High-performance vacuum brazing diamond product and preparation process thereof

Abstract

The invention relates to a high-performance vacuum brazing diamond product and a preparation process thereof, the high-performance vacuum brazing diamond product comprises a steel substrate, an adhesive layer, a diamond body, a metal alloy coating and a mixed brazing filler metal layer, and the adhesive layer is one or more of a thermosetting adhesive and a thermoplastic adhesive; the diamond body in the prepared diamond product does not have obvious corrosion marks, so that the surface smoothness of the diamond is effectively protected, the surface corrosion of the high-temperature liquid brazing filler metal to the diamond body is prevented, and the basic special properties of low surface friction coefficient and small abrasion of the diamond body are kept; the friction resistance in the grinding process can be effectively reduced, the grinding efficiency is improved, and the service life of a product is prolonged. By adding the metal alloy coating on the surface of the diamond body, uniform mixing or regular and ordered arrangement with a brazing filler metal layer is facilitated, diamond particles are more uniformly distributed, agglomeration and accumulation are avoided, more diamond particles can effectively participate in the grinding process due to uniform particle distribution, the grinding efficiency is improved, and the service life of the diamond is prolonged. Meanwhile, the problem of stress concentration caused by agglomeration and accumulation is avoided, and the strength and durability of the product are improved.

Description

Technical Field

[0001] The invention relates to the technical field of diamond tool manufacturing, and in particular to a high-performance vacuum brazed diamond product and a preparation process thereof. Background Art

[0002] Diamond is commonly known as "diamond drill", which is the original form of diamond we often talk about. It is a mineral composed of carbon and is an allotrope of graphite. Diamond is the hardest substance naturally existing in nature. In modern industry, diamond is widely used in cutting, grinding and other fields due to its extremely high hardness and excellent physical and mechanical properties. Diamond tools, especially brazed diamond tools prepared by brazing process, are highly favored due to their high grinding efficiency and long service life.

[0003] However, although brazed diamond tools have shown superior processing efficiency in steel-concrete construction, roads, mining and geology, their durability and service life are still insufficient, which has become the main factor restricting their widespread application.

[0004] On the one hand, during the production process of brazed diamond tools, diamonds are very susceptible to corrosion by high-temperature liquid brazing filler metal, which not only destroys the SP3 hybrid structure on the surface of diamonds, but also significantly reduces their grinding performance. On the other hand, during the mixing process of diamonds and brazing filler metals, diamonds are prone to agglomeration and accumulation, or form gaps and pores on the interface with the matrix. Agglomeration and accumulation will cause some diamond bodies to be unable to play their due role, and will also affect the grinding performance of diamonds, resulting in reduced grinding efficiency, accelerated wear rate, and shortened product life. In view of this, a high-performance vacuum brazed diamond product and its preparation process were explored and studied. Summary of the invention

[0005] The present invention provides a high-performance vacuum brazed diamond product and a preparation process thereof to solve the technical problems existing in the background technology.

[0006] To solve the above problems, the technical solution of the present invention is:

[0007] A high-performance vacuum brazed diamond product comprises a steel substrate, an adhesive layer, a diamond body, a metal alloy layer and a mixed brazing material layer.

[0008] Preferably, the adhesive layer is one or more of a thermosetting adhesive and a thermoplastic adhesive; wherein the thermosetting adhesive is one or more of epoxy resin, phenolic resin, polyurethane resin, polyester resin, and melamine resin, and the thermoplastic adhesive is one or more of polypropylene and polyethylene.

[0009] Preferably, the metal alloy layer is a copper-tin alloy.

[0010] Preferably, the mixed solder layer comprises the following components in terms of mass percentage: 95% to 99% nickel-based alloy solder and 0.2% to 5% cerium oxide powder.

[0011] The present invention also discloses a preparation process of a high-performance vacuum brazed diamond product, comprising the following steps:

[0012] Step 1: Applying an adhesive layer on the ground working surface of the steel substrate;

[0013] Step 2: Under high vacuum conditions, vacuum-plating a metal alloy layer on the surface of the diamond body to obtain copper-tin alloy-plated diamond particles;

[0014] Step 3: Arrange the diamond particles in the above step 2 in an orderly arrangement on the steel substrate coated with the adhesive layer in step 1;

[0015] Step 4: Under high vacuum conditions, weigh the nickel-based alloy brazing material and the cerium oxide powder according to the mass percentage to mix to obtain a mixed brazing material layer, and fill the mixed brazing material layer between the copper-tin alloy diamond particles to the same height as the diamond;

[0016] Step 5: Spray the adhesive layer with alcohol to obtain a wet product, and place the wet product in an oven for baking to obtain a baked product;

[0017] Step 6: Place the product baked in step 5 in a brazing furnace for brazing to obtain a brazed diamond product.

