A BN-Mo2B high-temperature wear-resistant material and its preparation process

Abstract

The present invention provides a BN-Mo2B high-temperature wear-resistant material and a preparation process thereof, and relates to the technical field of high-temperature wear-resistant materials. The preparation process of the BN-Mo2B high-temperature wear-resistant material comprises the following steps: first mixed ball milling: weighing Mo powder and B powder according to a molar ratio of a:b and loading them into a ball mill for ball milling for 5 to 20 hours to obtain a first mixed powder, wherein a is 2 and b is in the range of 1 to 1.6; second mixed ball milling: loading BN powder at a temperature of 80 to 100°C and the first mixed powder into a ball mill for ball milling for 10 to 30 hours to obtain a second mixed powder, wherein the weight of the BN powder is 5% to 20% of the weight of the first mixed powder; sintering: placing the second mixed powder cooled to room temperature in a plasma activated sintering furnace for sintering, and keeping the temperature at a sintering temperature of 1000 to 1400°C and a pressure of 300 to 500 MPa for 0.5 to 3 hours to finally obtain the BN-Mo2B material. The BN-Mo2B material produced by this preparation process has low cost and excellent high-temperature wear resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature wear-resistant materials, and in particular to a BN-Mo2B high-temperature wear-resistant material and a preparation process thereof. Background Art

[0002] Wear, corrosion, and fracture are the three main forms of material failure. Wear and tear contributes significantly to the annual GDP of industries such as steel, metallurgy, and building materials. High-temperature wear-resistant materials account for a significant portion of this total. However, existing high-temperature wear-resistant materials are expensive to prepare, and their high-temperature wear resistance still needs to be improved. Summary of the Invention

[0003] The purpose of the present invention includes providing a BN-Mo2B high-temperature wear-resistant material and a preparation process thereof, so as to solve the technical problems that the preparation cost of existing high-temperature wear-resistant materials is high and their high-temperature wear-resistant performance needs to be improved.

[0004] To solve the above problems, the present invention provides a preparation process of BN-Mo2B high temperature wear-resistant material, comprising the following steps:

[0005] First mixed ball milling: Mo powder and B powder are weighed in a molar ratio of a:b and loaded into a ball mill for 5 to 20 hours to obtain a first mixed powder, wherein a is 2 and b is in the range of 1 to 1.6;

[0006] Second mixed ball milling: BN powder at a temperature of 80-100°C and the first mixed powder are charged into a ball mill and ball milled for 10-30 hours to obtain a second mixed powder, wherein the weight of the BN powder is 5%-20% of the weight of the first mixed powder;

[0007] Sintering: The second mixed powder cooled to room temperature is placed in a plasma activated sintering furnace for sintering at a sintering temperature of 1000-1400° C. and a pressure of 300-500 MPa for 0.5-3 h to finally obtain a BN-Mo2B material.

[0008] Optionally, the value range of b is 1.2 to 1.5; more preferably, it is 1.2 to 1.3.

[0009] Optionally, in the first mixed ball milling step, the weighed Mo powder and B powder are placed in a ball milling jar, and anhydrous ethanol is added to the ball milling jar, and the weight of the anhydrous ethanol is 0.4% to 0.6% of the total weight of the Mo powder and the B powder, and then the ball milling jar is placed in a ball mill for ball milling.

[0010] Optionally, before the ball mill jar is loaded into the ball mill, the ball mill jar is evacuated and an inert gas is introduced.

[0011] Optionally, the ball-to-material ratio in the ball mill is in the range of 1:8 to 1:4; more preferably 1:7 to 1:5; and even more preferably 1.6.

[0012] Optionally, in the first mixing and ball milling step, the average particle size of the Mo powder and the B powder is no more than 200 μm, and the purity of the Mo powder and the B powder is no less than 99%;

[0013] And / or, in the second mixing and ball milling step, the average particle size of the BN powder is 50 to 500 nm.

[0014] Optionally, the preparation process further includes a BN powder processing step: adding BN powder and analytical grade acetone into a water bath, maintaining the water bath temperature at 30-45°C for cleaning for 5-10 minutes; taking out the cleaned BN powder and drying it, and cooling the dried BN powder to 80-100°C for use in the second mixing ball milling step.

