizing coating of the invention is shown in figure 1.