[0018] In the above technical solution, in step 2, the mass of the copper-tin alloy coating is 5% to 20%, and the coating method is vacuum resistance heating evaporation type vacuum coating.

[0019] In the above technical solution, in step 5, the arrangement spacing of the plurality of diamond particles is D to 5D, where D is the particle size of the copper-tin alloy-plated diamond particles.

[0020] In the above technical solution, in step six, the baking temperature is 60-120° C., and the baking time is 90-120 min.

[0021] The above technical solution of the present invention has the following beneficial technical effects:

[0022] 1. The diamond product prepared by the present invention has good corrosion resistance, no obvious corrosion marks, effectively protects the diamond surface, prevents the high-temperature liquid brazing material from corroding it, and has a low friction coefficient and small wear, which can effectively reduce the friction resistance in the grinding process, improve the grinding efficiency, and extend the service life of the product. The diamond particles are more evenly distributed to avoid agglomeration and accumulation. The uniform particle distribution can ensure that more diamond particles participate in the grinding process, improve the grinding efficiency, and avoid the stress concentration problem caused by agglomeration and accumulation, thereby improving the strength and durability of the product.

[0023] 2. The present invention increases the strength, toughness and wear resistance of the brazed alloy by adding cerium oxide powder, thereby improving the grinding performance of the brazed diamond product, and improves the corrosion ability of the copper-tin alloy-plated diamond by plating the diamond with a copper-tin alloy, thereby preventing the diamond from corroding during the brazing process. A layer of nano-scale coating is deposited on the surface of the diamond particles, and the nano-scale coating is used to effectively prevent the mutual attraction between the diamond particles, reduce the occurrence of agglomeration and accumulation, improve the bonding force between the diamond particles and the matrix, and prevent the diamond particles from forming gaps and pores at the interface of the diamond particles with the matrix. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0025] Example 1

[0026] A high-performance vacuum brazed diamond product comprises a steel substrate, an adhesive layer, a diamond body, a metal alloy layer, a nano-particle coating and a mixed brazing material layer.

[0027] The adhesive layer is a thermosetting adhesive, which is obtained by mixing epoxy resin and phenolic resin in a mass ratio of 2:1, and the metal alloy layer is a copper-tin plated alloy.

[0028] The mixed solder layer comprises the following components in terms of mass percentage: 95% nickel-based alloy solder and 5% cerium oxide powder.

[0029] A preparation process for a high-performance vacuum brazed diamond product comprises the following steps:

[0030] Step 1: Applying an adhesive layer on the ground working surface of the steel substrate;

[0031] Step 2: Under high vacuum conditions, vacuum-plating a metal alloy layer on the surface of the diamond body to obtain copper-tin alloy-plated diamond particles, the coating mass of the copper-tin alloy is 5%, and the plating method is vacuum resistance heating evaporation vacuum plating;

[0032] Step 3: Arrange the diamond particles in the above step 2 on the steel substrate coated with the adhesive layer in step 1 in a certain arrangement mode, wherein the certain arrangement mode is an orderly arrangement, and the arrangement spacing of a plurality of diamond particles is 1.2D, where D is the particle size of the copper-tin alloy-plated diamond particles;

[0033] Step 4: Under high vacuum conditions, weigh the nickel-based alloy brazing material and the cerium oxide powder according to the mass percentage to mix to obtain a mixed brazing material layer, and fill the mixed brazing material layer between the copper-tin alloy diamond particles to the same height as the diamond;

[0034] Step 5: Spray the adhesive layer with alcohol to obtain a wet product, place the wet product in an oven for baking at a temperature of 60° C. for 90 minutes, and obtain a baked product;

[0035] Step 6: Place the product baked in step 5 in a brazing furnace for brazing to obtain a brazed diamond product.

[0036] Example 2

[0037] A high-performance vacuum brazed diamond product comprises a steel substrate, an adhesive layer, a diamond body, a metal alloy layer, a nano-particle coating and a mixed brazing material layer.

[0038] The adhesive layer is a thermoplastic adhesive, the thermosetting adhesive is polyvinyl acetate, and the metal alloy layer is a copper-tin plated alloy.

[0039] The mixed solder layer comprises the following components in terms of mass percentage: 96% nickel-based alloy solder and 4% cerium oxide powder.