[0015] Optionally, in the sintering step, after the second mixed powder is placed in a plasma activated sintering furnace, the plasma activated sintering furnace is heated to a sintering temperature of 1000 to 1400° C. at a rate of 2 to 10° C. / s.

[0016] Optionally, in the sintering step, after obtaining the BN-Mo2B material, the BN-Mo2B material is allowed to cool naturally to room temperature in the furnace.

[0017] The present invention also provides a BN-Mo2B high-temperature wear-resistant material, which is prepared by adopting the above preparation process.

[0018] The preparation process provided by the present invention has, on the one hand, a simple preparation process, and the raw materials Mo powder, B powder and BN powder are inexpensive, and the ineffective consumption of each raw material in the preparation process is low, thereby effectively reducing the preparation cost of the BN-Mo2B material; on the other hand, the preparation process takes less time to prepare the BN-Mo2B material, has high preparation efficiency and large output, and can further reduce the preparation cost of the BN-Mo2B material; on the other hand, the preparation process adds BN grains with excellent hardness performance to the Mo2B material to obtain a dense BN-Mo2B material, and the BN grains can form a high-temperature wear-resistant dense scaffold in the Mo2B material, so that the BN-Mo2B material can have high hardness and wear resistance under high-temperature working conditions, thereby being suitable for high-temperature wear working conditions.

[0019] In the BN-Mo2B high-temperature wear-resistant material provided in this embodiment, BN grains can form a high-temperature wear-resistant dense scaffold in the Mo2B material, so that the BN-Mo2B material can have high hardness and wear resistance under high-temperature conditions, thus being suitable for high-temperature wear conditions; at the same time, the preparation process is simple, time-saving, and efficient; the raw materials Mo powder, B powder, and BN powder are inexpensive, and the preparation process has low ineffective consumption of each raw material, thereby effectively reducing the preparation cost of the BN-Mo2B material and correspondingly reducing the price of the BN-Mo2B material. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0021] Figure 1 This is a metallographic photograph of the BN-Mo2B material prepared according to the preparation process of Example 1 of the present invention. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] This embodiment provides a preparation process of a BN-Mo2B high-temperature wear-resistant material, including a first mixing ball milling step, a second mixing ball milling step, and a sintering step, as follows:

[0024] First mixed ball milling: Mo powder and B powder are weighed according to a molar ratio of a:b and loaded into a ball mill for ball milling for 5 to 20 hours to obtain a first mixed powder, wherein a is 2 and b is 1 to 1.6. Mo powder and B powder weighed according to the molar ratio are loaded into a ball mill and ball milled for 5 to 20 hours to obtain a uniformly mixed first mixed powder, specifically Mo2B powder, in which the B powder is evenly distributed on the surface of the Mo powder. Specifically, as the ball milling time increases, the distribution of the B powder on the Mo powder surface becomes more uniform, and the prepared Mo2B grains become finer. The finer the Mo2B grains, the higher their resistance to high-temperature wear. The ball milling time can be determined based on different wear conditions. The value of b is preferably in the range of 1.2 to 1.5; more preferably 1.2 to 1.3. If the value of b is determined to be not less than 1.2, the Mo powder and B powder at a molar ratio of 2:1 after ball milling can fully react to form Mo2B, and the excess amount of B powder in the molar ratio is used as the loss margin during the ball milling process (the lighter B powder will partially adhere to the ball mill body or grinding balls during the ball milling process, resulting in certain losses). Specifically, the value of b can be 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, and any value between the two value points.

[0025] Second mixed ball milling: BN powder at a temperature of 80-100°C and the first mixed powder are charged into a ball mill and ball milled for 10-30 hours to obtain a second mixed powder, wherein the weight of the BN powder is 5%-20% of the weight of the first mixed powder. BN grains have excellent hardness and high-temperature wear resistance. After ball milling to obtain the first mixed powder, BN powder at a temperature of 80-100°C is added to the first mixed powder and ball milling is continued for 10-30 hours to obtain a uniformly mixed second mixed powder. The BN powder at a temperature of 80-100°C has a high surface activity. Adding the BN powder with high surface activity to the ball milling jar and ball milling with the first mixed powder effectively improves the interaction between the BN powder and the Mo2B powder, thereby significantly shortening the ball milling time while obtaining the target second mixed powder, thereby effectively improving preparation efficiency. Among them, the temperature of BN powder is preferably 85°C to 95°C; more preferably 90°C; specifically, the temperature of BN powder can be 80°C, 82°C, 84°C, 86°C, 88°C, 90°C, 92°C, 94°C, 96°C, 98°C, 100°C, and any temperature value between the two value points.

