CN108531844A - Preparation method of rare earth oxide doped high-temperature oxidation resistant and wear-resistant coating for H13 steel surface protection - Google Patents

Abstract

The invention discloses a rare earth oxide doped high-temperature oxidation and wear-resistant coating for protecting the surface of H13 steel and a preparation method thereof, the method adopts an active combustion high-speed gas spraying technology (AC-HVAF) to spray powder on a substrate (H13 steel) to form a composite coating, the powder comprises Cr₃C₂-NiCr powder and CeO nanoparticles₂Powder, nano CeO₂The content of powder doping is 2-8 wt%; the balance being Cr₃C₂-NiCr powder. The coating prepared by the method has compact tissue, uniform distribution and a flattened structure, and the coating is tightly combined with the boundary. In addition, nano CeO is doped₂The structure density of the powder coating is further improved, the porosity is reduced, the defects of fewer unmelted objects, microcracks and the like are overcome, and the high-temperature oxidation resistance and the wear resistance are better, so that the high-temperature oxidation resistance and the wear resistance of the H13 steel in the using process are improved.

Description

Anti-oxidation and high-temperature oxidation resistance of a rare earth oxide doped for surface protection of H13 steel Preparation method of wear-resistant coating

technical field

The invention relates to the technical field of high-performance cermet composite coatings, in particular to a method for preparing a high-temperature oxidation-resistant and wear-resistant coating doped with rare earth oxides for H13 steel surface protection

Background technique

Since the 20th century, with the continuous expansion of industrial production scale and the rapid development of technology, the requirements for long-term effective and stable operation of mechanical parts and equipment under various harsh working conditions such as high temperature and high pressure have gradually increased. However, it has been difficult to meet higher requirements through simple heat treatment. The data shows that the loss caused by equipment failure caused by the failure of key basic parts accounts for 3-5% of my country's GDP. Among them, the failure modes such as local wear and corrosion on the surface accounted for more than 80%, especially shaft workpieces, cam connecting rods, chain gears and high-strength bolts that have been operating for a long time under alternating loads. Therefore, the necessary surface strengthening measures are taken to improve the wear resistance of parts to ensure their service life and reliability, which can ensure production quality, reduce production costs, and obtain good economic benefits.

The overall service life of molds in my country is significantly lower than that in developed countries, especially the service of H13 steel in harsh environments with high temperature, high wear and high stress, resulting in oxidation, wear, corrosion and fatigue cracking on the surface, which greatly shortens the service life of molds . In view of the fact that the failure of H13 steel is mostly caused by the surface, surface treatment of the mold is the key to improving its life. At present, H13 steel surface treatment technologies include nitriding, hard chrome plating, PVD (physical vapor deposition) and CVD (chemical vapor deposition), etc., all of which can improve the surface properties of the mold to a certain extent and prolong the life of the mold. However, these methods also have certain limitations: nitriding and CVD processes need to be carried out at relatively high temperatures, which can easily lead to deformation of the mold; limited by the size of the furnace, larger molds cannot be processed by PVD technology; hard chromium plating produces The Cr6+ has serious environmental pollution. The thermal spraying technology has the characteristics of high efficiency, no pollution, basically not limited by the size of the parts, and the substrate is less affected by heat. In recent years, it has been more and more widely used in the surface treatment and repair of molds.

Rare earth (RE) elements and their compounds have been widely used in many fields such as optics, electronics, metallurgy and material engineering due to their special physical and chemical properties. Rare earth elements can significantly improve the diffusion mechanism, reduce the growth rate of the oxide film, and refine the grain size of the oxide film; on the other hand, the addition of rare earth elements can increase the density of the oxide film, thereby effectively preventing oxygen from entering the coating . Nano-CeO ₂ is the most active rare-earth oxide among rare-earth materials, so doping Cr ₃ C ₂ -NiCr coating with nano-CeO ₂ is expected to be an effective way to improve its high-temperature performance.

Invention content:

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a high-temperature oxidation-resistant and wear-resistant coating doped with rare earth oxides for surface strengthening of H13 steel and a preparation method thereof.

The present invention adopts following technical scheme:

A high-temperature oxidation-resistant and wear-resistant coating doped with rare earth oxides for H13 steel surface protection, characterized in that the spray powder of the coating is Cr ₃ C ₂ -NiCr composite doped with nano-CeO ₂ powder powder.

