ZTA ceramic particle preform, preparation and application of realizing metallurgical interface bonding between ZTA and high manganese steel base

Abstract

The application discloses a ZTA ceramic particle preform, preparation and application of realizing metallurgical interface combination between ZTA and high manganese steel matrix. The application adopts a ball milling process to prepare a slurry from high manganese steel powder, Zr-Fe powder, ZTA micro powder and ethanol, soaks ZTA particles in the slurry, takes out and dries and sinter, obtains ZTA particles with a single layer of coating, soaks the ZTA particles in high manganese steel powder slurry again, obtains ZTA particles with two layers of coating, obtains ZTA ceramic preform through pressureless sintering, realizes solidification of the double coating layers, and the ZTA ceramic porous preform can effectively promote high manganese steel melt infiltration and prevent the preform from collapsing under thermal shock during casting. Through the bridge effect of the FeZr-ZTA-high manganese steel powder double coating layers, a metallurgical combination interface is formed between the ZTA and the high manganese steel matrix, so that the prepared ZTA ceramic particle reinforced high manganese steel composite material has excellent three-body wear resistance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of powder metallurgy and casting, and particularly relates to a double-layer coated modified ZTA ceramic particle porous preform and a preparation method and application thereof. BACKGROUND

[0002] Wear is ubiquitous in the fields of metallurgy, petroleum, chemical industry, construction, and national defense technology, and has a decisive influence on the service reliability and service life of workpieces and equipment. At present, high production efficiency and sustainable development are increasingly pursued in industrial production, but traditional wear-resistant materials have been unable to meet the performance requirements under severe working conditions, and there is an urgent need to develop new long-acting wear-resistant materials to fundamentally reduce wear, prolong the service life of equipment, improve production efficiency, and reduce energy loss.

[0003] High manganese steel is a wear-resistant steel material specially designed for heavy industry. Under the action of severe impact or contact stress, the surface of high manganese steel will rapidly harden, and the characteristics of external hardness and internal toughness can both resist wear and impact. Currently, high manganese steel has been widely used in the fields of quarrying, mining, excavation, coal industry, casting, and steel industry. Compared with high manganese steel, zirconia toughened alumina (ZTA) ceramic reinforced high manganese steel matrix composite can combine the characteristics of high manganese steel and ZTA ceramic, and is expected to further improve the performance of high manganese steel matrix materials such as high-impact resistance, high-temperature resistance, and wear resistance, which has attracted widespread attention from academia and engineering. However, during the casting forming of the composite material, due to the poor wettability of ZTA ceramic particles and high manganese steel melt, the pouring temperature is high, and only a mechanical bonding interface is often formed between ZTA ceramic particles and the high manganese steel matrix, or even a physical gap is easily produced between the two interfaces, resulting in the inability to fully play the potential composite effect of ZTA ceramic and high manganese steel matrix, and the overall wear resistance of the composite material is not as expected. In order to realize the low-cost and large-scale production of high-performance ZTA ceramic particle reinforced high manganese steel matrix composite, surface coating treatment must be performed on the ZTA ceramic particles to improve the wettability between the ZTA ceramic particles and the high manganese steel matrix through the surface active coating layer, and to promote the formation of a metallurgical bonding interface, thereby fully exploiting the potential composite effect of ZTA ceramic particles and high manganese steel matrix.

[0004] In order to prevent the ZTA ceramic particles from being scattered by the steel liquid melt during the casting process, it is an effective means to prepare the ZTA ceramic particles into a porous preform. Therefore, the present application combines the double-layer activation coating treatment on the surface of the ZTA ceramic particles with the preparation of the porous preform, develops a preparation method of the double-layer coated modified ZTA ceramic particle porous preform, and applies it to the preparation of the ZTA reinforced high manganese steel matrix composite material, significantly improves the interface wettability between the ZTA ceramic particles and the high manganese steel matrix, realizes the metallurgical interface bonding therebetween, and greatly improves the wear resistance of the composite material. The interface regulation strategy involved in the present application can strongly promote the industrial production and large-scale engineering application of the ZTA reinforced high manganese steel matrix composite material, and is also suitable for developing other iron-based composite materials such as high chromium cast iron and alloy steel, and has very important theoretical and engineering application value. SUMMARY

