A single-phase tantalum carbonitride solid solution powder

Abstract

This invention provides a single-phase tantalum carbonitride solid solution powder, prepared by the following method: 35-40 parts by weight of tantalum pentoxide and 10-12 parts by weight of carbon black are uniformly mixed and loaded into a graphite boat and compacted. The graphite boat is then pushed into a high-temperature horizontal carbon tube furnace for carbonization at 1800°C, while nitrogen gas is simultaneously introduced. The boat is pushed for 30 minutes per boat, the high-temperature carbonization time is 1-1.5 hours, and the cooling time is 2-3 hours, yielding a preliminarily carbonized tantalum carbonitride solid solution. This solution is then crushed in a ball mill to remove loose fibers. The loose portion is placed into a graphite container and subjected to secondary carbonization in a vacuum furnace at a temperature of 1650℃ for 12 hours to obtain tungsten carbide vanadium solid solution. This solid solution is then added to a ball mill and milled for 1-2 hours at a ball-to-material ratio of 1-3:1. The solid solution is then sieved through a 250-325 mesh screen to obtain single-phase tantalum carbonitride solid solution powder with a particle size of 1-1.5 micrometers. This powder can be widely used as an additive in cemented carbide to improve its wear resistance, strength, and toughness. It can also be applied to cermets to enhance their strength.

Description

Technical Field

[0001] This invention belongs to the field of new material preparation, and in particular relates to a single-phase tantalum carbonitride solid solution powder. Background Technology

[0002] When cemented carbide cutting tools cut steel, the increasing hardness of the workpiece and the increasing cutting speed place higher demands on the high-temperature performance and fracture toughness of the alloy.

[0003] Therefore, it is of great significance to develop new tantalum carbonitride solid solution powder to enable cemented carbide to have higher high-temperature resistance and toughness at high temperatures. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention provides a single-phase tantalum carbonitride solid solution powder to solve the problems existing in the background technology. This tantalum carbonitride solid solution powder is single-phase, has a simple preparation method, low investment cost, and good market prospects.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is as follows:

[0006] A single-phase tantalum carbonitride solid solution powder, the preparation method of which is as follows:

[0007] A single-phase tantalum carbonitride solid solution powder, the preparation method of which is as follows:

[0008] a. By weight: Mix 35-40 parts of tantalum pentoxide and 10-12 parts of carbon black evenly, then pack the evenly mixed material into a graphite boat and press it tightly.

[0009] b. Push the graphite boat containing the material into the carbon tube furnace for carbonization at a carbonization temperature of 1800℃, while simultaneously introducing nitrogen gas. Push the boat for 30 minutes per boat, and the high-temperature carbonization time is 1-1.5 hours. Then, cool for 2-3 hours to obtain a preliminary carbonized tantalum carbonitride solid solution.

[0010] c. The obtained pre-carbonized tantalum carbonitride solid solution is crushed in a ball mill, and then the loose part is loaded into a graphite container and placed in a vacuum furnace for secondary carbonization at a carbonization temperature of 1650℃ and a holding time of 12h to obtain blocky tungsten carbide vanadium solid solution.

[0011] d. Add the blocky tungsten carbide vanadium solid solution produced after secondary carbonization to a ball mill and ball mill for 1-2 hours at a ball-to-material ratio of 1-3:1. Screen the ball-milled product with a 250-325 mesh sieve to separate the undispersed powder agglomerates and obtain FSSS single-phase tantalum carbonitride solid solution powder with a particle size of 1-1.5 micrometers.

[0012] In one embodiment, the mixing in step a is carried out using a double cone mixer, with a mixing time of 5-6 hours and a mixing quantity of 100-200 kg per batch.

[0013] In one embodiment, the carbon tube furnace mentioned in step b is a high-temperature horizontal carbon tube furnace.

[0014] The basic principle of this invention is:

[0015] The chemical equations for the reactions it contains are as follows:

[0016] Ta₂O₅ + C + N → TaCN + CO↑

[0017] The above chemical reaction produces a large amount of CO gas, which acts as a self-protective gas.