Preferably, the spraying powder includes 92-98wt% Cr ₃ C ₂ -NiCr composite powder and 2-8wt% nanometer CeO ₂ powder in terms of mass percentage.

Preferably, the Cr ₃ C ₂ -NiCr composite powder includes 19-21wt% Ni, 9.1-10.1wt% C, 68.9-71.9wt% Cr, and the balance is O in terms of mass percentage; The particle size of the Cr ₃ C ₂ -NiCr composite powder is 15-45 μm.

Preferably, the nano-CeO ₂ powder has a purity of 99.99% and a particle size of 5-20 nm.

A method for preparing a rare earth oxide-doped high-temperature oxidation-resistant and wear-resistant coating for H13 steel surface protection, characterized in that it includes the following steps:

(1) Degreasing and roughening the surface of H13 steel;

(2) Add the prepared powder into the high-efficiency mixer for pre-mixing for 1-3 hours, and then add the evenly mixed material into the ball mill tank for ball milling for 1-3 hours;

(3) Preheat treatment of spray powder and H13 steel;

(4) The spray powder is sprayed on the surface of H13 steel by active combustion high-speed gas spraying technology to obtain a high-temperature oxidation-resistant and wear-resistant coating doped with rare earth oxides.

Preferably, the specific steps of degreasing and roughening the surface of the H13 steel described in step (1) are as follows: first use acetone to ultrasonically clean the surface of the H13 steel, and then use 24 to 80# white corundum to roughen the surface by sandblasting The roughness is Ra3～5μm.

Preferably, the ball mill described in step (2) has a rotating speed of 50r/min; during the ball milling process, every 30min of ball milling, stop for 5min; the diameter of the balls is 15mm, 10mm, 6mm, 5mm, and the mass ratio is 1:4:2 :1 ratio for matching.

Preferably, in step (2), 2% absolute ethanol can also be added as a process control agent during ball milling.

Preferably, in step (3), the specific steps of preheating the spray powder are: drying the spray powder at 80-120°C for 1-3 hours; the specific steps of preheating the H13 steel are: : Preheat H13 steel to 100-150°C.

Preferably, the process parameters of active combustion high-speed gas spraying described in step (3) are: fuel type is propane, fuel I pressure is 97-117Psi, fuel II pressure is 102-108Psi, air pressure is 105-108Psi, nitrogen gas The powder flow rate is 70-80L/min, the powder feeding rate is 10-30%, the spraying distance is 280-360mm, and the spraying angle is 80-90°.

The present invention adopts the Cr ₃ C ₂ -NiCr composite powder doped with nanometer CeO ₂ as the H13 steel surface protection coating material. Among its components, the Cr ₃ C ₂ hard phase can maintain good red hardness below 900°C, The coating plays a role of high temperature wear resistance; on the one hand, the NiCr phase acts as a bonding phase in the coating to improve the bonding strength and toughness of the coating; on the other hand, it has good high temperature performance and provides Good resistance to high temperature oxidation and thermal fatigue, Ni and Cr elements can form dense oxides at high temperatures to prevent oxygen elements from further entering the coating; _CeO2 can be used as a heterogeneous nucleation medium to increase the nucleation rate and refine Grain and structure, while the addition of CeO ₂ can increase the density of Cr ₂ O ₃ and NiCr ₂ O ₄ oxides at high temperature.

In order to avoid the oxidation of the composite powder particles during ball milling, the powder blending needs to be carried out in a glove box; in order to avoid welding between the powder and the ball milling tank during ball milling, 2% absolute ethanol can be added as a process control agent.

Beneficial effects of the present invention:

(1) The method of the present invention can prepare a metal-ceramic composite coating that combines well with the substrate and has high-temperature wear resistance, thermal fatigue resistance, corrosion resistance and high-temperature oxidation resistance, thereby significantly improving the service life of H13 steel.

(2) The Cr ₃ C ₂ -NiCr composite powder coating doped with nano-CeO ₂ powder has both excellent high-temperature wear resistance and high-temperature oxidation resistance, and can provide good protection for the H13 steel surface.

(3) Compared with the traditional supersonic flame and plasma spraying, the active combustion high-speed gas spraying technology is used to prepare the composite coating, because it has a lower flame temperature and a higher flame velocity, so it can effectively prevent Cr _{3 C2} oxidative decarburization to prepare a coating with high wear resistance, high bonding strength and low porosity.