[0005] In order to solve the defects and deficiencies of the prior art, the primary purpose of the present application is to provide a preparation method of a double-layer coated modified ZTA ceramic particle porous preform. Specifically, high manganese steel powder, Zr-Fe alloy powder and ZTA micro powder are mixed by using a ball milling process, and anhydrous ethanol is added to prepare a slurry, then the ZTA particles are soaked in the slurry to obtain ZTA particles coated with the slurry, then sintering treatment is carried out at 1050-1100 DEG C, and then the modified ZTA particles are immersed in a slurry composed of high manganese steel powder and anhydrous ethanol to obtain ZTA particles with two coating layers. On this basis, the ZTA particles with two coating layers are placed in a graphite mold, and a ZTA ceramic porous preform is obtained after pressureless sintering. The preform obtained by the method is beneficial to the composite of ZTA ceramic and metal material, and can also realize the metallurgical bonding of the ceramic and metal interface.

[0006] Another purpose of the present application is to provide a double-layer coated modified ZTA ceramic particle porous preform obtained by the above preparation method.

[0007] Still another purpose of the present application is to provide the application of the above double-layer coated modified ZTA ceramic particle porous preform in a high manganese steel matrix composite material.

[0008] The purpose of the present application is achieved by the following technical solutions:

[0009] A preparation method of a double-layer coated modified ZTA ceramic porous preform, comprising the following steps:

[0010] (1) mixing Zr-Fe alloy powder, ZTA micro powder, high manganese steel powder and anhydrous ethanol by ball milling to obtain a mixed powder slurry;

[0011] (2) immerging ZTA particles into the mixed powder slurry of step (1) to make the slurry coat the surface of ZTA particles, taking out the ZTA particles and drying, and pre-sintering at 1050-1100℃ to obtain single-layer coated ZTA particles;

[0012] (3) mixing high manganese steel powder with anhydrous ethanol to obtain a slurry, and immerging the single-layer coated ZTA particles obtained in step (2) into the slurry to make the high manganese steel powder uniformly coat the surface of the single-layer coated ZTA particles, taking out and drying, and loading the double-layer coated ZTA particles into a mold to perform pressureless sintering at 1250-1450℃ to obtain double-layer coated modified porous ZTA ceramic preform.

[0013] Preferably, the particle size of the Zr-Fe alloy powder in step (1) is 200-300 mesh.

[0014] Preferably, the mass percentage of Zr in the Zr-Fe alloy powder in step (1) is 30-60%.

[0015] Preferably, the particle size of the ZTA micro-powder in step (1) is 3-5 microns.

[0016] Preferably, the particle size of the high manganese steel powder in steps (1) and (3) is 300-400 mesh.

[0017] Preferably, the weight ratio of the Zr-Fe alloy powder, ZTA micro-powder and high manganese steel powder in step (1) is 4-8:2-6:5-6.

[0018] Preferably, the anhydrous ethanol in step (1) accounts for 15-25% of the weight of the slurry.

[0019] Preferably, the ball milling in step (1) is mechanical ball milling, the ball diameter is 5-10 mm, the weight ratio of the ball to the mixed powder is 5:1-8:1, the rotation speed is 250-350 r / min, and the ball milling time is 300-640 min.

[0020] Preferably, the particle size of the ZTA particles in step (2) is 10-15 mesh.

[0021] Preferably, the weight ratio of the ZTA particles to the coating layer mixed powder in step (2) is 5-8:1.

[0022] Preferably, the drying in steps (2) and (3) is all under vacuum condition at 60-80℃ for 3-4 h, in order to evaporate and remove the anhydrous ethanol in the particles.

[0023] Preferably, the pre-sintering time in step (2) is 45-60 min.

[0024] Preferably, in step (3), the high manganese steel powder accounts for 20-27% by weight, the anhydrous ethanol accounts for 20-25%, and the rest is the single-layer coated ZTA particles.

[0025] Preferably, the time for the pressureless sintering in step (3) is 120-180 min.

[0026] Preferably, the slurry-coated particles in steps (2) and (3) need to be stirred to mix the raw materials uniformly, and the stirring speed can not be limited as long as it can achieve the purpose of the present step.

