Ni-al based metal bond diamond tool material containing ni al nanofiber and preparation method thereof

Abstract

The application provides a Ni-Al-based metal-bonded diamond tool material containing NiAl nanofibers and a preparation method thereof. The material contains the following raw material components in percentage by mass: 8-10% of diamond powder, 0.5-15% of Mg-Al alloy powder, 13.97-17.04% of Al powder, and 61.03-74.46% of Ni powder, and the total percentage by mass of the components is 100%. The preparation method comprises using Al powder, Ni powder and diamond powder as raw materials, using Mg-Al alloy powder as an additive, and using a self-propagating high-temperature synthesis method to prepare the material. The raw materials contain 8-10% of diamond powder, 0.5-15% of Mg-Al powder, 13.97-17.04% of Al powder and 61.03-74.46% of Ni powder in percentage by mass, and the total percentage by mass of the components is 100%. The preparation raw materials of the Ni-Al-based metal-bonded diamond tool material can play a synergistic effect. The composite material contains NiAl nanofibers, and the NiAl nanofibers are distributed between the diamond and the Ni-Al matrix, can fully play the bridging effect of nanowhiskers, and can effectively improve the mechanical properties of the Ni-Al-based metal-bonded diamond tool material.

Description

Technical Field

[0001] This invention belongs to the field of inorganic non-metallic materials technology, and relates to diamond tool materials, specifically to a Ni-Al based metal-bonded diamond tool material containing NiAl nanofibers and its preparation method. Background Technology

[0002] Diamond tool materials have gradually become an indispensable part of modern manufacturing. Ni-Al based bonded diamond tool materials can be used to process concrete, marble, and other building materials. However, Ni-Al based bonded diamond tool materials have low sintering energy efficiency, and because diamond is an inert material, bonding diamond to the matrix is ​​a technical challenge, limiting their applications. In existing technologies, when preparing Ni-Al based bonded diamond composite materials using a self-propagating high-temperature synthesis method, under conditions of 10% diamond mass content and a particle size of 150–180 μm, the bulk density of the resulting composite material is 3.28 g / cm³. 3 It has a compressive strength of 92.0 MPa and a Vickers hardness of 122.06 HV, which are relatively low in mechanical properties and make it difficult to meet the mechanical property requirements of composite materials under some working conditions.

[0003] Therefore, there is an urgent need to provide a method to improve the mechanical properties of Al-Ni / diamond through doping or alloying. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a Ni-Al based metal-bonded diamond tool material containing NiAl nanofibers and its preparation method, thereby solving the technical problem of low mechanical properties of Ni-Al based metal-bonded diamond tool materials in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A Ni-Al based metal-bonded diamond tool material containing NiAl nanofibers comprises the following raw material components by mass percentage: 8-10% diamond powder, 0.5-15% Mg-Al alloy powder, 13.97-17.04% Al powder, and 61.03-74.46% Ni powder, with the total mass percentage of each component being 100%.

[0007] The present invention also has the following technical features:

[0008] Specifically, the NiAl nanofibers contained in the Ni-Al based metal-bonded diamond tool material have a length of 3-5 μm and a diameter of 190-210 nm.

[0009] Furthermore, the Ni-Al based metal-bonded diamond tool material has a compressive strength of 235.09–268.61 MPa and a Rockwell hardness of 33.6–44.8 HRB.

[0010] Furthermore, by weight percentage, it includes the following raw material components: 10% diamond powder, 0.5% Mg-Al alloy powder, 16.67% Al powder, and 72.83% Ni powder.

[0011] Furthermore, in the Mg-Al alloy powder, the mass percentage of Mg powder is 90-95%, and the mass percentage of Al is 5-10%.

[0012] Furthermore, the diamond powder has a particle size of 80-100 mesh, the Al powder has a particle size of 300-600 mesh, the Ni powder has a particle size of 300-600 mesh, and the magnesium-aluminum alloy has a particle size of 300-600 mesh.

[0013] This invention also protects a method for preparing Ni-Al based metal-bonded diamond tool materials containing NiAl nanofibers, comprising using Al powder, Ni powder and diamond powder as raw materials, Mg-Al alloy powder as an additive, and a self-propagating high-temperature synthesis method.