(4) When coating is prepared by active combustion high-speed gas spraying technology in the present invention, compressed air is used instead of oxygen as the combustion-supporting gas, which can greatly reduce production costs.

Description of drawings

Figure 1. Cross-sectional morphology of 4wt% nano- _CeO2 doped prepared in Example 2.

Fig. 2 is a curve graph of the friction factor changing with time at 800°C for the coatings prepared in Examples 1, 2, 3, and 4 and the original coating without adding nano-CeO ₂ .

Detailed ways

The present invention will be further described below in conjunction with specific embodiments.

Example 1:

This example provides a high-temperature oxidation-resistant and wear-resistant coating doped with rare earth oxides for surface strengthening of H13 steel, which is prepared from Cr ₃ C ₂ -NiCr composite powder doped with nano-CeO ₂ powder . The composite powder is prepared by high-energy ball milling of 98wt% Cr ₃ C ₂ -NiCr and 2wt% nano-CeO ₂ , wherein the composition of the Cr ₃ C ₂ -NiCr composite powder is 19-21wt% Ni, 9.1-10.1wt% % C, 68.9-71.9wt% Cr, and the balance being O. The particle size of the Cr ₃ C ₂ -NiCr composite powder is 15-45 μm. The purity of the nano- _CeO2 powder is 99.99%, and the particle size is 5-20nm.

The preparation steps are as follows:

(1) The surface of the H13 steel was cleaned ultrasonically with acetone, and then roughened by sandblasting with 24# white corundum. The surface roughness after sandblasting was Ra3.6μm.

(2) Add the prepared powder into the high-efficiency mixer for pre-mixing for 1 hour, and then put the evenly mixed material into the ball mill tank for ball milling for 2 hours; the ball milling speed is 50r/min; during the ball milling process, every 30 minutes of ball milling, stop for 5 minutes; Ball diameters are 15mm, 10mm, 6mm, and 5mm, and they are matched according to the mass ratio of 1:4:2:1.

(3) Dry the Cr ₃ C ₂ -NiCr powder doped with nano CeO ₂ at 120°C for 2 hours before spraying, and preheat the H13 steel to 150°C.

(4) The spray powder is sprayed on the surface of H13 steel by active combustion high-speed gas spraying technology to obtain a high-temperature oxidation-resistant and wear-resistant coating doped with rare earth oxides. The spraying process parameters are as follows: fuel type is propane, fuel I pressure is 117Psi, fuel II pressure is 108Psi, air pressure is 108Psi, nitrogen powder feeding flow rate is 75L/min, powder feeding rate is 20%, spraying distance is 320mm, spraying The angle is 90°.

Example 2

This example provides a high-temperature oxidation-resistant and wear-resistant coating doped with rare earth oxides for surface strengthening of H13 steel, which is prepared from Cr ₃ C ₂ -NiCr composite powder doped with nano-CeO ₂ powder . The composite powder is prepared by high-energy ball milling of 96wt% Cr ₃ C ₂ -NiCr and 4wt% nano-CeO ₂ , and the composition of the Cr ₃ C ₂ -NiCr composite powder is 19-21wt% Ni, 9.1-10.1wt% % C, 68.9-71.9wt% Cr, and the balance being O. The particle size of the Cr ₃ C ₂ -NiCr composite powder is 15-45 μm. The purity of the nano- _CeO2 powder is 99.99%, and the particle size is 5-20nm.

The preparation steps are as follows:

(1) The surface of the H13 steel was cleaned ultrasonically with acetone, and then roughened by sandblasting with 24# white corundum. The surface roughness after sandblasting was Ra3.6μm.

(2) The prepared powder is added to the high-efficiency mixer for pre-mixing for 3 hours, and then the evenly mixed material is added to the ball mill tank for ball milling for 1 hour; the milling speed is 50r/min; during the ball milling process, every 30min, stop the machine for 5min; Ball diameters are 15mm, 10mm, 6mm, and 5mm, and they are matched according to the mass ratio of 1:4:2:1.

(3) Dry the Cr ₃ C ₂ -NiCr powder doped with nano CeO ₂ at 120°C for 2 hours before spraying, and preheat the H13 steel to 150°C.