[0027] The ball-milling mixing in step (1), the pre-sintering in step (2), and the pressureless sintering in step (3) are all carried out in an inert gas atmosphere, and the inert gas is at least one of argon, helium, and nitrogen.

[0028] The present application provides a double-layer coated modified ZTA ceramic particle porous preform prepared by the above preparation method.

[0029] The present application provides an application of the above double-layer coated modified ZTA ceramic particle porous preform in reinforcing an iron-based composite material.

[0030] The application steps include: fixing the above double-layer coated modified ZTA ceramic particle porous preform in a casting cavity, pouring an iron-based melt into the cavity, and obtaining a ZTA ceramic particle reinforced iron-based composite material.

[0031] Preferably, the iron-based material is at least one of high manganese steel, high chromium cast iron, and alloy steel.

[0032] The present application provides a preparation method of a double-layer coated modified ZTA ceramic particle porous preform reinforced high manganese steel composite material, which includes the following steps:

[0033] Fixing the above double-layer coated modified ZTA ceramic particle porous preform in a casting cavity, pouring a high manganese steel melt into the cavity, and obtaining a composite material with metallurgical bonding between the ZTA ceramic and the high manganese steel matrix.

[0034] Preferably, the temperature of the high manganese steel melt when it is discharged from the furnace is controlled to be 1520-1570℃, the pouring temperature is controlled to be 1500±20℃, and slag removal and deoxygenation treatment can be performed before pouring.

[0035] The above preparation method of a double-layer coated modified ZTA ceramic particle porous preform reinforced high manganese steel composite material is a method for realizing the metallurgical bonding between the ZTA ceramic particles and the high manganese steel matrix.

[0036] The application provides the double-layer coated modified ZTA ceramic particle porous preform reinforced high manganese steel composite material prepared by the preparation method.

[0037] The application provides application of the double-layer coated modified ZTA ceramic particle porous preform reinforced high manganese steel composite material prepared by the preparation method.

[0038] Preferably, the composite material is applied in the fields of metallurgy, mining, construction, machinery and power.

[0039] The method of the application firstly coats a coating layer composed of FeZr-ZTA-high manganese steel powder on the surface of ZTA ceramic particles, then further coats a high manganese steel coating layer on the basis to prepare a porous preform, and the construction of the double-layer gradient coating layer porous ZTA preform can effectively improve the wettability between the ZTA ceramic particles and the high manganese steel matrix and construct a metallurgical bonding interface, can reduce the difference between the ZTA and the high manganese steel in terms of Young's modulus and thermal expansion coefficient, and further improve the interface bonding strength and interface stability.

[0040] The mechanism of the application is as follows:

[0041] The application mixes Zr-Fe, ZTA micro powder and high manganese steel powder in a certain proportion by mechanical ball milling to obtain a mixed powder, coats the mixed powder on the surface of ZTA particles, and further coats a high manganese steel powder layer, that is, realizes double-layer coating on the surface of ZTA. Since the mixed powder layer contains ZTA micro powder and Zr-Fe alloy powder which have good wettability with ZTA, and also contains high manganese steel powder which has good wettability with high manganese steel, and the secondly coated high manganese steel powder can further improve the wettability with high manganese steel melt and reduce thermal shock, the introduction of the double-layer coating on the surface of ZTA ceramic particles can significantly improve the wettability between the ZTA ceramic particles and the high manganese steel melt during casting of the composite material, and can realize metallurgical interface bonding through component interdiffusion and limited in-situ interface reaction, so that the prepared ZTA ceramic particle reinforced high manganese steel composite material has excellent three-body wear resistance.

[0042] Compared with the prior art, the application has the following advantages and beneficial effects:

[0043] (1) The double-layer coating layer of FeZr-ZTA-high manganese steel ternary composite powder and high manganese steel powder constructed on the surface of ZTA has the dual effects of effectively improving the wettability between the ZTA ceramic particles and the high manganese steel melt and constructing a composite metallurgical bonding interface, and can efficiently realize strong interface bonding between the ZTA ceramic and the high manganese steel matrix.