[0018] Compared with the prior art, the single-phase tantalum carbonitride solid solution powder provided by the present invention has the following advantages:

[0019] 1. The single-phase tantalum carbonitride solid solution powder provided by this invention is a single phase and can be widely used as an additive for cemented carbide to significantly improve the wear resistance, strength and toughness of cemented carbide; it can also be used in cermets to significantly improve the strength of cermets.

[0020] 2. The present invention provides a method for preparing single-phase tantalum carbonitride solid solution powder, which is simple to operate, easy to implement, and has high solid solubility. Detailed Implementation

[0021] To better understand the present invention, the present invention will be further described in detail below with reference to the embodiments. However, the scope of protection of the present invention is not limited to the scope shown in the embodiments.

[0022] Example 1:

[0023] 97.97 kg of tantalum pentoxide and 27.034 kg of carbon black were mixed evenly in a double-cone mixer for 5 hours. The mixture was then loaded into a graphite boat and compacted. The loaded boat was then pushed into a high-temperature horizontal carbon tube furnace for carbonization at 1800℃, with nitrogen gas introduced simultaneously. The boat was pushed every 30 minutes, and the high-temperature carbonization time was 1 hour, followed by a 2-hour cooling period. This yielded a pre-carbonized tantalum carbonitride solid solution. The pre-carbonized tantalum carbonitride solid solution was then subjected to [further processing / processing]. The material is crushed in a mill, and then the loose part is loaded into a graphite container and placed into a vacuum furnace for secondary carbonization at a temperature of 1650℃ for 12 hours to obtain blocky tungsten carbide vanadium solid solution. The blocky tungsten carbide vanadium solid solution produced after secondary carbonization is added to a ball mill and ball-milled for 1 hour at a ball-to-material ratio of 2:1. The ball-milled product is then screened through a 280-mesh sieve to separate the undispersed powder agglomerates, resulting in single-phase tantalum carbonitride solid solution powder with a particle size of 1.25 micrometers.

[0024] Its main technical specifications are as follows:

[0025] Element mass percentage Ta: 93.02％ N: 2.47％ O: 0.18％ TotalC: 4.30％ FreeC: 0.07％ Fe: 0.017％

[0026] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0027] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A single-phase tantalum carbonitride solid solution powder, characterized in that, Its preparation method is as follows: a. By weight: Mix 35-40 parts of tantalum pentoxide and 10-12 parts of carbon black evenly, then pack the evenly mixed material into a graphite boat and press it tightly. b. Push the graphite boat containing the material into the carbon tube furnace for carbonization at a carbonization temperature of 1800℃, while simultaneously introducing nitrogen gas. Push the boat for 30 minutes per boat, and the high-temperature carbonization time is 1-1.5 hours. Then, cool for 2-3 hours to obtain a preliminary carbonized tantalum carbonitride solid solution. c. The obtained pre-carbonized tantalum carbonitride solid solution is crushed in a ball mill, and then the loose part is loaded into a graphite container and placed in a vacuum furnace for secondary carbonization at a carbonization temperature of 1650℃ and a holding time of 12h to obtain blocky tungsten carbide vanadium solid solution. d. The blocky tungsten carbide vanadium solid solution produced after secondary carbonization is added to a ball mill and ball-milled for 1-2 hours at a ball-to-material ratio of 1-3:

1. The ball-milled product is then screened using a 250-325 mesh sieve to separate the undispersed powder agglomerates, resulting in single-phase tantalum carbonitride solid solution powder with a particle size of 1-1.5 micrometers and a Ta content of 93.02%.

2. The single-phase tantalum carbonitride solid solution powder according to claim 1, characterized in that, The mixing in step a is carried out using a double cone mixer, with a mixing time of 5-6 hours and a mixing quantity of 100-200 kg per batch.

3. The single-phase tantalum carbonitride solid solution powder according to claim 1, characterized in that, The carbon tube furnace mentioned in step b is a high-temperature horizontal carbon tube furnace.