(4) The spray powder is sprayed on the surface of H13 steel by active combustion high-speed gas spraying technology to obtain a high-temperature oxidation-resistant and wear-resistant coating doped with rare earth oxides. The spraying process parameters are as follows: fuel type is propane, fuel I pressure is 107Psi, fuel II pressure is 105Psi, air pressure is 105Psi, nitrogen powder feeding flow rate is 75L/min, powder feeding rate is 30%, spraying distance is 280mm, spraying The angle is 85°.

Example 3

This example provides a high-temperature oxidation-resistant and wear-resistant coating doped with rare earth oxides for surface strengthening of H13 steel, which is prepared from Cr ₃ C ₂ -NiCr composite powder doped with nano-CeO ₂ powder . The composite powder is prepared by high-energy ball milling of 94wt% Cr ₃ C ₂ -NiCr and 6wt% nano-CeO ₂ , and the composition of Cr ₃ C ₂ -NiCr composite powder is 19-21wt% Ni, 9.1-10.1wt% % of C, 68.9 to 71.9 wt%, and the balance of O. The particle size of the Cr ₃ C ₂ -NiCr composite powder is 15-45 μm. The purity of the nano- _CeO2 powder is 99.99%, and the particle size is 5-20nm.

The preparation steps are as follows:

(1) The surface of the H13 steel was cleaned ultrasonically with acetone, and then roughened by sandblasting with 24# white corundum. The surface roughness after sandblasting was Ra3.6μm.

(2) Add the prepared powder into the high-efficiency mixer for pre-mixing for 2 hours, and then put the evenly mixed material into the ball mill tank for ball milling for 3 hours; the ball milling speed is 50r/min; during the ball milling process, every 30 minutes of ball milling, stop for 5 minutes; Ball diameters are 15mm, 10mm, 6mm, and 5mm, and they are matched according to the mass ratio of 1:4:2:1.

(3) Dry the Cr ₃ C ₂ -NiCr powder doped with nano CeO ₂ at 120°C for 2 hours before spraying, and preheat the H13 steel to 150°C.

(4) The spray powder is sprayed on the surface of H13 steel by active combustion high-speed gas spraying technology to obtain a high-temperature oxidation-resistant and wear-resistant coating doped with rare earth oxides. The spraying process parameters are as follows: fuel type is propane, fuel I pressure is 117Psi, fuel II pressure is 108Psi, air pressure is 108Psi, nitrogen powder feeding flow rate is 75L/min, powder feeding rate is 20%, spraying distance is 360mm, spraying The angle is 85°.

Example 4

This embodiment provides a high-temperature oxidation-resistant and wear-resistant coating doped with rare earth oxides for surface strengthening of H13 steel. The coating is prepared from Cr3C2-NiCr composite powder doped with nanometer CeO2 powder. The composite powder consists of 92wt% of

Cr3C2-NiCr and 8wt% nano-CeO2 are prepared by high-energy ball milling, wherein the composition of Cr3C2-NiCr composite powder is 19-21wt% Ni, 9.1-10.1wt% C, 68.9-71.9wt%, and the balance is The particle size of the O composition Cr ₃ C ₂ -NiCr composite powder is 15-45 μm. The purity of the nano- _CeO2 powder is 99.99%, and the particle size is 5-20nm.

The preparation steps are as follows:

(1) The surface of the H13 steel was cleaned ultrasonically with acetone, and then roughened by sandblasting with 24# white corundum. The surface roughness after sandblasting was Ra3.6μm.

(2) Add the prepared powder into the high-efficiency mixer for pre-mixing for 1 hour, and then put the evenly mixed material into the ball mill tank for ball milling for 3 hours; the ball milling speed is 50r/min; during the ball milling process, every 30 minutes, stop the machine for 5 minutes; Ball diameters are 15mm, 10mm, 6mm, and 5mm, and they are matched according to the mass ratio of 1:4:2:1.

(3) Dry the Cr ₃ C ₂ -NiCr powder doped with nano CeO ₂ at 120°C for 2 hours before spraying, and preheat the H13 steel to 150°C.

(4) The spray powder is sprayed on the surface of H13 steel by active combustion high-speed gas spraying technology to obtain a high-temperature oxidation-resistant and wear-resistant coating doped with rare earth oxides. The spraying process parameters are as follows: fuel type is propane, fuel I pressure is 117Psi, fuel II pressure is 108Psi, air pressure is 108Psi, nitrogen powder feeding flow rate is 75L/min, powder feeding rate is 10%, spraying distance is 320mm, spraying The angle is 80°.