[0026] The weight of BN powder added is 5% to 20% of the weight of the first mixed powder, which can largely ensure the full interaction of BN powder and Mo2B powder, improve the utilization rate of BN powder and Mo2B powder, and reduce their ineffective consumption. The weight percentage of BN powder relative to the first mixed powder is preferably 10% to 15%, and more preferably 12% to 13%. Specifically, the weight percentage of BN powder relative to the first mixed powder can be 5%, 7%, 9%, 11%, 13%, 15%, 17%, 19%, 20%, and any weight percentage in between. Specifically, as the ball milling time increases, the mixing uniformity of BN powder and Mo2B powder increases, the scaffold formed by BN powder in Mo2B powder becomes denser, and the high-temperature wear resistance strength increases. The ball milling time can be determined according to different wear conditions.

[0027] Sintering: The second mixed powder, cooled to room temperature, is placed in a plasma activated sintering furnace for sintering at a sintering temperature of 1000-1400°C and a pressure of 300-500 MPa for 0.5-3 hours to finally obtain the BN-Mo2B material. The second mixed powder, which is uniformly mixed and cooled to room temperature, is placed in a plasma activated sintering furnace with high sintering efficiency for 0.5-3.0 hours at a sintering temperature of 1000-1400°C and a pressure of 300-500 MPa to obtain a dense BN-Mo2B material. The BN grains can form a dense, high-temperature wear-resistant scaffold in the Mo2B material, enabling the BN-Mo2B material to have high hardness and wear resistance under high-temperature conditions. The sintering temperature may preferably be 1100-1300°C, more preferably 1150-1250°C. Specifically, the sintering temperature may be 1050°C, 1100°C, 1150°C, 1200°C, 1250°C, 1300°C, 1350°C, 1400°C, or any temperature value in between. The pressure may preferably be 350-450 MPa, more preferably 380-420 MPa. Specifically, the pressure may be 300 MPa, 340 MPa, 380 MPa, 420 MPa, 460 MPa, 500 MPa, or any pressure in between. Among them, the insulation time is preferably 1.0 to 2.5 hours; more preferably 1.5 to 2.0 hours; specifically, the insulation time can be 0.5 hours, 1.0 hours, 1.5 hours, 2.0 hours, 2.5 hours, 3.0 hours, and any insulation time between the two value points.

[0028] The preparation process provided in this embodiment, on the one hand, is simple in the preparation process, the raw materials Mo powder, B powder and BN powder are inexpensive, and the ineffective consumption of each raw material in the preparation process is low, thereby effectively reducing the preparation cost of the BN-Mo2B material; on the other hand, the preparation process takes less time to prepare the BN-Mo2B material, has high preparation efficiency and large output, and can further reduce the preparation cost of the BN-Mo2B material; on the other hand, the preparation process adds BN grains with excellent hardness performance to the Mo2B material to obtain a dense BN-Mo2B material, and the BN grains can form a high-temperature wear-resistant dense scaffold in the Mo2B material, so that the BN-Mo2B material can have high hardness and wear resistance under high-temperature conditions, thereby being suitable for high-temperature wear conditions.

[0029] Specifically, in this embodiment, in the first mixed ball milling step, the average particle size of the Mo powder and the B powder is no more than 200 μm, and the purity of the Mo powder and the B powder is no less than 99%. Selecting Mo powder and B powder with an average particle size of less than or equal to 200 μm for ball milling can efficiently complete the mixing and obtain a first mixed powder with an appropriate particle size, thereby improving the ball milling efficiency and shortening the ball milling time. The average particle size of the Mo powder and the B powder is preferably 150 μm to 200 μm, and more preferably 170 μm to 180 μm. Specifically, the average particle size of the Mo powder and the B powder can be 150 μm, 155 μm, 160 μm, 165 μm, 170 μm, 175 μm, 180 μm, 185 μm, 190 μm, 195 μm, 200 μm, and particle sizes between the two value points. Among them, the selection of Mo powder and B powder with a purity of not less than 99% can ensure the purity of the generated Mo2B powder, thereby ensuring the high-temperature wear resistance of the final BN-Mo2B material.