[0044] (2) Based on the double-layer coating of ZTA ceramic particles, the ZTA ceramic porous preform prepared by low-cost pressureless sintering can effectively promote the penetration of high manganese steel melt and prevent the preform from collapsing under thermal shock.

[0045] (3) The raw materials used in this invention can all be purchased from the market, and the cost is low. The ZTA-reinforced high manganese steel-based composite material prepared has excellent performance, which is conducive to large-scale industrial production and engineering application. Attached Figure Description

[0046] Figure 1 A schematic diagram of the construction of the metallurgical bonding composite interface of ZTA ceramic particle reinforced high manganese steel composite material.

[0047] Figure 2 This is a morphology image of the ZTA porous preform prepared based on the double-layer coating of ZTA ceramic surface in Example 1.

[0048] Figure 3 This is a casting diagram of ZTA ceramic particle-reinforced high-manganese steel matrix composite material. Detailed Implementation

[0049] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.

[0050] Unless otherwise specified in the embodiments of this invention, conventional conditions or conditions recommended by the manufacturer shall apply. All raw materials and reagents used, unless otherwise specified, are commercially available products. The ball mill used in the embodiments is a YXQM planetary ball mill.

[0051] Example 1

[0052] (1) Take Zr-Fe powder with a purity of approximately 99.99% and an average particle size of 200 mesh (Zr in the Zr-Fe powder accounts for 60% of the mass of Zr), high manganese steel powder with an average particle size of 300 mesh, and ZTA micro powder with an average particle size of 3 micrometers. The weight percentages of Zr-Fe alloy powder, ZTA micro powder, and high manganese steel powder are 4:2:5. Add anhydrous ethanol (accounting for 15% of the total weight of the slurry) and perform mechanical ball milling to obtain a mixed powder slurry. The main ball milling parameters are: grinding ball diameter 5 mm, ball-to-powder ratio 5:1, rotation speed 250 r / min, ball milling time 640 min, and nitrogen as the protective atmosphere.

[0053] (2) Pour the mixed powder slurry obtained by ball milling in step (1) into a container, and then immerse the ultrasonically cleaned ZTA ceramic particles into it. The average particle size of the ZTA ceramic particles used is 10 mesh, and the weight ratio of ZTA ceramic particles to the composite powder in step (1) is 5:1. Stir continuously to make the ZTA particles coated by the slurry, then take them out and put them into a vacuum drying oven at 60℃ for 3 hours until the anhydrous ethanol is completely removed. The coated and dried ZTA particles are sintered at 1050℃ for 45 minutes in a nitrogen atmosphere, and then cooled to room temperature in the furnace to obtain single-layer coated ZTA particles.

[0054] (3) Mix high-manganese steel powder with an average particle size of 300 mesh with anhydrous ethanol to form a uniform slurry. Then add the ZTA particles with single-layer coating treatment in (2) to the slurry and stir continuously (by weight percentage, high-manganese steel powder accounts for 27%, anhydrous ethanol accounts for 20%, and the remainder is single-layer coated ZTA particles). Place the ZTA ceramic particles with the slurry coating on the surface into a corundum mold, and then vacuum dry at 60°C until all the anhydrous ethanol is removed. Finally, sinter at 1250°C for 120 min under a nitrogen protective atmosphere to obtain a ZTA porous ceramic preform. The mold size used is 40mm×60mm, and a layer of graphite paper is placed on the inner wall of the mold to facilitate demolding.

[0055] (4) The composite material was prepared by traditional sand casting. The prepared ZTA ceramic preform was fixed in the middle of the mold cavity with coarse iron wire. High manganese steel melt was poured into it. The temperature of the high manganese steel melt was controlled at 1550±20℃ and the casting temperature was controlled at 1500±20℃. Slag removal and deoxidation treatment were carried out before casting to obtain ZTA ceramic particle reinforced high manganese steel matrix composite material.