Example 5:

This example provides a high-temperature oxidation-resistant and wear-resistant coating doped with rare earth oxides for surface strengthening of H13 steel, which is prepared from Cr ₃ C ₂ -NiCr composite powder doped with nano-CeO ₂ powder . The composite powder is prepared by high-energy ball milling of 98wt% Cr ₃ C ₂ -NiCr and 2wt% nano-CeO ₂ , wherein the composition of the Cr ₃ C ₂ -NiCr composite powder is 19-21wt% Ni, 9.1-10.1wt% % C, 68.9-71.9wt% Cr, and the balance being O. The particle size of the Cr ₃ C ₂ -NiCr composite powder is 15-45 μm. The purity of the nano- _CeO2 powder is 99.99%, and the particle size is 5-20nm.

The preparation steps are as follows:

(1) The surface of the H13 steel is first cleaned with acetone ultrasonically, and then sandblasted and roughened with 35# white corundum. The surface roughness after sandblasting is Ra3μm.

(2) Add the prepared powder into the high-efficiency mixer for pre-mixing for 1 hour, and then put the evenly mixed material into the ball mill tank for ball milling for 2 hours; the ball milling speed is 50r/min; during the ball milling process, every 30 minutes of ball milling, stop for 5 minutes; Balls with diameters of 15mm, 10mm, 6mm, and 5mm are matched according to the mass ratio of 1:4:2:1; 2% absolute ethanol is added as a process control agent.

(3) Dry the Cr ₃ C ₂ -NiCr powder doped with nano CeO ₂ at 80°C for 3 hours before spraying, and preheat the H13 steel to 150°C.

(4) The spray powder is sprayed on the surface of H13 steel by active combustion high-speed gas spraying technology to obtain a high-temperature oxidation-resistant and wear-resistant coating doped with rare earth oxides. The spraying process parameters are as follows: fuel type is propane, fuel I pressure is 97Psi, fuel II pressure is 102Psi, air pressure is 106Psi, nitrogen powder feeding flow rate is 70L/min, powder feeding rate is 20%, spraying distance is 320mm, spraying The angle is 90°.

Example 6

This example provides a high-temperature oxidation-resistant and wear-resistant coating doped with rare earth oxides for surface strengthening of H13 steel, which is prepared from Cr ₃ C ₂ -NiCr composite powder doped with nano-CeO ₂ powder . The composite powder is prepared by high-energy ball milling of 96wt% Cr ₃ C ₂ -NiCr and 4wt% nano-CeO ₂ , and the composition of the Cr ₃ C ₂ -NiCr composite powder is 19-21wt% Ni, 9.1-10.1wt% % C, 68.9-71.9wt% Cr, and the balance being O. The particle size of the Cr ₃ C ₂ -NiCr composite powder is 15-45 μm. The purity of the nano- _CeO2 powder is 99.99%, and the particle size is 5-20nm.

The preparation steps are as follows:

(1) The surface of the H13 steel was first cleaned with acetone ultrasonically, and then sandblasted and roughened with 55# white corundum. The surface roughness after sandblasting was Ra4μm.

(2) The prepared powder is added to the high-efficiency mixer for pre-mixing for 3 hours, and then the evenly mixed material is added to the ball mill tank for ball milling for 1 hour; the milling speed is 50r/min; during the ball milling process, every 30min, stop the machine for 5min; Ball diameters are 15mm, 10mm, 6mm, and 5mm, and they are matched according to the mass ratio of 1:4:2:1.

(3) Dry the Cr ₃ C ₂ -NiCr powder doped with nano CeO ₂ at 110°C for 1 hour before spraying, and preheat the H13 steel to 100°C.

(4) The spray powder is sprayed on the surface of H13 steel by active combustion high-speed gas spraying technology to obtain a high-temperature oxidation-resistant and wear-resistant coating doped with rare earth oxides. The spraying process parameters are as follows: fuel type is propane, fuel I pressure is 107Psi, fuel II pressure is 105Psi, air pressure is 105Psi, nitrogen powder feeding flow rate is 80L/min, powder feeding rate is 30%, spraying distance is 280mm, spraying The angle is 85°.