[0030] Specifically, in the second mixing and ball milling step, the average particle size of the BN powder is 50-500 nm. Selecting BN powder of this particle size for mixing and ball milling with the first mixed powder allows for efficient mixing and produces a second mixed powder of the appropriate particle size, thereby ensuring the density and uniformity of the BN grains forming a scaffold within the Mo2B material in the subsequent sintering of the BN-Mo2B material, and correspondingly ensuring the high-temperature wear resistance of the resulting BN-Mo2B material. The average particle size of the BN powder is preferably 150-400 nm, more preferably 250-300 nm. Specifically, the average particle size of the BN powder can be 50 nm, 100 nm, 150 nm, 200 nm, 250 nm, 300 nm, 350 nm, 400 nm, 450 nm, 500 nm, and any size in between.

[0031] Optionally, in this embodiment, in the first mixed ball milling step, the weighed Mo powder and B powder are placed in a ball milling jar, and anhydrous ethanol is added to the jar, with the weight of the anhydrous ethanol being 0.4% to 0.6% of the total weight of the Mo powder and B powder. The jar is then placed in a ball mill for ball milling. After the Mo powder and B powder are weighed according to the molar ratio, they are placed in the ball milling jar with a certain amount of anhydrous ethanol for wet milling. This improves the ball milling efficiency, shortens the ball milling time, and can produce a first mixed powder with higher particle size uniformity, thereby producing a Mo2B powder with more uniform and stable properties. After the first mixed powder is obtained by ball milling, the ball mill can be turned off, the ball milling jar can be removed and opened, the anhydrous ethanol can be evaporated, and the first mixed powder can be naturally cooled to room temperature in the ball milling jar. Among them, the weight of anhydrous ethanol added to the ball mill is preferably 0.45% to 0.55% of the total weight of Mo powder and B powder; more preferably 0.5%; specifically, the weight of anhydrous ethanol can be 0.4%, 0.43%, 0.45%, 0.48%, 0.50%, 0.53%, 0.55%, 0.58%, 0.60% of the total weight of Mo powder and B powder, and any weight ratio between the two value points.

[0032] In this embodiment, the ball-to-material ratio in the ball mill is in the range of 1:8 to 1:4; more preferably, 1:7 to 1:5; and even more preferably, 1:6. Selecting this ball-to-material ratio allows for efficient ball milling and produces a first mixed powder of suitable particle size. Specifically, the ball-to-material ratio can be 1:8, 1:7, 1:6, 1:5, 1:4, or any value in between.

[0033] Specifically, before the ball mill is loaded into the ball mill, the ball mill can be evacuated and an inert gas can be introduced into the ball mill. Select a ball mill that can be evacuated and aerated. After Mo powder, B powder and anhydrous ethanol are loaded into the ball mill, the ball mill is evacuated and an inert gas is introduced into the ball mill to form an inert atmosphere. The ball mill is then loaded into the ball mill for ball milling. This reduces the risk of Mo powder and B powder being oxidized by contact with oxygen during the ball milling process, thereby affecting the amount and purity of Mo2B, and correspondingly ensuring the output and purity of Mo2B. Specifically, inert gas can be selected from cheap Ar. Alternatively, the weighing and loading of Mo powder and B powder should be as quick as possible to reduce the risk of Mo powder and B powder being oxidized by contact with air and absorbing moisture.

[0034] In this embodiment, the preparation process also includes a BN powder treatment step before the second ball-milling step: BN powder and analytical-grade acetone are added to a water bath and washed at 30-45°C for 5-10 minutes. The washed BN powder is removed and dried, and then cooled to 80-100°C for use in the second ball-milling step. Commercial BN powder can be used and then washed in a water bath with analytical-grade acetone to improve its purity. After washing, the BN powder is removed from the water bath and dried in a drying oven at a specific temperature of 100-120°C to quickly evaporate the acetone in the BN powder, resulting in a higher-purity BN powder. After drying, the BN powder is naturally cooled to 80-100°C in the drying oven for use in the second ball-milling step. The BN powder treatment step not only improves the purity of the BN powder, thereby reducing impurities in the resulting BN-Mo2B material and ensuring its high-temperature wear resistance, but also allows the dried BN powder to cool naturally to 80-100°C for use in the second mixed ball milling step, eliminating the need for additional heating. This improves the operational convenience and reduces production costs of the process while ensuring production efficiency and final product performance. The water bath temperature is preferably 35-40°C, more preferably 37-38°C. Specifically, the water bath temperature can be 30°C, 32°C, 35°C, 38°C, 40°C, 42°C, 45°C, or any temperature in between. The cleaning time is preferably 6-9 minutes, more preferably 7-8 minutes. Specifically, the cleaning time can be 5 minutes, 6 minutes, 7 minutes, 8 minutes, 9 minutes, 10 minutes, or any other time in between.