[0014] The raw materials, by mass percentage, contain 8-10% diamond powder, 0.5-15% Mg-Al alloy powder, 13.97-17.04% Al powder, and 61.03-74.46% Ni powder, with the total mass percentage of each component being 100%.

[0015] Furthermore, the method specifically includes the following steps:

[0016] Step 1: Mix the nickel powder and aluminum powder of the specified amount evenly, add the diamond powder and Mg-Al alloy powder of the specified amount, and hand mix in a mortar for 0.9 to 1.5 hours to obtain the mixed powder;

[0017] Step 2: Place the mixed powder obtained in Step 1 into a powder tablet press and press it into a cylindrical blank;

[0018] Step 3: Place the cylindrical blank into a self-propagating high-temperature synthesis furnace, and induce a self-propagating high-temperature synthesis reaction in the cylindrical blank using an igniter to obtain Ni-Al based metal-bonded diamond tool material containing NiAl nanofibers.

[0019] The diamond powder comprises 8-10% by mass, the Mg-Al alloy powder comprises 0.5-15%, the Al powder comprises 13.97-17.04%, and the Ni powder comprises 61.03-74.46%, with the total mass percentage of each component being 100%.

[0020] In the Mg-Al alloy powder, the mass percentage of Mg powder is 90-95%, and the mass percentage of Al is 5-10%.

[0021] Furthermore, the igniter mentioned in step 3 includes a C-Ti igniter, which is prepared by compounding carbon powder and titanium powder, wherein the molar ratio of carbon powder and titanium powder is 1:(1~1.5).

[0022] Furthermore, the self-propagating high-temperature synthesis reaction is carried out in a vacuum environment with a vacuum degree of 0.95 MPa and a reaction time of approximately 20–30 seconds.

[0023] Compared with the prior art, the present invention has the following technical effects:

[0024] (I) The raw materials for preparing Ni-Al based metal-bonded diamond tool materials provided by this invention can exert a synergistic effect, resulting in NiAl nanofibers in the composite material. These NiAl nanofibers are distributed between the diamond and the Ni-Al matrix, fully utilizing the bridging effect of the nanofibers, thereby effectively improving the mechanical properties of the Ni-Al based metal-bonded diamond tool materials.

[0025] (II) The preparation method provided by this invention uses Al powder, Ni powder, and diamond powder as raw materials and Mg-Al alloy as additives. It adopts a self-propagating high-temperature synthesis method to prepare Ni-Al based metal-bonded diamond tool materials containing NiAl nanofibers. The reaction is rapid and complete, the preparation process is simple and economical, the production cost is greatly reduced, and energy consumption is reduced, making it more energy-saving and environmentally friendly. The obtained composite material has a compressive strength of 235.09-268.61 MPa and a Rockwell hardness of 33.6-44.8 HRB, and has excellent mechanical properties such as high strength, high toughness, and impact resistance.

[0026] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Attached Figure Description

[0027] Figure 1 The image shows the XRD pattern of the Ni-Al based metal-bonded diamond tool material prepared in Example 1.

[0028] Figure 2 SEM image of the Ni-Al based metal-bonded diamond tool material prepared in Example 1;

[0029] Figure 3 This is the XRD pattern of the Ni-Al based metal-bonded diamond tool material prepared in Example 2;

[0030] Figure 4 SEM image of the Ni-Al based metal-bonded diamond tool material prepared in Example 2;

[0031] Figure 5 This is the XRD pattern of the Ni-Al based metal-bonded diamond tool material prepared in Example 3;

[0032] Figure 6 Here is a SEM image of the Ni-Al based metal-bonded diamond tool material prepared in Example 3;

[0033] Figure 7 The image shows the XRD pattern of the Ni-Al based metal-bonded diamond tool material prepared in Example 4.

[0034] Figure 8 SEM image of the Ni-Al based metal-bonded diamond tool material prepared in Example 4;

[0035] Figure 9 This is the XRD pattern of the Ni-Al based metal-bonded diamond tool material prepared in Example 5;

[0036] Figure 10 SEM image of the Ni-Al based metal-bonded diamond tool material prepared in Example 5;

[0037] Figure 11 This is the XRD pattern of the Ni-Al based metal-bonded diamond tool material prepared in Example 6;

[0038] Figure 12 This is a SEM image of the Ni-Al based metal-bonded diamond tool material prepared in Example 6;

[0039] Figure 13 This is the XRD pattern of the Ni-Al based metal-bonded diamond tool material prepared in Example 7;

[0040] Figure 14 This is a SEM image of the Ni-Al based metal-bonded diamond tool material prepared in Example 7;

[0041] Figure 15 The image shows the XRD pattern of the Ni-Al based metal-bonded diamond tool material prepared in Comparative Example 1.