Example 7

This example provides a high-temperature oxidation-resistant and wear-resistant coating doped with rare earth oxides for surface strengthening of H13 steel, which is prepared from Cr ₃ C ₂ -NiCr composite powder doped with nano-CeO ₂ powder . The composite powder is prepared by high-energy ball milling of 94wt% Cr ₃ C ₂ -NiCr and 6wt% nano-CeO ₂ , and the composition of Cr ₃ C ₂ -NiCr composite powder is 19-21wt% Ni, 9.1-10.1wt% % of C, 68.9 to 71.9 wt%, and the balance of O. The particle size of the Cr ₃ C ₂ -NiCr composite powder is 15-45 μm. The purity of the nano- _CeO2 powder is 99.99%, and the particle size is 5-20nm.

The preparation steps are as follows:

(1) The surface of the H13 steel is first cleaned with acetone ultrasonically, and then sandblasted and roughened with 80# white corundum. The surface roughness after sandblasting is Ra5μm.

(2) Add the prepared powder into the high-efficiency mixer for pre-mixing for 2 hours, and then put the evenly mixed material into the ball mill tank for ball milling for 3 hours; the ball milling speed is 50r/min; during the ball milling process, every 30 minutes of ball milling, stop for 5 minutes; Balls with diameters of 15mm, 10mm, 6mm, and 5mm are matched according to the mass ratio of 1:4:2:1; 2% absolute ethanol is added as a process control agent.

(3) Dry the Cr ₃ C ₂ -NiCr powder doped with nanometer CeO ₂ at 100°C for 1 hour before spraying, and preheat the H13 steel to 130°C.

(4) The spray powder is sprayed on the surface of H13 steel by active combustion high-speed gas spraying technology to obtain a high-temperature oxidation-resistant and wear-resistant coating doped with rare earth oxides. The spraying process parameters are as follows: fuel type is propane, fuel I pressure is 117Psi, fuel II pressure is 108Psi, air pressure is 108Psi, nitrogen powder feeding flow rate is 75L/min, powder feeding rate is 20%, spraying distance is 360mm, spraying The angle is 85°.

The performance test method of the high-temperature oxidation-resistant and wear-resistant coating doped with rare earth oxides of the present invention is as follows:

Friction and wear performance test: The friction and wear test is carried out on the HT-1000 high temperature friction and wear testing machine. The friction pair used is a Si ₃ N ₄ ceramic ball with a diameter of 6mm. The test load is 10N, the speed is 400rpm, the temperature is 800°C, the wear time for 30min.

High-temperature oxidation resistance test: This test refers to the HB 5258-2000 standard, and conducts a high-temperature oxidation test at 800°C×100h. Use an analytical balance with a sensitivity of 0.1 mg to weigh the test before and after oxidation, and calculate the oxidation weight gain per unit area of the sample.

Table 1 Nano-CeO ₂ Corresponding relationship between doping content and Examples and Comparative Examples.

Table 1

Table 2 is the performance test results of the coatings of various embodiments and comparative examples.

Table 2

As can be seen from the data in the above table, after spraying the Cr ₃ C ₂ -NiCr composite powder doped with nano-CeO ₂ , the performance of H13 steel in all aspects has been greatly improved, indicating that the composite coating of the present invention has a good effect on H13 steel. protective effect.

Further observation of the cross-sectional morphology of the metal-ceramic composite coating (as shown in Figure 1), it can be known that the metal-ceramic composite coating prepared by the present invention is well combined with the substrate, and the structure is uniform and compact without obvious microcracks and large pores. In addition, in Figure 2, "———" indicates the curve of the friction factor changing with time at 800°C for the coating prepared in the comparative example; "—▲—" indicates the friction of the coating prepared in Example 1 at 800°C The curve of factors changing with time; "—▼—" shows the curve of friction factor changing with time at 800°C for the coating prepared in Example 2; "—◆—" shows the coating prepared in Example 3 at 800°C Below is the curve of friction factor changing with time; "—●—" shows the curve of friction factor changing with time at 800°C for the coating prepared in Example 4. From the friction factor curves of nano-CeO ₂ doped Cr ₃ C ₂ -NiCr composite coating and undoped nano-CeO ₂ given in Fig. 2, it can be seen that: Cr ₃ C ₂ -NiCr doped with nano-CeO ₂ The friction factor of the composite coating is significantly smaller than that of the original coating without _CeO2 , and its friction factor curve is smoother, which shows that doping nano- _CeO2 is beneficial to reduce the friction coefficient of the coating at high temperature and improve the high temperature wear resistance .