[0035] Optionally, in this embodiment, during the sintering step, after the second mixed powder is placed in a plasma activated sintering furnace, the plasma activated sintering furnace is heated to a sintering temperature of 1000-1400°C at a rate of 2-10°C per second. When sintering the second mixed powder, the plasma activated sintering furnace is controlled to heat up to the target sintering temperature at an appropriate rate to reduce the adverse effects of heating too fast or too slow on the reaction, thereby ensuring the high-temperature wear resistance of the final product. The heating rate is preferably 4-8°C / s; more preferably 5-7°C / s; specifically, the heating rate can be 2°C / s, 3°C / s, 4°C / s, 5°C / s, 6°C / s, 7°C / s, 8°C / s, 9°C / s, 10°C / s, and any heating rate between the two value points.

[0036] Specifically, in this embodiment, in the sintering step, after obtaining the BN-Mo2B material, the BN-Mo2B material is allowed to cool naturally to room temperature in the furnace.

[0037] This embodiment also provides a BN-Mo2B high-temperature wear-resistant material produced using the above-mentioned preparation process. In the BN-Mo2B high-temperature wear-resistant material produced using the above-mentioned preparation process, BN grains can form a dense, high-temperature wear-resistant scaffold within the Mo2B material, enabling the BN-Mo2B material to exhibit high hardness and wear resistance under high-temperature conditions, making it suitable for high-temperature wear conditions. Furthermore, the preparation process is simple, time-efficient, and highly efficient. The raw materials, Mo powder, B powder, and BN powder, are inexpensive, and the preparation process consumes little ineffective material. This effectively reduces the preparation cost of the BN-Mo2B material, and accordingly reduces its price.

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0039] Example 1

[0040] Step 1: weighing Mo powder and B powder with an average particle size of 200 μm and a purity of 99% in a molar ratio of 2:1.2;

[0041] Step 2: The Mo powder and B powder weighed in step 1 are placed in a ball mill, and anhydrous ethanol with a weight of 0.5% of the total weight of the Mo powder and the B powder is added to the ball mill, and the ball-to-material ratio of the ball mill is 1:6; the ball mill is evacuated and Ar is introduced; the ball mill is placed in a ball mill and ball milled for 5 hours to obtain a first mixed powder, and the first mixed powder is naturally cooled to room temperature;

[0042] Step 3: Place commercial BN powder with an average particle size of 50 nm in a water bath and add analytical grade acetone, maintaining the water bath temperature at 30° C. for 5 minutes; remove the washed BN powder and dry it in a vacuum drying oven at 120° C. After drying, cool it to 80° C. in the drying oven;

[0043] Step 4: Add the 80°C BN powder obtained in Step 3 to the ball mill after Step 2, evacuate the ball mill, and introduce Ar, wherein the weight of the BN powder is 5% of the total weight of the first mixed powder; place the ball mill in a ball mill, and mill for 30 hours to obtain a second mixed powder, and then naturally cool the second mixed powder to room temperature;

[0044] Step 5: Fill the second mixed powder obtained in step 4 into a graphite mold and place it in a plasma activated sintering furnace, heat it to 1400°C at a rate of 2°C / s, pressurize it to 300MPa, and keep it warm for 0.5h; after sintering, cool it in the furnace to finally obtain BN-Mo2B material.

[0045] Figure 1 This is a metallographic photograph of the BN-Mo2B material prepared according to Example 1 of the present invention, showing an accuracy of 20 μm. Figure 1The bright white dots in the figure are BN grains with high hardness. The BN grains form a uniformly distributed hard scaffold in the dense BN-Mo2B material, which makes the BN-Mo2B material have excellent high-temperature wear resistance.