[0042] Figure 16 The image shows a SEM image of the Ni-Al based metal-bonded diamond tool material prepared in Comparative Example 1.

[0043] Figure 17 The image shows the XRD pattern of the Ni-Al based metal-bonded diamond tool material prepared in Comparative Example 2.

[0044] Figure 18 The image shows a SEM image of the Ni-Al based metal-bonded diamond tool material prepared in Comparative Example 2.

[0045] Figure 19 The image shows the XRD pattern of the Ni-Al based metal-bonded diamond tool material prepared in Comparative Example 3.

[0046] Figure 20 The image shows a SEM image of the Ni-Al based metal-bonded diamond tool material prepared in Comparative Example 3. The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0047] It should be noted that, unless otherwise specified, all raw materials and equipment used in this invention are those known in the prior art.

[0048] The inventive concept of this invention is as follows: Mg-Al alloys have high vapor pressure, and the formation of a gaseous phase during combustion synthesis facilitates the generation of nanofibers. These nanofibers possess a large specific surface area, allowing them to bond well with the matrix material when incorporated into combustion-synthesized Al-Ni-based bonded diamond tool materials. Furthermore, the nanofibers exhibit excellent bending and tensile properties, enabling them to connect the matrix material and facilitate pull-out in combustion-synthesized Ni-Al-based bonded diamond tool materials, thereby improving the structural density of the Al-Ni-based bonded diamond tool materials. The nanofibers also play a role in absorbing and transferring destructive energy during crack propagation. In addition, the nanofibers can fill the pore structure of combustion-synthesized Ni-Al-based bonded diamond tool materials, refining the pore size and effectively improving the compressive strength and hardness of the materials.

[0049] This invention provides a Ni-Al based metal-bonded diamond tool material containing NiAl nanofibers, comprising the following raw material components by mass percentage: 8-10% diamond powder, 0.5-15% Mg-Al alloy powder, 13.97-17.04% Al powder, and 61.03-74.46% Ni powder, with the total mass percentage of each component being 100%.

[0050] Preferably, the NiAl nanofibers contained in the Ni-Al based metal-bonded diamond tool material have a length of 3-5 μm and a diameter of 190-210 nm.

[0051] Preferably, the Ni-Al based metal-bonded diamond tool material has a compressive strength of 235.09–268.61 MPa and a Rockwell hardness of 33.6–44.8 HRB.

[0052] Preferably, in the Mg-Al alloy powder, the mass percentage of Mg powder is 90-95%, and the mass percentage of Al is 5-10%.

[0053] Preferably, the diamond powder has a particle size of 80-100 mesh, the Al powder has a particle size of 300-600 mesh, the Ni powder has a particle size of 300-600 mesh, and the magnesium-aluminum alloy has a particle size of 300-600 mesh.

[0054] The present invention also provides a method for preparing Ni-Al based metal-bonded diamond tool material containing NiAl nanofibers, comprising using Al powder, Ni powder and diamond powder as raw materials, Mg-Al alloy powder as additive, and obtaining it by a self-propagating high-temperature synthesis method;

[0055] The raw materials, by mass percentage, comprise 8-10% diamond powder, 0.5-15% Mg-Al alloy powder, 13.97-17.04% Al powder, and 61.03-74.46% Ni powder, with the total mass percentage of each component being 100%.

[0056] Specifically, the following steps are included:

[0057] Step 1: Mix the nickel powder and aluminum powder of the specified amount evenly, add the diamond powder and Mg-Al alloy powder of the specified amount, and hand mix in a mortar for 0.9 to 1.5 hours to obtain the mixed powder;

[0058] Step 2: Place the mixed powder obtained in Step 1 into a powder tablet press and press it into a cylindrical blank;

[0059] Step 3: Place the cylindrical blank into a self-propagating high-temperature synthesis furnace, and induce a self-propagating high-temperature synthesis reaction in the cylindrical blank using an igniter to obtain Ni-Al based metal-bonded diamond tool material containing NiAl nanofibers.