[0056] A schematic diagram of the composite interface structure in the prepared composite material is shown below. Figure 1 As shown. Three-body abrasive wear tests were conducted on ZTA ceramic particle-reinforced high-manganese steel matrix composites. The test parameters were: abrasive was #6 quartz sand, main rotation speed of the wear testing machine was 30 r / min, single wear time was 30 min (5 tests total, 150 min), load was 30 N, and the radius of the annular steel rail was 180 mm. Each sample underwent three wear tests, and the wear rate was the average of the three test results. The wear rate of the ZTA ceramic particle-reinforced high-manganese steel matrix composite was 0.57 mm. 3 ·min -1 .

[0057] Example 2

[0058] (1) Take Zr-Fe powder with purity of about 99.99%, average particle size of 300 mesh (Zr accounts for 30% of the mass percentage in the Zr-Fe powder), high manganese steel powder with average particle size of 400 mesh and micro powder with average particle size of 5 μm, and mechanically ball-mill mix them according to the weight ratio of Zr-Fe alloy powder: ZTA micro powder: high manganese steel powder = 8:6:6, add anhydrous ethanol (20% of the total weight of the slurry) to obtain a mixed powder slurry. The main ball-milling parameters are: ball diameter 10 mm, ball-to-material ratio 8:1, rotation speed 350 r / min, ball-milling time 300 min, and nitrogen gas is used as the protective atmosphere.

[0059] (2) Pour the mixed powder slurry obtained by ball-milling in step (1) into a container, then immerse the ZTA ceramic particles cleaned by ultrasonic waves in it, the ZTA ceramic particles used have an average particle size of 15 mesh, and the weight ratio of the ZTA ceramic particles to the composite powder in step (1) is 8:1, and continuously stir to make the ZTA particles wrapped by the slurry, then take out and put into a 80℃ vacuum drying oven for drying for 4h until the anhydrous ethanol is completely removed, sinter the ZTA particles after coating treatment and drying at 1100℃ for 60 min under nitrogen atmosphere, cool the furnace to room temperature and take out, to obtain single-layer coated ZTA particles.

[0060] (3) Mix the high manganese steel powder with an average particle size of 400 mesh with anhydrous ethanol to make a uniform slurry, then add the single-layer coated ZTA particles in step (2) to the slurry and continuously stir (the high manganese steel powder accounts for 20%, the anhydrous ethanol accounts for 25%, and the rest is the single-layer coated ZTA particles), put the ZTA ceramic particles wrapped with the slurry into a corundum mold, then vacuum dry at 80℃ until the anhydrous ethanol is completely removed, and finally sinter at 1450℃ under nitrogen protective atmosphere for 160 min to obtain a ZTA porous ceramic preform, and the morphology of the prepared preform is shown in Figure 2 The size of the mold used is 40 mm x 60 mm, and a layer of graphite paper is used on the inner wall of the mold to facilitate demolding.

[0061] (4) Use traditional sand casting to prepare the composite material, fix the prepared ZTA ceramic preform in the middle of the mold cavity with a coarse iron wire, pour the high manganese steel melt into it, control the temperature of the high manganese steel melt out of the furnace at 1510±35℃, and control the pouring temperature at 1500±20℃, and perform deslagging and deoxidation treatment before pouring to obtain a ZTA ceramic particle reinforced high manganese steel matrix composite material.

[0062] The morphology of the ZTA porous preform prepared based on the double-layer coating on the surface of the ZTA ceramic is shown in Figure 2The tri-body abrasive wear test was carried out, and the wear test parameters were as follows: the abrasive was 6# quartz sand, the main rotating speed of the wear tester was 30 r / min, the single wear time was 30 min (a total of 5 times, a total of 150 min), the load was 30 N, the radius of the ring-shaped steel rail was 180 mm, each sample was subjected to three wear tests, and the wear rate was the average value of the results of the three tests. The wear rate of the ZTA ceramic particle reinforced high manganese steel matrix composite was 0.71 mm 3 ·min -1 .

[0063] Example 3

[0064] (1) Zr-Fe powder with a purity of about 99.99% and an average particle size of 250 mesh (the mass percentage of Zr in the Zr-Fe powder was 40%), high manganese steel powder with an average particle size of 350 mesh, and ZTA micropowder with an average particle size of 4 μm were mixed by mechanical ball milling at a weight ratio of Zr-Fe alloy powder: ZTA micropowder: high manganese steel powder = 5:4:5, and anhydrous ethanol was added to mix the powder (25% of the total weight of the slurry), to obtain a mixed powder slurry. The main ball milling parameters were: ball diameter 10 mm, ball-to-material ratio 6:1, rotating speed 300 r / min, ball milling time 480 min, and a mixture of nitrogen and argon gas was used as the protective atmosphere.

