Preparation method of tantalum boride powder

Abstract

The invention provides a preparation method of a tantalum boride powder. The preparation method comprises preparing, mixing, solidifying, milling, briquetting, firing and milling. The preparation method is characterized by comprising the following steps: mixing tantalum pentoxide powder, boron carbide powder and B2O3 powder with phenolic resin; solidifying at the temperature of 40-100 DEG C and then milling; pressing the powders into block bodies; and then firing the block bodies for 6-8 hours at the temperature of 1350 DEG C-2000 DEG C under the atmosphere of argon or hydrogen so as to prepare the tantalum boride block bodies; and then smashing the tantalum boride block bodies after decarbonization so as to prepare the tantalum boride powder. The preparation method has simple process andlow cost, and the tantalum boride powder is high in purity and is good in sintering property.

Description

technical field

[0001] The invention relates to a method for preparing tantalum boride powder, which belongs to the technical field of ceramic powder preparation. Background technique

[0002] Tantalum boride powder is mainly prepared by carbothermal reduction of tantalum pentoxide powder and carbon black or graphite powder. The reaction equation is:

[0003] 2 Ta 2 o 5 +B 4 C+15C+2B 2 o 3 =4TaB 2 +16CO↑

[0004] The above reaction process belongs to the solid-solid reaction type, and the reaction process is controlled by the diffusion of substances. The disadvantage of this method is that the tantalum pentoxide powder is mixed unevenly with carbon black or graphite powder, and the activity of the carbon black or graphite powder is low, which makes the reduction of tantalum pentoxide incomplete and becomes an impurity in the product. In addition, the carbon black or graphite powder remaining in the tantalum boride powder has low activity, and a higher temperature (gr...

Examples

Embodiment 1

[0023] 1. Raw material preparation:

[0024] The first step: tantalum pentoxide powder with a particle size of 0.1 μm, boron carbide powder with a particle size of 3 μm and B 2 o 3 The powders were uniformly mixed in a ratio of 70:14:3 to obtain raw material powder 1.

[0025] The second step: the above-mentioned raw material powder 1 and phenolic resin are mixed uniformly in a mixer mill at a weight ratio of 5:0.5, solidified at a temperature of 80° C., and then pulverized in a powder mill to make an average particle size of Raw material powder 2 of 10 μm.

[0026] The third step: the above-mentioned raw material powder 2 and the phenolic resin are mixed uniformly in a mixer mill at a weight ratio of 5:1, solidified at a temperature of 50° C., and then pulverized in a powder mill to form an average particle size of 20μm raw material powder3.

[0027] The fourth step: the above-mentioned raw material powder 3 and phenolic resin are mixed uniformly in a mixer mill at a weig...

Embodiment 2

[0034] 1. Raw material preparation:

[0035] The first step: tantalum pentoxide powder with a particle size of 2 μm, boron carbide powder with a particle size of 7 μm and 7 μm B 2 o 3 The powders were uniformly mixed at a ratio of 75:17:4.5 to obtain raw material powder 1.

[0036] The second step: the above-mentioned raw material powder 1 and phenolic resin are mixed uniformly in a mixer with a weight ratio of 5:0.75, solidified at a temperature of 90 ° C, and then pulverized in a powder mill to make a particle size of 15 μm. Raw material powder 2.

[0037] The third step: mix the above-mentioned raw material powder 2 and phenolic resin in a mixing mill with a weight ratio of 5:1.5, solidify at a temperature of 75°C, and then pulverize in a powder mill to make a raw material with a particle size of 35 μm Powder3.

[0038] Step 4: Mix the above-mentioned raw material powder 3 and phenolic resin with a weight ratio of 5:2.5 in a mixer mill, solidify at a temperature of 60°C...

Embodiment 3

[0045] 1. Raw material preparation:

[0046] The first step: tantalum pentoxide powder with a particle size of 3 μm, boron carbide powder with a particle size of 10 μm and 10 μm B 2 o 3 The powders were uniformly mixed in a ratio of 80:20:6 to obtain raw material powder 1.

[0047] The second step: the above-mentioned raw material powder 1 and phenolic resin are mixed uniformly in a mixer mill at a weight ratio of 5:1, solidified at a temperature of 100 ° C, and then pulverized in a powder mill to form a particle size of 20 μm. Raw material powder 2.