[0060] The diamond powder comprises 8-10% by mass, the Mg-Al alloy powder comprises 0.5-15%, the Al powder comprises 13.97-17.04%, and the Ni powder comprises 61.03-74.46%, with the total mass percentage of each component being 100%.

[0061] In the Mg-Al alloy powder, the mass percentage of Mg powder is 90-95%, and the mass percentage of Al is 5-10%.

[0062] Preferably, the igniter includes a C-Ti igniter, which is prepared by compounding carbon powder and titanium powder, wherein the molar ratio of carbon powder to titanium powder is 1:(1~1.5).

[0063] Preferably, the self-propagating high-temperature synthesis reaction is carried out in a vacuum environment with a vacuum degree of 0.95 MPa and a reaction time of approximately 20–30 s.

[0064] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0065] Example 1:

[0066] Following the above technical solution, this embodiment provides a Ni-Al based metal-bonded diamond tool material containing NiAl nanofibers, prepared using Al powder (purity ≥99.0%), Ni powder (purity ≥99.0%), and diamond powder (80-100 mesh) as raw materials, and Mg-Al alloy as an additive. The content of each component in the raw materials, by mass percentage, is as follows: Al powder 16.67%, Ni powder 72.83%, diamond powder 10%, and Mg-Al alloy powder 0.5%. The preparation method is as follows:

[0067] Step 1: Mix the above raw materials evenly, and then hand mix them in a mortar for 0.9 to 1.5 hours to obtain a mixed powder;

[0068] Step 2: Place the mixed powder obtained in Step 1 into a powder press and press it into a cylindrical blank with a diameter of 20 mm. After molding, demold the sample and place it in a self-propagating high-temperature reactor. Place C-Ti igniter on the cylindrical blank to initiate a self-propagating high-temperature synthesis reaction. After vacuuming, ignite the sample to initiate a self-propagating high-temperature synthesis reaction. After the furnace temperature drops to room temperature, turn off the power, open the furnace door, and take out the material to obtain Ni-Al based metal-bonded diamond tool material. The material has a relatively regular appearance and a small number of microcracks on the surface.

[0069] Performance testing

[0070] The Ni-Al based metal-bonded diamond tool material prepared in this embodiment was analyzed by XRD and FESEM, and the results are as follows: Figure 1 and Figure 2 As shown in the figure, the Ni-Al based metal-bonded diamond tool material contains Ni-Al nanofibers with a length of approximately 3–5 μm and a diameter of approximately 200 nm. Testing revealed that the Ni-Al based metal-bonded diamond tool material prepared in this embodiment contains Ni3Al, NiAl, and Ni. The compressive strength of the Ni-Al based metal-bonded diamond tool material is 235.09 MPa, and its Rockwell hardness is 33.6 HRB.

[0071] The Ni-Al based metal-bonded diamond tool material of this embodiment can be used to prepare cutting tools and abrasives.

[0072] Example 2

[0073] This embodiment discloses a Ni-Al based metal-bonded diamond tool material made of NiAl nanofibers. The raw material composition and preparation steps of the diamond tool material are the same as those in Example 1, except that the raw material composition ratio is different. In this embodiment, by mass percentage, Al powder is 16.67%, raw material Ni powder is 72.83%, diamond powder is 10%, and Mg-Al alloy is 1%.

[0074] The preparation steps in this embodiment are the same as in Example 1, and the final result is a Ni-Al based metal-bonded diamond tool material with a relatively regular appearance and a small number of microcracks on the surface.

[0075] The performance testing method in this embodiment is basically the same as that in Embodiment 1.

[0076] The Ni-Al based metal-bonded diamond tool material prepared in this embodiment was analyzed by XRD and FESEM, and the results are as follows: Figure 3 and Figure 4 As shown, the Ni-Al based metal-bonded diamond tool material prepared in this embodiment contains Ni-Al nanofibers with a length of about 3 to 5 μm and a diameter of about 200 nm.

