A single-phase tungsten vanadium carbide solid solution powder

Abstract

The application provides a single-phase tungsten vanadium carbide solid solution powder, and a preparation method thereof is as follows: 30-40 parts of tungsten powder, 15-20 parts of vanadium pentoxide and 10-12 parts of carbon black are uniformly mixed; then the materials are loaded into a graphite boat and compacted; the graphite boat is pushed into a carbon tube furnace for carbonization, the carbonization temperature is 1600-1650 DEG C, the boat pushing time is 40 minutes / boat, the high-temperature carbonization time is 1-1.5 hours, and the cooling time is 2-3 hours; the obtained blocky tungsten vanadium carbide solid solution is broken in a ball mill, then the loose part is loaded into a graphite container and enters a vacuum furnace for secondary carbonization, the carbonization temperature is 1550 DEG C, the holding time is 12 hours; the product after the secondary carbonization is added into the ball mill for ball milling for 1-2 hours, the ball-to-material ratio is 1-3:1; the product after the ball milling is screened by using a 40-120 mesh screen to obtain the single-phase tungsten vanadium carbide solid solution powder with a FSSS particle size of 3-4 microns, which can be applied to the production and manufacturing of cutting tools in hard alloys, and can significantly improve the wear resistance, strength and toughness of the hard alloy.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of new material preparation, in particular to a single-phase tungsten vanadium carbide solid solution powder. BACKGROUND

[0002] When the hard alloy cutting tool cuts steel, due to the increasing hardness of the processed material and the increasing cutting speed, the high-temperature performance and the fracture toughness of the alloy at high temperature are also required to be higher;

[0003] Therefore, it is of great significance to develop a new tungsten vanadium carbide solid solution powder to make the hard alloy have higher high-temperature performance and toughness at high temperature. SUMMARY

[0004] In view of the above problems existing in the prior art, the single-phase tungsten vanadium carbide solid solution powder is provided to solve the problems existing in the background art. The tungsten vanadium carbide solid solution powder is single-phase, the preparation method is simple, and the tungsten vanadium carbide solid solution powder can not only improve the high-temperature performance of the hard alloy, but also improve the fracture toughness of the hard alloy.

[0005] To achieve the above-mentioned purposes, the technical scheme adopted by the present application is as follows:

[0006] A single-phase tungsten vanadium carbide solid solution powder, the preparation method thereof is:

[0007] a, uniformly mix 30-40 parts of tungsten powder, 15-20 parts of vanadium pentoxide and 10-12 parts of carbon black by weight; then put the uniformly mixed material into a graphite boat and compact it;

[0008] b, push the graphite boat with the material into a carbon tube furnace for carbonization, the carbonization temperature is 1600-1650 DEG C, the pushing boat time is 40 minutes / boat, the high-temperature carbonization time is 1-1.5 hours, and then the cooling time is 2-3 hours, to obtain a preliminary carbonized tungsten vanadium carbide solid solution;

[0009] c, crush the obtained preliminary carbonized tungsten vanadium carbide solid solution in a ball mill, then put the loose part into a graphite container into a vacuum furnace for secondary carbonization, the carbonization temperature is 1550 DEG C; the holding time is 12h, to obtain a blocky tungsten vanadium carbide solid solution;

[0010] d, add the blocky tungsten vanadium carbide solid solution produced after the secondary carbonization into a ball mill for 1-2h, the ball-to-material ratio is 1-3:1; screen the product after ball milling with a 40-120 mesh screen to separate out the powder agglomerates that are not dispersed, to obtain a single-phase tungsten vanadium carbide solid solution powder with a particle size of 3-4 microns.

[0011] In one of the embodiments, the mixing in step a is performed by a double-cone mixer, the mixing time is 5-6 hours, and the mixing amount is 100-200 kg per batch.

[0012] In one of the embodiments, the carbon tube furnace in step b is a high-temperature horizontal carbon tube furnace.