[0040] A preparation process for a high-performance vacuum brazed diamond product comprises the following steps:

[0041] Step 1: Applying an adhesive layer on the ground working surface of the steel substrate;

[0042] Step 2: Under high vacuum conditions, vacuum-plating a metal alloy layer on the surface of the diamond body to obtain copper-tin alloy-plated diamond particles, the coating mass of the copper-tin alloy is 8%, and the plating method is vacuum resistance heating evaporation vacuum plating;

[0043] Step 3: Arrange the diamond particles in the above step 2 on the steel substrate coated with the adhesive layer in a certain arrangement mode, wherein the certain arrangement mode is an orderly arrangement, and the arrangement spacing of a plurality of diamond particles is 2.5D, where D is the particle size of the copper-tin alloy-plated diamond particles;

[0044] Step 4: Under high vacuum conditions, weigh the nickel-based alloy brazing material and the cerium oxide powder according to the mass percentage to mix to obtain a mixed brazing material layer, and fill the mixed brazing material layer between the copper-tin alloy diamond particles to the same height as the diamond;

[0045] Step 5: Spray the adhesive layer with alcohol to obtain a wet product, place the wet product in an oven for baking at a temperature of 75° C. for 100 min to obtain a baked product;

[0046] Step 6: Place the product baked in step 5 in a brazing furnace for brazing to obtain a brazed diamond product.

[0047] Example 3

[0048] A high-performance vacuum brazed diamond product comprises a steel substrate, an adhesive layer, a diamond body, a metal alloy layer, a nano-particle coating and a mixed brazing material layer.

[0049] The adhesive layer is a thermosetting adhesive, which is obtained by mixing polyurethane resin and polyester resin in a mass ratio of 1:1, and the metal alloy layer is a copper-tin plated alloy.

[0050] The mixed solder layer comprises the following components in terms of mass percentage: 97% nickel-based alloy solder and 3% cerium oxide powder.

[0051] A preparation process for a high-performance vacuum brazed diamond product comprises the following steps:

[0052] Step 1: Applying an adhesive layer on the ground working surface of the steel substrate;

[0053] Step 2: Under high vacuum conditions, vacuum-plating a metal alloy layer on the surface of the diamond body to obtain copper-tin alloy-plated diamond particles, the coating mass of the copper-tin alloy is 12%, and the plating method is vacuum resistance heating evaporation vacuum plating;

[0054] Step 3: Arrange the diamond particles in the above step 2 on the steel substrate coated with the adhesive layer in a certain arrangement mode, wherein the certain arrangement mode is an orderly arrangement, and the arrangement spacing of the diamond particles is 3.2D, where D is the particle size of the copper-tin alloy-plated diamond particles;

[0055] Step 4: Under high vacuum conditions, weigh the nickel-based alloy brazing material and the cerium oxide powder according to the mass percentage to mix to obtain a mixed brazing material layer, and fill the mixed brazing material layer between the copper-tin alloy diamond particles to the same height as the diamond;

[0056] Step 5: Spray the adhesive layer with alcohol to obtain a wet product, place the wet product in an oven for baking at a temperature of 85° C. for 100 min to obtain a baked product;

[0057] Step 6: Place the product baked in step 5 in a brazing furnace for brazing to obtain a brazed diamond product.

[0058] Example 4

[0059] A high-performance vacuum brazed diamond product comprises a steel substrate, an adhesive layer, a diamond body, a metal alloy layer and a mixed brazing material layer.

[0060] The adhesive layer is a thermosetting adhesive, the thermosetting adhesive is an epoxy resin, and the metal alloy layer is a copper-tin plated alloy.

[0061] The mixed solder layer comprises the following components in terms of mass percentage: 98% nickel-based alloy solder and 2% cerium oxide powder.

[0062] A preparation process for a high-performance vacuum brazed diamond product comprises the following steps:

[0063] Step 1: Applying an adhesive layer on the ground working surface of the steel substrate;

[0064] Step 2: Under high vacuum conditions, vacuum-plating a metal alloy layer on the surface of the diamond body to obtain copper-tin alloy-plated diamond particles, the coating mass of the copper-tin alloy is 16%, and the plating method is vacuum resistance heating evaporation vacuum plating;

[0065] Step 3: Arrange the diamond particles in the above step 2 on the steel substrate coated with the adhesive layer in a certain arrangement mode, wherein the certain arrangement mode is an orderly arrangement, and the arrangement spacing of a plurality of diamond particles is 4D, where D is the particle size of the copper-tin alloy-plated diamond particles;

[0066] Step 4: Under high vacuum conditions, weigh the nickel-based alloy brazing material and the cerium oxide powder according to the mass percentage to mix to obtain a mixed brazing material layer, and fill the mixed brazing material layer between the copper-tin alloy diamond particles to the same height as the diamond;

[0067] Step 5: Spray the adhesive layer with alcohol to obtain a wet product, place the wet product in an oven for baking at a temperature of 115° C. for 105 min to obtain a baked product;

[0068] Step 6: Place the product baked in step 5 in a brazing furnace for brazing to obtain a brazed diamond product.