[0077] Testing revealed that the Ni-Al based metal-bonded diamond tool material prepared in this embodiment contains Mg2Ni, Ni3Al, NiAl, and Ni. The Ni-Al based metal-bonded diamond tool material has a compressive strength of 268.61 MPa and a Rockwell hardness of 44.8 HRB.

[0078] Example 3

[0079] This embodiment discloses a Ni-Al based metal-bonded diamond tool material based on NiAl nanofibers. The raw material composition and preparation steps of the diamond tool material are the same as in Example 1, except for the different raw material component ratios. In this embodiment, by mass percentage, Al powder is 16.48%, raw Ni powder is 72.02%, diamond powder is 10%, and Mg-Al alloy is 1.5%. The preparation steps of this embodiment are the same as in Example 1, and the final result is a Ni-Al based metal-bonded diamond tool material, but the sample surface shows more severe cracking.

[0080] The performance testing method in this embodiment is basically the same as that in Embodiment 1.

[0081] The Ni-Al based metal-bonded diamond tool material prepared in this embodiment was analyzed by XRD and FESEM, and the results are as follows: Figure 5 and Figure 6As shown, the Ni-Al based metal-bonded diamond tool material prepared in this embodiment contains Ni-Al nanofibers, but the amount of nanofibers generated is reduced. The length of the nanofibers is about 3 to 5 μm and the diameter is about 200 nm.

[0082] Testing revealed that the Ni-Al based metal-bonded diamond tool material prepared in this embodiment contains AlMg, Mg2Ni, Ni3Al, NiAl, and Ni. The Ni-Al based metal-bonded diamond tool material has a compressive strength of 203.56 MPa and a Rockwell hardness of 38.6 HRB.

[0083] Example 4

[0084] This embodiment discloses a Ni-Al based metal-bonded diamond tool material made of NiAl nanofibers. The raw material composition and preparation steps of the diamond tool material are the same as those in Example 1, except that the raw material composition ratio is different. In this embodiment, by mass percentage, Al powder is 16.2%, raw material Ni powder is 70.8%, diamond powder is 10%, and Mg-Al alloy is 3%.

[0085] The performance testing method in this embodiment is basically the same as that in Embodiment 1.

[0086] The Ni-Al based metal-bonded diamond tool material prepared in this embodiment was analyzed by XRD and FESEM, and the results are as follows: Figure 7 and Figure 8 As shown, the Ni-Al based metal-bonded diamond tool material prepared in this embodiment contains Ni-Al nanofibers with a length of about 2 to 3 μm and a diameter of about 300 to 500 nm.

[0087] Testing revealed that the Ni-Al based metal-bonded diamond tool material prepared in this embodiment contains AlMg, Mg2Ni, Ni3Al, NiAl, and Ni. The Ni-Al based metal-bonded diamond tool material fractured in the middle, making it impossible to measure the mechanical properties of the sample.

[0088] Example 5

[0089] This embodiment discloses a Ni-Al based metal-bonded diamond tool material made of NiAl nanofibers. The raw material composition and preparation steps of the diamond tool material are the same as those in Example 1, except that the raw material composition ratio is different. In this embodiment, by mass percentage, Al powder is 19.83%, raw material Ni powder is 69.17%, diamond powder is 10%, and Mg-Al alloy is 5%.

[0090] The performance testing method in this embodiment is basically the same as that in Embodiment 1.

[0091] The Ni-Al based metal-bonded diamond tool material prepared in this embodiment was analyzed by XRD and FESEM, and the results are as follows: Figure 9 and Figure 10 As shown, the Ni-Al based metal-bonded diamond tool material prepared in Example 5 contains Ni-Al nanorods with a length of approximately 0–2 μm and a diameter of approximately 300–700 nm. Analysis revealed that the Ni-Al based metal-bonded diamond tool material prepared in this example contains AlMg, Mg2Ni, Ni3Al, and NiAl.

[0092] Ni-Al based metal-bonded diamond tool material fractured, making it impossible to measure the mechanical properties of the sample.

[0093] Example 6

[0094] This embodiment discloses a Ni-Al based metal-bonded diamond tool material made of NiAl nanofibers. The raw material composition and preparation steps of the diamond tool material are the same as those in Example 1, except that the raw material composition ratio is different. In this embodiment, by mass percentage, Al powder is 14.9%, raw material Ni powder is 65.1%, diamond powder is 10%, and Mg-Al alloy is 10%.