[0013] The basic principle of the present application is:

[0014] The reaction chemical equation is:

[0015] W+C=WC

[0016] V2O5+7C=2VC+5CO

[0017] WC+VC=(WV)C

[0018] A large amount of CO gas is generated in the above chemical reaction, which serves as a self-protective gas.

[0019] Compared with the prior art, the single-phase tungsten vanadium carbide solid solution powder provided by the present application has the following advantages:

[0020] 1. The single-phase tungsten vanadium carbide solid solution powder provided by the present application is single-phase, and can be applied to the production and manufacturing of cutting tools in hard alloys, thereby significantly improving the wear resistance, strength and toughness of the hard alloy.

[0021] 2. The preparation method of the single-phase tungsten vanadium carbide solid solution powder provided by the present application is simple to operate, easy to implement, and has high solid solubility. DETAILED DESCRIPTION

[0022] In order to better understand the present application, the present application will be further described in detail below in combination with examples, but the scope of protection claimed by the present application is not limited to the scope indicated by the examples.

[0023] Example 1:

[0024] The purchased tungsten powder 80.53 kg, vanadium pentoxide 39.83 kg and 23.64 kg carbon black are mixed for 6 hours by a double-cone mixer, then loaded into a graphite boat and compacted, and then the graphite boat loaded with the material is put into a high-temperature horizontal carbon tube furnace for carbonization, the boat pushing time is 40 minutes per boat, the carbonization temperature is 1620℃, the high-temperature carbonization time is 1.5 hours, and after cooling for 3 hours, a preliminary carbonized tungsten vanadium solid solution is obtained. Then the preliminary carbonized tungsten vanadium solid solution is crushed in a ball mill, and then the loose state of the product produced after ball milling is loaded into a graphite boat and put into a vacuum furnace for secondary carbonization, the carbonization temperature is 1550℃, and the holding time is 12 hours, to obtain a blocky tungsten vanadium solid solution. After cooling to room temperature, the blocky tungsten vanadium solid solution produced after the completion of secondary carbonization is added to a ball mill and ball milled for 2 hours, and the ball-to-material ratio is 3:1. The product after ball milling is screened by a 100-mesh screen to separate out the powder agglomerates that have not been dispersed, and a single-phase tungsten vanadium solid solution powder with a FSSS particle size of 3.4 microns is obtained.

[0025] The main technical indexes are as follows:

[0026] Ingredients Mass Percent W: 70.90％ V: 19.50％ O: 0.30％ N: 0.03％ Total C: 9.20％ Free C: 0.05％ Fe: 0.052％

[0027] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not contradict, they should be considered within the scope of the present disclosure.

[0028] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the present patent. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims

1. A single-phase tungsten carbide vanadium solid solution powder, characterized in that, Its preparation method is as follows: a. By weight: Mix 30-40 parts tungsten powder, 15-20 parts vanadium pentoxide, and 10-12 parts 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. The carbonization temperature is 1600℃-1650℃, the boat pushing time is 40 minutes / boat, the high-temperature carbonization time is 1-1.5 hours, and then the cooling time is 2-3 hours to obtain the preliminary carbonized tungsten carbide vanadium solid solution. c. The obtained pre-carbonized tungsten carbide vanadium solid solution is crushed in a ball mill, and then the loose part is loaded into a graphite container and placed into a vacuum furnace for secondary carbonization. The carbonization temperature is 1550℃ and the holding time is 12h to obtain blocky tungsten carbide vanadium solid solution. 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 40-120 mesh sieve to separate the undispersed powder agglomerates and obtain single-phase tungsten carbide vanadium solid solution powder with a particle size of 3-4 micrometers.

2. The single-phase tungsten carbide vanadium solid solution powder according to claim 1, characterized in that, The mixing in step a uses a double cone mixer, the mixing time is 5h-6h, and the mixing amount is 100-200kg per batch.

3. The single-phase tungsten carbide vanadium 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.