Ni-al based metal bonded diamond tool material, preparation method and application

Abstract

The application provides a preparation method of a Ni-Al-based metal-bonded diamond tool material, and the method comprises the following steps: step 1, using Al powder, Ni powder and diamond powder as raw materials, using Cu powder or Sn powder or Cu-Sn alloy powder as an additive, and obtaining a preliminary blank under one-way pressing at a pressure of 90-110 MPa; step 2, placing the preliminary blank in a cold isostatic pressing machine and pressing the preliminary blank into a blank body under a pressure of 140-160 MPa; and step 3, placing the blank body in a self-propagating high-temperature synthesis device to perform self-propagating reaction, and obtaining the Ni-Al-based metal-bonded diamond tool material; wherein in the step 1, the diamond powder is 8-11%, the additive is 2.5-45%, the Al powder is 8.37-16.29%, the Ni powder is 36.63-71.21%, and the mass percentages of the components are 100% in total. According to the in-situ synthesis theory, the method adopts a one-way pressure forming combined with an isostatic pressing forming mode, and the Ni-Al-based metal-bonded diamond tool material is prepared by using the self-propagating high-temperature synthesis technology under the condition of adding the additives Cu and Sn. The preparation process is simple and economical, the energy consumption is low, the production cost is greatly reduced, and the method is more energy-saving and environment-friendly.

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, its preparation method, and its application. Background Technology

[0002] Metal-bonded diamond tools are widely used in the machining of various hard and brittle materials, such as ceramics, glass, concrete, and stone, due to their high bonding strength, good formability, and long service life. With the development of modern manufacturing, the demand for efficient, precise, and high-quality machining tools is increasing. Ni-Al based bonded diamond tool materials can be used to machine concrete, marble, and other building materials. However, the existing Ni-Al based bonded diamond tool materials have relatively low mechanical properties, which cannot meet the requirements of certain working conditions, limiting their application. Furthermore, diamond is an inert material, and its bonding with the matrix remains a technical challenge.

[0003] In summary, there is an urgent need to develop new methods for preparing diamond tool materials to improve the bonding strength between diamond and the matrix, enhance the mechanical properties of diamond tool materials, and meet the requirements of industrial production for high-performance diamond tool materials. 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, its preparation method, and its application, thereby solving the technical problem of low mechanical properties in existing Ni-Al based metal-bonded diamond tool materials.

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

[0006] A method for preparing Ni-Al based metal-bonded diamond tool material, the method comprising the following steps:

[0007] Step 1: Using Al powder, Ni powder and diamond powder as raw materials, and Cu powder or Sn powder or Cu-Sn alloy powder as additives, the initial billet is obtained by unidirectional pressing under a pressure of 90-110 MPa.

[0008] Step 2: Place the initial billet in a cold isostatic press and press it into a billet body under a pressure of 140-160 MPa;

[0009] Step 3: Place the green body in a self-propagating high-temperature synthesis device to carry out a self-propagating reaction, and the product is obtained;

[0010] In step 1, the diamond powder is 8%–11%, the additives are 2.5%–45%, the Al powder is 8.37%–16.29%, and the Ni powder is 36.63%–71.21%, with the total mass percentage of each component being 100%.

[0011] The present invention also has the following technical features:

[0012] Specifically, in the Cu-Sn alloy powder, by mass percentage, Cu powder accounts for 80-85% and Sn powder accounts for 15-20%.

[0013] Furthermore, in step 1, by mass percentage, diamond powder is 10%, Sn powder is 2.5%, Al powder is 16.29%, and Ni powder is 71.21%.

[0014] Furthermore, in step 1, by mass percentage, diamond powder is 10%, Cu powder is 10%, Al powder is 14.90%, and Ni powder is 65.10%.

[0015] Furthermore, in step 1, by mass percentage, diamond powder is 10%, Al powder is 13.97%, Ni powder is 61.03%, Cu powder is 10%, and Sn powder is 5%.

[0016] Furthermore, the temperature of the self-propagating reaction is 1200–1426 K, and the time is 20–30 s.

[0017] Furthermore, the method includes the following steps:

[0018] Step 1: Using Al powder, Ni powder and diamond powder as raw materials, and Cu powder or Sn powder or Cu-Sn alloy powder as additives, the initial billet is obtained by unidirectional pressing under a pressure of 90MPa.

[0019] Step 2: Place the initial billet in a cold isostatic press and press it into a billet body under a pressure of 150MPa;

[0020] Step 3: Place the green body in a self-propagating high-temperature synthesis device to carry out a self-propagating reaction, and the product is obtained;

[0021] In step 1, the composition by mass percentage is as follows: diamond powder 10%, Al powder 16.29%, Ni powder 71.21%, and Sn powder 2.5%.