[0095] The performance testing method in this embodiment is basically the same as that in Embodiment 1.

[0096] The Ni-Al based metal-bonded diamond tool material prepared in this embodiment was analyzed by XRD and FESEM, and the results are as follows: Figure 11 and Figure 12 As shown, the Ni-Al based metal-bonded diamond tool material prepared in this embodiment contains a small amount of Ni-Al nanocrystals, with a length of approximately 0–2 μm and a diameter of approximately 200–300 nm. Testing revealed that the Ni-Al based metal-bonded diamond tool material prepared in this embodiment contains AlMg, Mg2Ni, Ni3Al, and NiAl. The Ni-Al based metal-bonded diamond tool material fractured, making it impossible to measure the mechanical properties of the sample.

[0097] Example 7

[0098] This embodiment discloses a Ni-Al based metal-bonded diamond tool material made of NiAl nanofibers. The raw material composition and preparation steps of the diamond tool material are the same as those in Example 1, except that the raw material composition ratio is different. In this embodiment, by mass percentage, Al powder is 13.97%, raw material Ni powder is 61.03%, diamond powder is 10%, and Mg-Al alloy is 15%.

[0099] The performance testing method in this embodiment is basically the same as that in Embodiment 1.

[0100] The Ni-Al based metal-bonded diamond tool material prepared in this embodiment was analyzed by XRD and FESEM, and the results are as follows: Figure 13 and Figure 14 As shown, the Ni-Al based metal-bonded diamond tool material prepared in this embodiment contains very few Ni-Al nanocrystals, with a length of about 0 to 2 μm and a diameter of about 200 to 300 nm.

[0101] Testing revealed that the Ni-Al based metal-bonded diamond tool material prepared in this embodiment contains AlMg, Mg2Ni, Ni3Al, and NiAl. The Ni-Al based metal-bonded diamond tool material fractured, making it impossible to measure the mechanical properties of the sample.

[0102] Comparative Example 1

[0103] This comparative example provides a diamond tool material. The difference between this comparative example and Example 1 is that Mg-Al alloy powder is not added to the raw material components. By mass percentage, the proportions of each raw material component in this example are: Al powder 16.76%, Ni powder 73.24%, and diamond powder 10%.

[0104] The performance testing method for this comparative example is basically the same as that for Example 1.

[0105] XRD and FESEM analyses were performed on the Ni-Al based metal-bonded diamond tool material prepared in this comparative example. The results showed that the Ni-Al based metal-bonded diamond tool material prepared in this comparative example did not contain Ni-Al nanofibers. The diamond tool material had a compressive strength of 92.0 MPa and a Rockwell hardness of less than 20 HRB, indicating low mechanical properties that were difficult to meet the mechanical property requirements of composite materials under some working conditions.

[0106] Comparative Example 2

[0107] This comparative example provides a diamond tool material. The raw material composition used in this comparative example is the same as that in Example 1. The difference is that this comparative example uses a traditional sintering method.

[0108] The performance testing method for this comparative example is basically the same as that for Example 1.

[0109] XRD and FESEM analyses were performed on the Ni-Al based metal-bonded diamond tool material prepared in this comparative example. The results showed that the Ni-Al based metal-bonded diamond tool material prepared in this comparative example did not contain Ni-Al nanofibers. The compressive strength of the diamond tool material was 134.6 MPa, and the Rockwell hardness was 30.4 HRB. The mechanical properties were relatively low.

[0110] Comparative Example 3

[0111] This comparative example provides a diamond tool material. The difference between this comparative example and Example 1 is that this comparative example uses a traditional sintering method, and the content of each raw material component is different. In this comparative example, Al powder is 16.67%, raw material Ni powder is 72.83%, diamond powder is 10%, and Mg-Al alloy is 1%.

[0112] The performance testing method for this comparative example is basically the same as that for Example 1.

[0113] XRD and FESEM analyses were performed on the Ni-Al based metal-bonded diamond tool material prepared in this comparative example. The results showed that the Ni-Al based metal-bonded diamond tool material prepared in this comparative example did not contain Ni-Al nanofibers. The compressive strength of the diamond tool material was 160.4 MPa, and the Rockwell hardness was 34.8 HRB. The mechanical properties were relatively low.