[0046] Specifically, the BN-Mo2B material prepared in Example 1 of the present invention and the existing "stellite" alloy were placed in a 900°C high-temperature wear tester for high-temperature wear tests. After 2 hours of wear, the volume loss of the two materials is shown in Table 1. Among them, the volume loss of the BN-Mo2B material prepared in Example 1 of the present invention is more than twice that of the existing "stellite" alloy, and its high-temperature wear resistance is better.

[0047] Table 1

[0048] "Stellite" alloy <![CDATA[BN-Mo2B material]]> <![CDATA[Volume loss (mm 3 / h)]]> 13.1 4.2

[0049] Example 2

[0050] Step 1: weighing Mo powder and B powder with an average particle size of 150 μm and a purity of 99.5% in a molar ratio of 2:1.5;

[0051] Step 2: The Mo powder and B powder weighed in step 1 are placed in a ball mill, and anhydrous ethanol with a weight of 0.5% of the total weight of the Mo powder and the B powder is added to the ball mill, and the ball-to-material ratio of the ball mill is 1:6; the ball mill is evacuated and Ar is introduced; the ball mill is placed in a ball mill and ball milled for 20 hours to obtain a first mixed powder, and the first mixed powder is naturally cooled to room temperature;

[0052] Step 3: Place commercial BN powder with an average particle size of 500 nm in a water bath and add analytical grade acetone, maintaining the water bath temperature at 45°C for 10 minutes; remove the washed BN powder and dry it in a vacuum drying oven at 120°C. After drying, cool it to 100°C in the drying oven;

[0053] Step 4: Add the 100°C BN powder obtained in Step 3 to the ball mill after Step 2, evacuate the ball mill, and introduce Ar, wherein the weight of the BN powder is 15% of the total weight of the first mixed powder; place the ball mill in a ball mill, and mill for 10 hours to obtain a second mixed powder, and then naturally cool the second mixed powder to room temperature;

[0054] Step 5: Fill the second mixed powder obtained in step 4 into a graphite mold and place it in a plasma activated sintering furnace, heat it to 1000°C at a rate of 10°C / s, pressurize it to 500MPa, and keep it warm for 3h; after sintering, cool it in the furnace to finally obtain BN-Mo2B material.

[0055] Specifically, the BN-Mo2B material prepared in Example 2 of the present invention and the existing "Stellite" alloy were placed in a 900°C high-temperature wear tester for high-temperature wear tests. After 2 hours of wear, the volume loss of the two materials is shown in Table 2. Among them, the volume loss of the BN-Mo2B material prepared in Example 2 of the present invention is nearly 3 times lower than that of the existing "Stellite" alloy, and its high-temperature wear resistance is better.

[0056] Table 2

[0057] "Stellite" alloy <![CDATA[BN-Mo2B material]]> <![CDATA[Volume loss (mm 3 / h)]]> 13.1 3.7

[0058] Example 3

[0059] Step 1, weighing Mo powder and B powder with an average particle size of no more than 100 μm and a purity of 99.5% in a molar ratio of 2:1.3;

[0060] Step 2: The Mo powder and B powder weighed in step 1 are placed in a ball mill, and anhydrous ethanol with a weight of 0.5% of the total weight of the Mo powder and the B powder is added to the ball mill, and the ball-to-material ratio of the ball mill is 1:6; the ball mill is evacuated and Ar is introduced; the ball mill is placed in a ball mill and ball milled for 15 hours to obtain a first mixed powder, and the first mixed powder is naturally cooled to room temperature;

[0061] Step 3: Place commercial BN powder with an average particle size of 250 nm in a water bath and add analytical grade acetone, maintaining the water bath temperature at 40° C. for 8 minutes; remove the washed BN powder and dry it in a vacuum drying oven at 120° C. After drying, cool it to 90° C. in the drying oven;

[0062] Step 4: Add the 90°C BN powder obtained in Step 3 to the ball mill after Step 2, evacuate the ball mill, and introduce Ar, wherein the weight of the BN powder is 20% of the total weight of the first mixed powder; place the ball mill in a ball mill, and mill for 20 hours to obtain a second mixed powder, and then naturally cool the second mixed powder to room temperature;

[0063] Step 5: Fill the second mixed powder obtained in step 4 into a graphite mold and place it in a plasma activated sintering furnace, heat it to 1200°C at a rate of 7°C / s, pressurize it to 400 MPa, and keep it warm for 2.5 hours; after sintering, cool it in the furnace to finally obtain the BN-Mo2B material.