[0069] Example 5

[0070] A high-performance vacuum brazed diamond product comprises a steel substrate, an adhesive layer, a diamond body, a metal alloy layer and a mixed brazing material layer.

[0071] The adhesive layer is a thermosetting adhesive, the thermosetting adhesive is a phenolic resin, and the metal alloy layer is a copper-tin plated alloy.

[0072] The mixed solder layer comprises the following components in terms of mass percentage: 99% nickel-based alloy solder and 1% cerium oxide powder.

[0073] A preparation process for a high-performance vacuum brazed diamond product comprises the following steps:

[0074] Step 1: Applying an adhesive layer on the ground working surface of the steel substrate;

[0075] Step 2: Under high vacuum conditions, vacuum-plating a metal alloy layer on the surface of the diamond body to obtain copper-tin alloy-plated diamond particles, the coating mass of the copper-tin alloy is 18%, and the plating method is vacuum resistance heating evaporation vacuum plating;

[0076] Step 3: Arrange the diamond particles in the above step 2 on the steel substrate coated with the adhesive layer in a certain arrangement mode, wherein the certain arrangement mode is an orderly arrangement, and the arrangement spacing of a plurality of diamond particles is 5D, where D is the particle size of the copper-tin alloy-plated diamond particles;

[0077] Step 4: Under high vacuum conditions, weigh the nickel-based alloy brazing material and the cerium oxide powder according to the mass percentage to mix to obtain a mixed brazing material layer, and fill the mixed brazing material layer between the copper-tin alloy diamond particles to the same height as the diamond;

[0078] Step 5: Spray the adhesive layer with alcohol to obtain a wet product, place the wet product in an oven for baking at a temperature of 120° C. for 120 min to obtain a baked product;

[0079] Step 6: Place the product baked in step 5 in a brazing furnace for brazing to obtain a brazed diamond product.

[0080] Comparative Example 1

[0081] This comparative example is basically the same as Example 3, except that in this comparative example, the mixed solder layer is a nickel-based alloy solder, and no cerium oxide powder is added.

[0082] Comparative Example 2

[0083] This comparative example is basically the same as Example 3, except that in this comparative example, no metal alloy layer is vacuum plated on the surface of the diamond body.

[0084] Comparative Example 3

[0085] This comparative example is basically the same as Example 3, except that in this comparative example, the mixed brazing material layer is a nickel-based alloy brazing material, no cerium oxide powder is added, and no metal alloy layer is vacuum plated on the surface of the diamond body.

[0086] Comparative Example 4

[0087] This comparative example is basically the same as Example 3, except that in this comparative example, the mixed solder layer is a nickel-based alloy solder, and no cerium oxide powder is added.

[0088] Comparative Example 5

[0089] This comparative example is basically the same as Example 3, except that in this comparative example, no metal alloy layer is vacuum plated on the surface of the diamond body.

[0090] Comparative Example 6

[0091] This comparative example is basically the same as Example 3, except that in this comparative example, the mixed brazing material layer is a nickel-based alloy brazing material, no cerium oxide powder is added, and no metal alloy layer is vacuum plated on the surface of the diamond body.

[0092] Performance Testing

[0093] The brazed diamond products prepared in the above Examples 1 to 5 and Comparative Examples 1 to 7 are respectively marked as Example 1, Example 2, Example 3, Example 4, Example 5, Comparative Example 1, Comparative Example 2, Comparative Example 3, Comparative Example 4, Comparative Example 5, Comparative Example 6, and Comparative Example 7. The performance of Examples 1 to 5 and Comparative Examples 1 to 7 was tested, and the specific testing methods and test items are as follows:

[0094] 1. Corrosion degree test: Use scanning electron microscope (SEM) or transmission electron microscope (TEM) to observe the surface morphology of diamond, and combine with X-ray photoelectron spectroscopy (XPS) to evaluate the degree of damage to the SP3 hybrid structure on the surface of diamond, and determine whether there are obvious signs of corrosion on the diamond product, such as surface pits, cracks, etc.;

[0095] 2. Friction and wear test: The tribological properties of the samples were tested by ball-on-disc friction and wear test using a CFT-I material surface performance comprehensive tester (Lanzhou Zhongke Kaihua Technology Development Co., Ltd.) at the maximum load capacity of the tester (10kN) when the test time reached 150s;

[0096] 3. Scanning electron microscope (SEM) analysis: Cut the brazed diamond products to expose the diamond particles and the matrix. Use a scanning electron microscope to observe the distribution of diamond particles on the matrix. By observing the pictures, determine whether the diamonds are agglomerated and accumulated.