[0022] The self-propagating reaction is carried out at a temperature of 1200–1426 K for 20–30 s.

[0023] This invention also protects a Ni-Al based metal-bonded diamond tool material, which is prepared by the method described above for preparing Ni-Al based metal-bonded diamond tool materials;

[0024] The Ni-Al based metal-bonded diamond tool material contains, by mass percentage, the following components: 8%–11% diamond powder, 2.5%–45% additives, 8.37%–16.29% Al powder, and 36.63%–71.21% Ni powder, with the total mass percentage of each component being 100%.

[0025] Furthermore, the bulk density of the Ni-Al based metal-bonded diamond tool material is 4.90–5.97 g / cm³. 3 The apparent porosity is 12.43%–36.15%, and the Rockwell hardness is 70–96.3 HRB.

[0026] This invention also protects the use of the Ni-Al based metal-bonded diamond tool material described above for the preparation of cutting tools or abrasives.

[0027] Compared with the prior art, the present invention has the following technical effects:

[0028] (1) The method of the present invention is based on the in-situ synthesis theory and adopts a molding method of unidirectional pressure forming combined with isostatic pressing. With the addition of additives Cu and Sn, Ni-Al based metal bonded diamond tool materials are prepared by self-propagating high temperature synthesis technology. The preparation process is simple and economical, with low energy consumption and greatly reduced production costs, making it more energy-saving and environmentally friendly.

[0029] (2) The bulk density of the Ni-Al based metal-bonded diamond tool material provided by this invention is 4.90–5.97 g / cm³. 3 With an apparent porosity of 12.43%–36.15% and a Rockwell hardness of 70–96.3 HRB, diamond tool materials are dense, have high bulk density, low porosity, and possess excellent mechanical properties such as high strength, high toughness, and impact resistance.

[0030] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, all raw materials and equipment used in this invention are those known in the prior art.

[0032] The inventive concept of this invention is to prepare Ni-Al based metal-bonded diamond tool materials by using a combination of unidirectional pressure molding and isostatic pressing through a self-propagating high-temperature synthesis technology.

[0033] The addition of Cu, Sn, or Cu-Sn alloys significantly increases the flexural strength of the Ni-Al matrix. Specifically, when the Cu content is 30%, the flexural strength increases from 426 MPa to 754 MPa. This is because a chemical bond is formed in the Ni-Al-based metal-bonded diamond tool material, enabling the flexural strength to reach over 700 MPa. The self-propagating high-temperature synthesis method employed in this invention has the advantages of low cost, high energy efficiency, high purity of reaction products, fast reaction rate, and high synthesis temperature.

[0034] This invention provides a method for preparing Ni-Al based metal-bonded diamond tool materials, the method comprising the following steps:

[0035] Step 1: Using Al powder, Ni powder and diamond powder as raw materials, and Cu powder or Sn powder or Cu-Sn alloy powder as additives, the initial billet is obtained by unidirectional pressing under a pressure of 90-110 MPa.

[0036] Preferably, by mass percentage, diamond powder is 8%–11%, additives are 2.5%–45%, Al powder is 8.37%–16.29%, Ni powder is 36.63%–71.21%, and the total mass percentage of all components is 100%.

[0037] Preferably, in the Cu-Sn alloy powder, Cu powder accounts for 80-85% and Sn powder accounts for 15-20% by mass percentage.

[0038] Step 2: Place the initial billet in a cold isostatic press and press it into a billet body under a pressure of 140-160 MPa;

[0039] Step 3: Place the green body in a self-propagating high-temperature synthesis device to carry out a self-propagating reaction, and the product is obtained;

[0040] Preferably, the temperature of the self-propagating reaction is 1200–1426 K and the time is 20–30 s.

[0041] 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.

[0042] Example 1

[0043] Following the above technical solution, this embodiment provides a method for preparing Ni-Al based metal-bonded diamond tool material. The method uses Al powder (purity ≥99.0%), Ni powder (purity ≥99.0%), and diamond powder (150-180μm) as raw materials. The mass percentage of each raw material component is as follows: diamond powder 10%, Al powder 16.29%, Ni powder 71.21%, and Sn powder 2.5%.

[0044] The preparation method specifically includes the following steps:

[0045] Step 1: Place the specified amounts of Al powder, Ni powder, diamond powder, and Sn powder into a YES-600 universal pressure testing machine and press them into a cylindrical blank with a diameter of 20mm using a pressure of 90MPa.

[0046] Step 2: Place the initial billet into a CIP200 / 1000-300MPa cold isostatic press and press it into a billet body under a pressure of 150MPa;

[0047] Step 3: Place the billet in a self-propagating high-temperature synthesis device for a self-propagating reaction. After the furnace temperature drops to room temperature, turn off the power, open the furnace door, and take out the material, which is the Ni-Al based metal-bonded diamond tool material.