[0065] (2) The mixed powder slurry obtained by ball milling in step (1) was poured into a container, and the ZTA ceramic particles cleaned by ultrasonic wave were immersed therein. The average particle size of the ZTA ceramic particles used was 12 mesh, and the weight ratio of the ZTA ceramic particles to the composite powder in step (1) was 6:1. The ZTA particles were continuously stirred to be wrapped by the slurry, and then were taken out and dried in a 80°C vacuum drying oven for 4 h until the anhydrous ethanol was completely removed. The ZTA particles after coating treatment and drying were sintered at 1100°C for 50 min under a nitrogen atmosphere, and were taken out after the furnace was cooled to room temperature, to obtain single-layer coated ZTA particles.

[0066] (3) The high manganese steel powder with an average particle size of 350 mesh was mixed with anhydrous ethanol to form a uniform slurry, and the single-layer coated ZTA particles in step (2) were added to the slurry and continuously stirred (the high manganese steel powder accounted for 25%, the anhydrous ethanol accounted for 21%, and the rest was the single-layer coated ZTA particles). The ZTA ceramic particles wrapped with the slurry were placed in a corundum mold, and then were vacuum dried at 80°C until the anhydrous ethanol was completely removed. Finally, the ZTA porous ceramic preform was obtained by pressureless sintering at 1400°C for 180 min under a nitrogen protective atmosphere. The size of the mold used was 40 mm x 60 mm, and a layer of graphite paper was placed on the inner wall of the mold to facilitate demolding.

[0067] (4) Using traditional sand casting to prepare the composite material, the prepared ZTA ceramic preform is fixed in the middle of the casting cavity with a thick iron wire, and the high manganese steel melt is poured into it. The pouring temperature of the high manganese steel melt is controlled at 1530±20℃, and the pouring temperature is controlled at 1500±20℃. The slag and deoxidation treatment is carried out before pouring to obtain the ZTA ceramic particle reinforced high manganese steel matrix composite material. The composite ingot is as shown in Figure 3 .

[0068] The ZTA ceramic particle reinforced high manganese steel matrix composite ingot is as shown in Figure 3 . After three-body abrasive wear test, the abrasive is 6# quartz sand, the main rotating speed of the wear testing machine is 30r / min, the single wear time is 30min (a total of 5 times, a total of 150min), the load is 30N, and the radius of the ring rail is 180mm. Each sample is subjected to three wear tests, and the average wear rate of the three tests is taken as the average value. The wear rate of the ZTA ceramic particle reinforced high manganese steel matrix composite material is 0.64mm 3 ·min -1 .

[0069] Example 4

[0070] (1) Take Zr-Fe powder with a purity of about 99.99% and an average particle size of 250 mesh (the mass percentage of Zr in the Zr-Fe powder is 45%), high manganese steel powder with an average particle size of 300 mesh, and ZTA micro powder with an average particle size of 4μm. The weight ratio of Zr-Fe alloy powder: ZTA micro powder: high manganese steel powder is 4:2:5, and anhydrous ethanol is added to mix the powder (15% of the total weight of the slurry). Mechanical ball milling is carried out to obtain a mixed powder slurry. The main ball milling parameters are: ball diameter 5mm, ball to material ratio 5:1, rotating speed 250r / min, ball milling time 360min, and nitrogen gas is used as the protective atmosphere.

[0071] (2) Pour the mixed powder slurry obtained by ball milling in step (1) into a container, and then immerse the ultrasonically cleaned ZTA ceramic particles in it. The average particle size of the ZTA ceramic particles used is 10 mesh, and the weight ratio of the ZTA ceramic particles to the composite powder in step (1) is 6:1. Stir constantly to make the ZTA particles wrapped by the slurry, then take out and put into a 70℃ vacuum drying oven for drying for 3h until the anhydrous ethanol is completely removed. The ZTA particles after coating treatment and drying are sintered at 1080℃ for 50min under nitrogen atmosphere, and then taken out after the furnace is cooled to room temperature to obtain single-layer coated ZTA particles.