[0114] Analysis of the various indicators of Examples 1-7 and Comparative Examples 1-3 reveals that:

[0115] The self-propagating high-temperature synthesis method and the incorporation of Mg-Al alloy are the key conditions for generating nanofibers with high aspect ratio in the Al-Ni-based bonded diamond tool material provided by this invention. When the incorporation of Mg-Al alloy is less than or equal to 1 wt%, the generation of nanofibers in the synthesized Al-Ni-based bonded diamond tool material is good, and the compressive strength and Rockwell hardness of the tool material are excellent.

[0116] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

Claims

1. A Ni-Al based metal-bonded diamond tool material containing NiAl nanofibers, characterized in that, The raw material components, by mass percentage, include the following: diamond powder 8~10%, Mg-Al alloy powder 0.5~15%, Al powder 13.97~17.04%, Ni powder 61.03~74.46%, and the total mass percentage of each component is 100%. The NiAl nanofibers contained in the Ni-Al based metal-bonded diamond tool material have a length of 3~5μm and a diameter of 190~210nm. The compressive strength of the Ni-Al based metal-bonded diamond tool material is 235.09~268.61 MPa, and the Rockwell hardness is 33.6~44.8 HRB.

2. The Ni-Al based metal-bonded diamond tool material containing NiAl nanofibers as described in claim 1, characterized in that, By weight percentage, it includes the following raw material components: 10% diamond powder, 0.5% Mg-Al alloy powder, 16.67% Al powder, and 72.83% Ni powder.

3. The Ni-Al based metal-bonded diamond tool material containing NiAl nanofibers as described in claim 1, characterized in that, In the Mg-Al alloy powder, the mass percentage of Mg powder is 90-95%, and the mass percentage of Al is 5-10%.

4. The Ni-Al based metal-bonded diamond tool material containing NiAl nanofibers as described in claim 1, characterized in that, The diamond powder has a particle size of 80-100 mesh, the Al powder has a particle size of 300-600 mesh, the Ni powder has a particle size of 300-600 mesh, and the Mg-Al alloy powder has a particle size of 300-600 mesh.

5. The method for preparing Ni-Al based metal-bonded diamond tool material containing NiAl nanofibers as described in any one of claims 1 to 4, characterized in that, It is prepared by a self-propagating high-temperature synthesis method using Al powder, Ni powder and diamond powder as raw materials and Mg-Al alloy powder as additives. The raw materials, by mass percentage, contain 8-10% diamond powder, 0.5-15% Mg-Al alloy powder, 13.97-17.04% Al powder, and 61.03-74.46% Ni powder, with the total mass percentage of each component being 100%.

6. The preparation method according to claim 5, characterized in that, Specifically, the following steps are included: Step 1: Mix the nickel powder and aluminum powder of the specified amount evenly, add the diamond powder and Mg-Al alloy powder of the specified amount, and hand mix in a mortar for 0.9~1.5 h to obtain the mixed powder; Step 2: Place the mixed powder obtained in Step 1 into a powder tablet press and press it into a cylindrical blank; Step 3: Place the cylindrical blank into a self-propagating high-temperature synthesis furnace, and induce a self-propagating high-temperature synthesis reaction in the cylindrical blank using an igniter to obtain Ni-Al based metal-bonded diamond tool material containing NiAl nanofibers. The diamond powder comprises 8-10% by mass percentage, the Mg-Al alloy powder comprises 0.5-15% by mass percentage, the Al powder comprises 13.97-17.04% by mass percentage, and the Ni powder comprises 61.03-74.46% by mass percentage, with the total mass percentage of each component being 100%. In the Mg-Al alloy powder, the mass percentage of Mg powder is 90-95%, and the mass percentage of Al is 5-10%.

7. The preparation method according to claim 6, characterized in that, The igniter mentioned in step 3 includes a C-Ti igniter, which is prepared by compounding carbon powder and titanium powder, and the molar ratio of carbon powder to titanium powder is 1:(1~1.5).

8. The preparation method according to claim 6, characterized in that, The self-propagating high-temperature synthesis reaction is carried out in a vacuum environment with a vacuum degree of 0.95 MPa and a reaction time of 20-30 s.

Images