[0048] The physical and mechanical properties of the diamond tool material prepared in this embodiment were measured, and the test results were as follows: bulk density 4.92 g / cm³. 3 It has a porosity of 20.35% and a Rockwell hardness of 72.6 HRB.

[0049] The Ni-Al based metal-bonded diamond tool material prepared in this embodiment can be used to prepare cutting tools or abrasives.

[0050] Example 2

[0051] This embodiment provides a method for preparing Ni-Al based metal-bonded diamond tool material. The preparation steps are basically the same as in Example 1, except that the proportions of each component are different. In this embodiment, the mass percentages of each raw material component are: diamond powder 10%, Sn 10%, Al powder 14.90%, and Ni powder 65.10%. The final product is a Ni-Al based metal-bonded diamond tool material.

[0052] Performance testing:

[0053] The physical and mechanical properties of the diamond tool material prepared in this embodiment were measured, and the bulk density was found to be 5.02 g / cm³. 3 It has an apparent porosity of 20.15% and a Rockwell hardness of 75.7 HRB.

[0054] Example 3

[0055] This embodiment provides a method for preparing Ni-Al based metal-bonded diamond tool material. The preparation steps are basically the same as in Example 1, except that the proportions of each component are different. In this embodiment, the mass percentages of each raw material component are: diamond powder 10%, Cu powder 10%, Al powder 14.90%, and Ni powder 65.10%. Other experimental parameters and preparation steps are the same as in Example 1, and the Ni-Al based metal-bonded diamond tool material is finally obtained.

[0056] Performance testing:

[0057] The physical and mechanical properties of the diamond tool material prepared in this embodiment were measured, and the bulk density was found to be 5.34 g / cm³. 3 It has a porosity of 15.32% and a Rockwell hardness of 91.20 HRB.

[0058] Example 4

[0059] The raw material ratio and preparation steps used in this embodiment are basically the same as those in Example 1. The only difference is the different proportions of each group. In this embodiment, the proportions of each group are: 10% diamond powder, 13.97% Al powder, 61.03% Ni powder, 10% Cu powder and 5% Sn powder, and finally Ni-Al based metal bonded diamond tool material is obtained.

[0060] Performance testing:

[0061] The surface of the Ni-Al based metal-bonded diamond tool material sample prepared in this embodiment has microcracks.

[0062] The physical and mechanical properties of the diamond tool material prepared in this embodiment were measured, and the test results showed that the bulk density was 5.75 g / cm³. 3 It has a porosity of 15.61% and a Rockwell hardness of 88.7 HRB.

[0063] Example 5

[0064] This embodiment provides a method for preparing Ni-Al based metal-bonded diamond tool material. The preparation steps are basically the same as those in Example 1, except that the proportions of each component are different. In this embodiment, the mass percentages of each raw material component are: diamond powder 10%, Al powder 8.37%, Ni powder 36.63%, Cu additive 40%, and Sn 5%, finally yielding Ni-Al based metal-bonded diamond tool material.

[0065] Performance testing:

[0066] The Ni-Al based metal-bonded diamond tool material sample prepared in this embodiment exhibited surface cracks. The physical and mechanical properties of the tool material were tested as follows: bulk density 5.97 g / cm³. 3 It has an apparent porosity of 13.60% and a Rockwell hardness of 74.4 HRB.

[0067] Comparative Example 1

[0068] The raw material ratios and preparation steps used in this comparative example are basically the same as those in Example 1. The difference is that the raw material components do not contain additives, and the mass percentages of each raw material component are: diamond powder 10%, Al powder 16.76%, and Ni powder 73.24%, ultimately yielding Ni-Al based metal-bonded diamond tool material.

[0069] Performance testing:

[0070] The physical and mechanical properties of the tool material were measured, and the results showed a bulk density of 4.19 g / cm³. 3 It has an apparent porosity of 31.61% and a Rockwell hardness of 63.2 HRB.

[0071] Comparative Example 2

[0072] The components used in this comparative example are basically the same as those in Example 1. The difference is that a self-propagating high-temperature synthesis reaction was not used in this comparative example. Instead, a traditional sintering method was used, and the proportions of each component are as follows: diamond powder 10%, Al powder 16.39%, Ni powder 71.61%, and Cu / Sn 2.0%. Other experimental parameters and preparation steps are the same as in Example 1, and Ni-Al based metal-bonded diamond tool material is finally obtained.

[0073] Performance testing:

[0074] The physical and mechanical properties of the prepared tool material were measured, and the results showed that the bulk density was 4.56 g / cm³. 3 It has an apparent porosity of 27.90% and a Rockwell hardness of 67.24 HRB.