[0072] (3) Take high manganese steel powder with average particle size of 350 mesh and mix with anhydrous ethanol to make a uniform slurry, then add the single-layer coated ZTA particles in (2) to the slurry and continuously stir (high manganese steel powder accounts for 26%, anhydrous ethanol accounts for 23%, and the rest is single-layer coated ZTA particles by weight percentage), place the ZTA ceramic particles coated with the slurry into a corundum mold, then vacuum dry at 70°C until all the anhydrous ethanol is removed, and finally sinter at 1300°C for 120 min under nitrogen atmosphere to obtain a ZTA porous ceramic preform. The mold size used is 40mm x 60mm, and a layer of graphite paper is placed on the inner wall of the mold to facilitate demolding.

[0073] (4) Use traditional sand casting to prepare the composite material, fix the prepared ZTA ceramic preform with coarse iron wire in the middle of the mold cavity, pour high manganese steel melt into it, control the temperature of the high manganese steel melt out of the furnace at 1550±20°C, and control the pouring temperature at 1500±20°C. Deoxidize and remove slag before pouring to obtain a ZTA ceramic particle reinforced high manganese steel matrix composite material.

[0074] After three-body abrasive wear test, the abrasive wear test parameters are: 6# quartz sand as abrasive, main rotating speed of abrasive wear tester is 30r / min, single wear time is 30min (total of 5 times, total of 150min), load is 30N, radius of ring rail is 180mm, each sample is tested for three times, wear rate is the average value of three test results, wear rate of ZTA ceramic particle reinforced high manganese steel matrix composite material is 0.67mm 3 ·min -1 .

[0075] Comparative Example 1

[0076] (1) Take Zr-Fe powder with purity of about 99.99% and average particle size of 200 mesh (Zr accounts for 60% of the mass percentage of Zr-Fe powder), high manganese steel powder with average particle size of 300 mesh, and ZTA micro powder with average particle size of 3μm, mix them according to the weight ratio of Zr-Fe alloy powder: ZTA micro powder: high manganese steel powder = 4:2:5, add anhydrous ethanol to mix the powder (15% of the total weight of the slurry), and mechanically ball mill to obtain a mixed powder slurry. Main ball milling parameters: ball diameter 5mm, ball to material ratio 5:1, rotating speed 250r / min, ball milling time 640min, and nitrogen gas as protective atmosphere.

[0077] (2) The mixed powder slurry obtained in step (1) is vacuum dried at 60°C for 3 hours until the anhydrous ethanol is completely evaporated, and then is directly coated with a water glass binder (25 wt.%) to coat the ZTA ceramic particles (ZTA particle size of 10 mesh). The weight ratio of the ZTA ceramic particles to the composite powder in step (1) is 5:1. Subsequently, the mixed ZTA particles are pressed into a mold, and a ceramic preform is formed by applying pressure. The preform is dried in a drying oven at 60°C for 3 hours, and then the formed ZTA ceramic preform is obtained. The size of the mold used is 40 mm x 60 mm, and a layer of graphite paper can be placed in the mold to facilitate demolding.

[0078] (3) The ZTA ceramic preform prepared is fixed in the middle of the cavity of the mold by using a coarse iron wire, and a high manganese steel is used as the casting melt. The temperature of the molten iron is controlled at 1550±20°C, and the pouring temperature is controlled at 1500±20°C. The slag and deoxidation treatment is performed before pouring, and a ZTA particle reinforced high manganese steel composite material is obtained.

[0079] The three-body abrasive wear test is performed, and the abrasive is 6# quartz sand. The main rotating speed of the wear testing machine is 30 r / min, the single wear time is 30 min (a total of 5 times, a total of 150 min), the load is 30 N, and the radius of the ring-shaped steel rail is 180 mm. Each sample is subjected to three wear tests, and the average value is taken as the final result. The wear rate of the ZTA ceramic particle reinforced high manganese steel composite material is 0.83 mm 3 ·min -1 .