The above embodiments are only used to illustrate the technical solution of the present invention and not to limit it. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall fall within the scope of the technical solution of the present invention.

Claims (10)

1. the resistance to high temperature oxidation and wear-resistant coating of a kind of rare earth oxide doping for the protection of H13 steel surfaces, which is characterized in that The dusty spray of the coating is nano Ce O₂The Cr of powder doping₃C₂- NiCr composite powders.

2. it is according to claim 1 it is a kind of for H13 steel surfaces protection rare earth oxide doping resistance to high temperature oxidation with Wear-resistant coating, which is characterized in that the dusty spray by mass percentage, includes the Cr of 92~98wt%₃C₂- NiCr is multiple Close the nano Ce O of powder and 2~8wt%₂Powder.

3. it is according to claim 1 it is a kind of for H13 steel surfaces protection rare earth oxide doping resistance to high temperature oxidation with Wear-resistant coating, which is characterized in that the Cr₃C₂- NiCr composite powders by mass percentage, including the Ni of 19~21wt%, The C of 9.1~10.1wt%, the Cr of 68.9~71.9wt%, surplus O；The Cr₃C₂- NiCr composite powder grain sizes be 15~ 45μm。

4. it is according to claim 1 it is a kind of for H13 steel surfaces protection rare earth oxide doping resistance to high temperature oxidation with Wear-resistant coating, which is characterized in that the nano Ce O₂Powder purity is 99.99%, and grain size is 5~20nm.

5. the preparation method of the resistance to high temperature oxidation and wear-resistant coating of a kind of rare earth oxide doping for the protection of H13 steel surfaces, It is characterised in that it includes following steps：

(1) oil removing and roughening treatment are carried out to H13 steel surfaces；

(2) powder prepared is added in efficient material mixer and premixes 1~3h, mixed uniform material is then added to ball in ball grinder Grind 1~3h；

(3) the pre-heat treatment is carried out to dusty spray and H13 steel；

(4) dusty spray is sprayed at by H13 steel surfaces using activated combustion high-velocity air-fuel spraying technology, obtains rare earth oxide and mixes Miscellaneous resistance to high temperature oxidation and wear-resistant coating.

6. it is according to claim 5 it is a kind of for H13 steel surfaces protection rare earth oxide doping resistance to high temperature oxidation with The preparation method of wear-resistant coating, which is characterized in that specific to the progress oil removing of H13 steel surfaces and roughening treatment described in step (1) Step is：First it is cleaned by ultrasonic H13 steel surfaces with acetone, then carries out sandblasting with the white fused alumina of 24~80# and be roughened to surface roughness For Ra3~5 μm.

7. it is according to claim 5 it is a kind of for H13 steel surfaces protection rare earth oxide doping resistance to high temperature oxidation with The preparation method of wear-resistant coating, which is characterized in that the ball milling described in step (2), rotating speed 50r/min；It is every in mechanical milling process Ball milling 30min shuts down 5min；Ball radius is 15mm, 10mm, 6mm, 5mm, is 1 according to mass ratio:4:2:1 ratio is taken Match.

8. it is according to claim 5 it is a kind of for H13 steel surfaces protection rare earth oxide doping resistance to high temperature oxidation with The preparation method of wear-resistant coating, which is characterized in that in step (2), 2% absolute ethyl alcohol can also be added as process in when ball milling Controlling agent.

9. it is according to claim 5 it is a kind of for H13 steel surfaces protection rare earth oxide doping resistance to high temperature oxidation with The preparation method of wear-resistant coating, which is characterized in that in step (3), to dusty spray carry out the pre-heat treatment the specific steps are：It will Dusty spray is placed in 1~3 hour drying and processing at 80~120 DEG C；To H13 steel carry out the pre-heat treatment the specific steps are：By H13 Steel is preheating to 100~150 DEG C.

10. it is according to claim 5 it is a kind of for H13 steel surfaces protection rare earth oxide doping resistance to high temperature oxidation with The preparation method of wear-resistant coating, which is characterized in that the technological parameter of the activated combustion high-velocity air-fuel spraying described in step (3) is： Fuel type is propane, I pressure of fuel is 97~117Psi, II pressure of fuel is 102~108Psi, air pressure be 105~ 108Psi, nitrogen powder feeding flow are 70~80L/min, powder feeding rate is 10~30%, spray distance is 280~360mm, angle of spray Degree is 80~90 °.