[0064] Specifically, the BN-Mo2B material prepared in Example 3 of the present invention and the existing "Stellite" alloy were placed in a 900°C high-temperature wear tester for high-temperature wear tests. After 2 hours of wear, the volume loss of the two materials is shown in Table 3. Among them, the volume wear of the BN-Mo2B material prepared in Example 1 of the present invention is more than twice that of the existing "Stellite" alloy, and its high-temperature wear resistance is better.

[0065] Table 3

[0066] "Stellite" alloy <![CDATA[BN-Mo2B material]]> <![CDATA[Volume loss (mm 3 / h)]]> 13.1 4.0

[0067] In summary, the BN-Mo2B material prepared by the preparation process provided by the present invention has better high-temperature wear resistance; in addition, the cost of preparing the BN-Mo2B material by the preparation process provided by the present invention is about 60% of that of the "Stellite" alloy, which has a better cost-effectiveness advantage.

[0068] Finally, it should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0069] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A preparation process of BN-Mo2B high temperature wear-resistant material, characterized in that: The following steps are involved: First mixed ball milling: Mo powder and B powder are weighed in a molar ratio of a:b and loaded into a ball mill for 5 to 20 hours to obtain a first mixed powder, wherein a is 2 and b is in the range of 1 to 1.6; Second mixed ball milling: BN powder at a temperature of 80-100°C and the first mixed powder are charged into a ball mill and ball milled for 10-30 hours to obtain a second mixed powder, wherein the weight of the BN powder is 5%-20% of the weight of the first mixed powder; Sintering: The second mixed powder cooled to room temperature is placed in a plasma activated sintering furnace for sintering at a sintering temperature of 1000-1400° C. and a pressure of 300-500 MPa for 0.5-3 h to finally obtain a BN-Mo2B material.

2. The preparation process according to claim 1, characterized in that The value range of b is 1.2 to 1.

5.

3. The preparation process according to claim 1, characterized in that The value range of b is 1.2 to 1.

3.

4. The preparation process according to claim 1, characterized in that In the first mixed ball milling step, the weighed Mo powder and B powder are placed in a ball milling jar, and anhydrous ethanol is added to the ball milling jar, and the weight of the anhydrous ethanol is 0.4% to 0.6% of the total weight of the Mo powder and the B powder. Then, the ball milling jar is placed in a ball mill for ball milling.

5. The preparation process according to claim 4, characterized in that: Before the ball mill jar is loaded into the ball mill, the ball mill jar is evacuated and an inert gas is introduced into the jar.

6. The preparation process according to claim 4, characterized in that: The ball-to-material ratio in the ball mill is in the range of 1:8 to 1:

4.

7. The preparation process according to claim 4, characterized in that: The ball-to-material ratio in the ball mill is in the range of 1:7 to 1:

5.

8. The preparation process according to claim 4, characterized in that The ball-to-material ratio in the ball mill is in the range of 1:

6.

9. The preparation process according to claim 1, characterized in that: In the first mixing and ball milling step, the average particle size of the Mo powder and the B powder is no more than 200 μm, and the purity of the Mo powder and the B powder is no less than 99%; And / or, in the second mixing and ball milling step, the average particle size of the BN powder is 50 to 500 nm.

10. The preparation process according to claim 1, characterized in that: The preparation process also includes a BN powder processing step: adding BN powder and analytical grade acetone to a water bath, maintaining the water bath temperature at 30-45°C for cleaning for 5-10 minutes; removing the cleaned BN powder and drying it, and cooling the dried BN powder to 80-100°C for use in the second mixing ball milling step.

11. The preparation process according to claim 1, characterized in that: In the sintering step, after the second mixed powder is placed in a plasma activated sintering furnace, the plasma activated sintering furnace is heated to a sintering temperature of 1000 to 1400° C. at a rate of 2 to 10° C. / s.

12. The preparation process according to claim 1, characterized in that: In the sintering step, after the BN-Mo2B material is obtained, the BN-Mo2B material is allowed to cool naturally to room temperature in the furnace.

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