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Nanoscale Al-TiB2 intermediate alloy and preparation method thereof

An al-tib2, master alloy technology, applied in the field of master alloy, can solve the problems of high preparation cost, pollution, low preparation efficiency, etc., and achieve the effect of small particle size and high particle content

Inactive Publication Date: 2019-07-02
大连科天新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Al-TiB Prepared by Mixed Salt Reaction Method 2 In the master alloy structure, TiAl 3 The phase exists, and the length is generally about 100 μm. This phase will act as a brittle phase in the composite material, which is detrimental to the performance of the composite material.
At the same time, serious pollution problems will occur during the preparation process.
In order to prepare Al-TiB with high particle content and environment-friendly 2 Refining agent, various methods have been tried at home and abroad, such as oxide method, high-temperature self-propagating synthesis method, etc., mainly have the disadvantages of low preparation efficiency and high preparation cost.

Method used

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  • Nanoscale Al-TiB2 intermediate alloy and preparation method thereof
  • Nanoscale Al-TiB2 intermediate alloy and preparation method thereof
  • Nanoscale Al-TiB2 intermediate alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of Al-10TiB by Melt Self-propagating Direct Synthesis 2 The intermediate process is as follows:

[0021] 1) Raw material preparation, the master alloy consists of B powder, Ti powder, aluminum powder, C 2 Cl 6 Preparation, wherein the purity of aluminum ingot is 99.9%, and the purity of B powder is 96%.

[0022] 2) Prepare 1Kg of master alloy, weigh B powder, aluminum powder, titanium powder, and aluminum ingot as required, and the aluminum burning loss rate is 3%. Al powder is required: B powder: Ti powder = 3.2:2.2:1 (mol), and the rest is Al.

[0023] 3) Heat B powder and Ti powder at 200°C for two hours to remove moisture, take out the powder every 30 minutes and stir to prevent agglomeration.

[0024] 4) Mix the heated powder with titanium powder and aluminum powder evenly, put the evenly mixed powder in the mold, and press it into 15×Φ65mm 3 Cylindrical powder block, the nominal density of the powder block is 4.7g / cm 3 .

[0025] 5) Paint a laye...

Embodiment 2

[0028] Preparation of Al-10TiB by Melt Self-propagating Direct Synthesis 2 The intermediate process is as follows:

[0029] 1) Raw material preparation, the master alloy consists of B powder, Ti powder, aluminum powder, C 2 Cl 6 Preparation, wherein the purity of aluminum ingot is 99.9%, and the purity of B powder is 96%.

[0030] 2) Prepare 1Kg of master alloy, weigh B powder, aluminum powder, titanium powder, and aluminum ingot as required, and the aluminum burning loss rate is 3%. Al powder is required: B powder: Ti powder = 3.1:2.2:1 (mol), and the rest is Al.

[0031] 3) Heat B powder and Ti powder at 200°C for two hours to remove moisture, take out the powder every 30 minutes and stir to prevent agglomeration.

[0032] 4) Mix the heated powder with titanium powder and aluminum powder evenly, put the evenly mixed powder in the mold, and press it into 15×Φ65mm 3 Cylindrical powder block, the nominal density of the powder block is 4.6g / cm 3 .

[0033] 5) Paint a laye...

Embodiment 3

[0036] Preparation of Al-10TiB by Melt Self-propagating Direct Synthesis 2 The intermediate process is as follows:

[0037] 1) Raw material preparation, the master alloy consists of B powder, Ti powder, aluminum powder, C 2 Cl6 Preparation, wherein the purity of aluminum ingot is 99.9%, and the purity of B powder is 96%.

[0038] 2) Prepare 1Kg of master alloy, weigh B powder, aluminum powder, titanium powder, and aluminum ingot as required, and the aluminum burning loss rate is 3%. Al powder is required: B powder: Ti powder = 3:2.5:1.1 (mol), and the rest is Al.

[0039] 3) Heat B powder and Ti powder at 200°C for two hours to remove moisture, take out the powder every 30 minutes and stir to prevent agglomeration.

[0040] 4) Mix the heated powder with titanium powder and aluminum powder evenly, put the evenly mixed powder in the mold, and press it into 15×Φ65mm 3 Cylindrical powder block, the nominal density of the powder block is 4.6g / cm 3 .

[0041] 5) Paint a layer ...

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Abstract

The invention belongs to the technical field of intermediate alloys, and particularly relates to a nanoscale Al-TiB2 intermediate alloy and a preparation method thereof. The nanoscale Al-TiB2 intermediate alloy is prepared from the components in percentage by mass: 2.2-5.5% of Ti, 1.0-2.5% of B and the balance of Al, the mass percentage of Ti to B is 2.2:1, and the phase composition comprises alpha-Al and TiB2. B powder, Ti powder, Al powder and an aluminum ingot are weighed according to the requirements, wherein the mole ratio of the Al powder to the B powder to the Ti powder is (2.7 to 3.8):(2.2 to 2.7):(1.0 to 1.2); the Ti powder and the B powder are mixed and heated at 200 DEG C; the powder and the Al powder are evenly mixed and then placed in a die to be pressed into a block; and thealuminum ingot is heated, melted and pressed into the block, melt igniting and reacting are waited, the mixture is pressed into C2Cl6 to be refined, and stirring, slagging-off and pouring are conducted. Brittle phases such as TiAl3 do not exist in the prepared intermediate alloy, and the average particle size of the TiB2 is 300 nm or below.

Description

technical field [0001] The invention belongs to the technical field of master alloys, in particular to a nano-scale Al-TiB 2 Master alloy and method for its preparation. Background technique [0002] TiB 2 Due to its low density, low thermal expansion coefficient, high modulus and good coherent relationship with the aluminum matrix, the particles have become widely used reinforcing particles in aluminum matrix composites. endogenous TiB 2 TiB caused by backward production conditions and technical level 2 The particle size is larger and the particles are less, which is mainly reflected in the low B content, poor purity, and the size, shape and distribution of the second phase are not up to standard. At present, a large amount of Al-TiB is prepared industrially by the mixed salt reaction method. 2 Master alloy, its typical production process is: adding K to the aluminum melt at 750-850 2 TiF 6 and KBF 4 , to fully react by mechanical stirring, to prepare Al-TiB 2 mast...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C32/00C22C1/10
CPCC22C21/00C22C32/0073C22C1/1036C22C1/1052
Inventor 陈子勇李中豪王汉光
Owner 大连科天新材料有限公司