[0080] Table 1 Three-body wear rate of the composite materials prepared in Examples 1-4 and Comparative Example 1

[0081]

[0082] As can be seen from Table 1, the wear resistance of the composite materials obtained in Examples 1-4 has certain differences, but is obviously better than that of the composite material prepared in Comparative Example 1.

[0083] The above examples are the preferred embodiments of the present application, but the embodiments of the present application are not limited by the above examples. Any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present application are equivalent replacement methods, and are included in the protection scope of the present application.

Claims

1. A method for preparing a porous preform of ZTA ceramic particles with double-layer coating, characterized in that, Includes the following steps: (1) Zr-Fe alloy powder, ZTA micro powder, high manganese steel powder and anhydrous ethanol are mixed by ball milling to obtain a mixed powder slurry; (2) Immerse the ZTA particles in the mixed powder slurry of step (1) so that the slurry coats the surface of the ZTA particles, remove the ZTA particles and dry them, and pre-sinter them at 1050-1100℃ to obtain single-layer coated ZTA particles. (3) Mix high manganese steel powder with anhydrous ethanol to obtain a slurry, and then immerse the single-layer coated ZTA particles obtained in step (2) into it so that the high manganese steel powder is uniformly coated on the surface of the single-layer coated ZTA particles. Take it out and dry it. Put the double-layer coated ZTA particles into a mold and perform pressureless sintering at 1250-1450℃ to obtain a double-layer coated modified porous ZTA ceramic preform. In step (1), the Zr-Fe alloy powder contains Zr at a mass percentage of 30% to 60%. The weight ratio of Zr-Fe alloy powder, ZTA micro powder and high manganese steel powder in step (1) is 4-8:2-6:5-6; In step (1), the anhydrous ethanol accounts for 15-25% of the slurry weight; The weight ratio of ZTA particles and coating layer mixed powder in step (2) is 5-8:1; In step (3), by weight percentage, high manganese steel powder accounts for 20-27%, anhydrous ethanol accounts for 20-25%, and the remainder is single-layer coated ZTA particles; The particle size of the Zr-Fe alloy powder in step (1) is 200-300 mesh; The particle size of the ZTA micro powder in step (1) is 3-5 micrometers; The particle size of the high manganese steel powder mentioned in steps (1) and (3) is 300-400 mesh; The ZTA particles in step (2) have a particle size of 10-15 mesh.

2. The preparation method according to claim 1, characterized in that, The pre-sintering time in step (2) is 45-60 min; The pressureless sintering time in step (3) is 120 to 180 minutes.

3. The preparation method according to claim 1, characterized in that, The ball milling in step (1) is a mechanical ball milling with a ball diameter of 5 to 10 mm, a weight ratio of the grinding ball to the mixed powder of 5:1 to 8:1, a rotation speed of 250 to 350 r / min, and a milling time of 300 to 640 min; The ball milling mixing in step (1), the pre-sintering in step (2), and the pressureless sintering in step (3) are all carried out in an inert gas atmosphere, wherein the inert gas is at least one of argon, helium, and nitrogen.

4. A double-layer coated modified ZTA ceramic particle porous preform prepared by the preparation method according to any one of claims 1 to 3.

5. The application of the double-layer coated modified ZTA ceramic particle porous preform of claim 4 in reinforced iron-based composite materials, characterized in that, Achieving metallurgical bonding at the interface between ZTA ceramics and iron-based matrix.

6. A method for preparing a double-layer coated modified ZTA ceramic particle porous preform reinforced high-manganese steel composite material, characterized in that, Includes the following steps: The porous preform of double-layer coated modified ZTA ceramic particles as described in claim 4 is fixed in the casting cavity, and high manganese steel melt is cast into the cavity to obtain a composite material with interfacial metallurgical bonding between ZTA ceramic and high manganese steel matrix. The high-manganese steel melt temperature is controlled at 1520-1570℃, and the casting temperature is controlled at 1500±20℃.

7. A double-layer coated modified ZTA ceramic particle porous preform reinforced high manganese steel composite material prepared by the preparation method of claim 6.

8. The application of the double-layer coated modified ZTA ceramic particle porous preform reinforced high manganese steel composite material as described in claim 7 in the fields of metallurgy, mining, construction, machinery and power.

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