[0097] The above data are recorded in the table.

[0098]

[0099] It can be seen from the data in the table that the diamond product prepared by the present invention has good corrosion resistance, no obvious corrosion marks, effectively protects the diamond surface, and prevents the high-temperature liquid brazing material from corroding it; and has a low friction coefficient and small wear, which can effectively reduce the friction resistance in the grinding process, improve the grinding efficiency, and extend the service life of the product; and the diamond particles are more evenly distributed to avoid agglomeration and accumulation. The uniform particle distribution can ensure that more diamond particles participate in the grinding process, improve the grinding efficiency, and avoid the stress concentration problem caused by agglomeration and accumulation, thereby improving the strength and durability of the product.

[0100] The invention increases the strength, toughness and wear resistance of the brazing alloy by adding cerium oxide powder, thereby improving the grinding performance of the brazed diamond product, and improves the corrosion ability of the copper-tin alloy-plated diamond by plating the diamond with the copper-tin alloy, thereby preventing the diamond from corroding during the brazing process, effectively preventing the mutual attraction between diamond particles, reducing the occurrence of agglomeration and accumulation, improving the bonding force between the diamond particles and the matrix, and preventing the diamond particles from forming gaps and pores on the interface of the diamond particles with the matrix.

[0101] The above examples illustrate that the high-performance vacuum brazed diamond product and its preparation process provided in the present invention have better market application prospects.

[0102] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high performance vacuum brazed diamond product, characterized in that: The high-performance vacuum brazed diamond product comprises a steel matrix, an adhesive layer, a diamond body, a metal alloy layer and a mixed brazing material layer.

2. A high performance vacuum brazed diamond product according to claim 1, characterized in that: The adhesive layer is one or more of a thermosetting adhesive and a thermoplastic adhesive; Among them, the thermosetting adhesive is one or more of epoxy resin, phenolic resin, polyurethane resin, polyester resin, and melamine resin, and the thermoplastic adhesive is one or more of polypropylene and polyethylene.

3. A high performance vacuum brazed diamond product according to claim 1, characterized in that: The metal alloy layer is a copper-tin plated alloy.

4. A high performance vacuum brazed diamond product according to claim 1, characterized in that: The mixed solder layer comprises the following components in terms of mass percentage: 95% to 99% of nickel-based alloy solder and 0.2% to 5% of cerium oxide powder.

5. A process for preparing a high performance vacuum brazed diamond product according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Applying an adhesive layer on the ground working surface of the steel substrate; Step 2: Under high vacuum conditions, vacuum-plating a metal alloy layer on the surface of the diamond body to obtain copper-tin alloy-plated diamond particles; Step 3: Arrange the diamond particles in the above step 2 in an orderly arrangement on the steel substrate coated with the adhesive layer in step 1; Step 4: Under high vacuum conditions, weigh the nickel-based alloy brazing material and the cerium oxide powder according to the mass percentage to mix to obtain a mixed brazing material layer, and fill the mixed brazing material layer between the copper-tin alloy diamond particles to the same height as the diamond; Step 5: Spray the adhesive layer with alcohol to obtain a wet product, and place the wet product in an oven for baking to obtain a baked product; Step 6: Place the product baked in step 5 in a brazing furnace for brazing to obtain a brazed diamond product.

6. A process for preparing a high performance vacuum brazed diamond product according to claim 5, characterized in that: In the step 2, the mass of the copper-tin alloy coating is 5% to 20%, and the coating method is vacuum resistance heating evaporation type vacuum coating.

7. A process for preparing a high performance vacuum brazed diamond product according to claim 5, characterized in that: In the step 5, the arrangement spacing of the plurality of diamond particles is D to 5D, where D is the particle size of the copper-tin alloy-plated diamond particles.

8. The process for preparing a high performance vacuum brazed diamond product according to claim 5, characterized in that: In the step six, the baking temperature is 60-120° C., and the baking time is 90-120 min.

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