[0075] Comparative Example 3

[0076] The preparation steps used in this comparative example are basically the same as those in Example 1, except that the amount of additive exceeds 45%. The proportions of each group in this comparative example are: diamond powder 10%, Al powder 7.45%, Ni powder 32.55%, and additive Cu 50%. Other experimental parameters and preparation steps are the same as in Example 1, and Ni-Al based metal-bonded diamond tool material is finally obtained.

[0077] Performance testing:

[0078] The physical and mechanical properties of the prepared tool material were measured, and the results showed that the bulk density was 4.19 g / cm³. 3 It has an apparent porosity of 33.64% and a Rockwell hardness of 62.8 HRB.

[0079] As can be seen from the above examples and comparative examples, the Ni-Al based metal-bonded diamond tool material prepared by the self-propagating high-temperature synthesis method with the following mass ratios is 8%–11% diamond powder, 2.5%–45% Cu, Sn, or Cu / Sn additives, 8.37%–16.29% Al powder, and 36.63%–71.21% Ni powder has a bulk density of 4.90–5.97 g / cm³. 3 The Rockwell hardness ranges from 70 to 96.3 HRB. When the additive content is outside the range of 2.5% to 45%, the bulk density is below 4.90 g / cm³. 3 Its Rockwell hardness is less than 70 HRB.

[0080] The preferred embodiments of this disclosure have been described in detail above. 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.

[0081] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0082] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A method for preparing a Ni-Al based metal-bonded diamond tool material, characterized in that, The method includes the following steps: Step 1: Using Al powder, Ni powder and diamond powder as raw materials, and Cu powder or Sn powder or Cu-Sn alloy powder as additives, the initial billet is obtained by unidirectional pressing under a pressure of 90~110 MPa. Step 2: Place the initial billet in a cold isostatic press and press it into a billet body under a pressure of 140~160 MPa; Step 3: Place the green body in a self-propagating high-temperature synthesis device to carry out a self-propagating reaction, and the product is obtained; In step 1, by mass percentage, diamond powder is 8%~11%, additives are 2.5~45%, Al powder is 8.37~16.29%, Ni powder is 36.63~71.21%, and the total mass percentage of each component is 100%.

2. The method for preparing Ni-Al based metal-bonded diamond tool material as described in claim 1, characterized in that, In the Cu-Sn alloy powder, by mass percentage, Cu powder accounts for 80-85% and Sn powder accounts for 15-20%.

3. The method for preparing Ni-Al based metal-bonded diamond tool material as described in claim 1, characterized in that, In step 1, by mass percentage, diamond powder is 10%, Sn powder is 2.5%, Al powder is 16.29%, and Ni powder is 71.21%.

4. The method for preparing Ni-Al based metal-bonded diamond tool material as described in claim 1, characterized in that, In step 1, by mass percentage, diamond powder is 10%, Cu powder is 10%, Al powder is 14.90%, and Ni powder is 65.10%.

5. The method for preparing Ni-Al based metal-bonded diamond tool material as described in claim 1, characterized in that, The self-propagating reaction is carried out at a temperature of 1200~1426K for a time of 20~30 s.

6. The method for preparing Ni-Al based metal-bonded diamond tool material as described in claim 1, characterized in that, The method includes the following steps: Step 1: Using Al powder, Ni powder and diamond powder as raw materials, and Cu powder or Sn powder or Cu-Sn alloy powder as additives, the initial billet is obtained by unidirectional pressing under a pressure of 90MPa. Step 2: Place the initial billet in a cold isostatic press and press it into a billet body under a pressure of 150 MPa; Step 3: Place the green body in a self-propagating high-temperature synthesis device to carry out a self-propagating reaction, and the product is obtained; In step 1, the proportions by weight are as follows: diamond powder 10%, Al powder 16.29%, Ni powder 71.21%, and Sn powder 2.5%. The self-propagating reaction is carried out at a temperature of 1200~1426K for a time of 20~30 s.

7. A Ni-Al based metal-bonded diamond tool material, characterized in that, It is prepared by the method for preparing Ni-Al based metal-bonded diamond tool material as described in any one of claims 1 to 6; The Ni-Al based metal-bonded diamond tool material contains, by mass percentage, the following components: 8%~11% diamond powder, 2.5~45% additives, 8.37~16.29% Al powder and 36.63~71.21% Ni powder, with the total mass percentage of each component being 100%.

8. The Ni-Al based metal-bonded diamond tool material as described in claim 7, characterized in that, The bulk density of the Ni-Al based metal-bonded diamond tool material is 4.90~5.97 g / cm³. 3 The apparent porosity is 12.43%~36.15%, and the Rockwell hardness is 70~96.3 HRB.

9. The application of the Ni-Al based metal-bonded diamond tool material as described in claim 7 or claim 8 in the preparation of cutting tools or abrasives.