[0048] The third step: mix the above-mentioned raw material powder 2 and phenolic resin in a mixing mill with a weight ratio of 5:2, solidify at a temperature of 100°C, and then pulverize in a powder mill to make a raw material with a particle size of 50 μm Powder3.

[0049] Step 4: Mix the above-mentioned raw material powder 3 and phenolic resin in a mixing mill at a weight ratio of 5:3, solidify at a temperature of 80°C, a...

technical field

[0001] The invention relates to a method for preparing tantalum boride powder, which belongs to the technical field of ceramic powder preparation. Background technique

[0002] Tantalum boride powder is mainly prepared by carbothermal reduction of tantalum pentoxide powder and carbon black or graphite powder. The reaction equation is:

[0003] 2 Ta 2 o 5 +B 4 C+15C+2B 2 o 3 =4TaB 2 +16CO↑

[0004] The above reaction process belongs to the solid-solid reaction type, and the reaction process is controlled by the diffusion of substances. The disadvantage of this method is that the tantalum pentoxide powder is mixed unevenly with carbon black or graphite powder, and the activity of the carbon black or graphite powder is low, which makes the reduction of tantalum pentoxide incomplete and becomes an impurity in the product. In addition, the carbon black or graphite powder remaining in the tantalum boride powder has low activity, and a higher temperature (gr...

Examples

Embodiment 1

[0023] 1. Raw material preparation:

[0024] The first step: tantalum pentoxide powder with a particle size of 0.1 μm, boron carbide powder with a particle size of 3 μm and B 2 o 3 The powders were uniformly mixed in a ratio of 70:14:3 to obtain raw material powder 1.

[0025] The second step: the above-mentioned raw material powder 1 and phenolic resin are mixed uniformly in a mixer mill at a weight ratio of 5:0.5, solidified at a temperature of 80° C., and then pulverized in a powder mill to make an average particle size of Raw material powder 2 of 10 μm.

[0026] The third step: the above-mentioned raw material powder 2 and the phenolic resin are mixed uniformly in a mixer mill at a weight ratio of 5:1, solidified at a temperature of 50° C., and then pulverized in a powder mill to form an average particle size of 20μm raw material powder3.

[0027] The fourth step: the above-mentioned raw material powder 3 and phenolic resin are mixed uniformly in a mixer mill at a weig...

Embodiment 2

[0034] 1. Raw material preparation:

[0035] The first step: tantalum pentoxide powder with a particle size of 2 μm, boron carbide powder with a particle size of 7 μm and 7 μm B 2 o 3 The powders were uniformly mixed at a ratio of 75:17:4.5 to obtain raw material powder 1.

[0036] The second step: the above-mentioned raw material powder 1 and phenolic resin are mixed uniformly in a mixer with a weight ratio of 5:0.75, solidified at a temperature of 90 ° C, and then pulverized in a powder mill to make a particle size of 15 μm. Raw material powder 2.

[0037] The third step: mix the above-mentioned raw material powder 2 and phenolic resin in a mixing mill with a weight ratio of 5:1.5, solidify at a temperature of 75°C, and then pulverize in a powder mill to make a raw material with a particle size of 35 μm Powder3.

[0038] Step 4: Mix the above-mentioned raw material powder 3 and phenolic resin with a weight ratio of 5:2.5 in a mixer mill, solidify at a temperature of 60°C...

Embodiment 3

[0045] 1. Raw material preparation:

[0046] The first step: tantalum pentoxide powder with a particle size of 3 μm, boron carbide powder with a particle size of 10 μm and 10 μm B 2 o 3 The powders were uniformly mixed in a ratio of 80:20:6 to obtain raw material powder 1.

[0047] The second step: the above-mentioned raw material powder 1 and phenolic resin are mixed uniformly in a mixer mill at a weight ratio of 5:1, solidified at a temperature of 100 ° C, and then pulverized in a powder mill to form a particle size of 20 μm. Raw material powder 2.

[0048] The third step: mix the above-mentioned raw material powder 2 and phenolic resin in a mixing mill with a weight ratio of 5:2, solidify at a temperature of 100°C, and then pulverize in a powder mill to make a raw material with a particle size of 50 μm Powder3.

[0049] Step 4: Mix the above-mentioned raw material powder 3 and phenolic resin in a mixing mill at a weight ratio of 5:3, solidify at a temperature of 80°C, a...