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Al-TiB2 pure-phase intermediate alloy with high volume fraction and preparation method thereof

A kind of master alloy, al-tib2 technology, applied in the field of environment-friendly low-cost large volume fraction Al-TiB2 master alloy preparation, can solve the problems of high preparation cost, pollution, poor performance of composite materials, etc., and achieve uniform distribution and small particle size Effect

Active Publication Date: 2017-09-22
大连科天新材料有限公司
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  • 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 Phase exists, the length is generally about 100 μm, this phase will be used as a brittle phase in the composite material, which is not good for the performance of the composite material
TiB in tissue 2 Most of the particles exist in the form of aggregates, and the particles inside the aggregates stick together, and 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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  • Al-TiB2 pure-phase intermediate alloy with high volume fraction and preparation method thereof
  • Al-TiB2 pure-phase intermediate alloy with high volume fraction and preparation method thereof
  • Al-TiB2 pure-phase intermediate alloy with high volume fraction and preparation method thereof

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Effect test

Embodiment 1

[0022] Preparation of Al-10TiB by Melt Self-propagating Direct Synthesis 2 (TiB 2 The mass percentage composition is 10%) intermediate process is as follows:

[0023] 1. Raw material preparation, refiner by H 3 BO 3 、TiO 2 , aluminum powder, titanium powder, aluminum ingot, C 2 Cl 6 Preparation, wherein the purity of the aluminum ingot is 99.9%.

[0024] 2. Prepare 1Kg of master alloy, weigh H as required 3 BO 3 、TiO 2 , aluminum powder, titanium powder, aluminum ingots, the aluminum burning loss rate is 3%. require H 3 BO 3 : TiO 2 : The molar ratio of Al powder: Ti powder=4:1:4:1, and the rest are Al ingots.

[0025] 3 will H 3 BO 3 、TiO 2 The powder is heated at 200°C for two hours to remove moisture, and the powder is taken out every 30 minutes for stirring to prevent agglomeration.

[0026] 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 The cylindrical powder...

Embodiment 2

[0030] Preparation of Al-15TiB by Melt Self-propagating Direct Synthesis 2 (TiB 2 The mass percentage of

[0031] 15%) The intermediate process is as follows:

[0032] 1. Raw material preparation, refiner by H 3 BO 3 、TiO 2 , aluminum powder, titanium powder, aluminum ingot, C 2 Cl 6 Preparation, wherein the purity of the aluminum ingot is 99.9%.

[0033] 2. Prepare 1Kg of master alloy, weigh H as required 3 BO 3 、TiO 2 , aluminum powder, titanium powder, aluminum ingots, the aluminum burning loss rate is 3%. require H 3 BO 3 : TiO 2 : The molar ratio of Al powder: Ti powder=4:1:4:1, and the rest are Al ingots.

[0034] 3 will H 3 BO 3 、TiO 2 The powder is heated at 200°C for two hours to remove moisture, and the powder is taken out every 30 minutes for stirring to prevent agglomeration.

[0035] 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 The cylindrical powder...

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Abstract

Al-TiB2 pure-phase intermediate alloy with a high volume fraction and a preparation method thereof belong to the technical field of intermediate alloy. The mass percent of B is 1.0-2.5%, the molar ratio of Ti / B is 1 / 2, the balance is Al, and a phase composition comprises alpha-Al and TiB2. The preparation method comprises the following steps: weighing H3BO3, TiO2, Al powder, Ti powder and aluminum ingots with the purity of 99.9%, wherein the molar ratio of H3BO3, TiO2, Al powder and Ti powder is (3.5-5.2):(0.5-2.1):(3.5-5.7):(0.2-1.5); mixing TiO2 with H3BO3, and performing uniform drying; mixing the heated powder with aluminum powder, placing the mixed powder in a die, and pressing the mixed powder into a block; and heating the aluminum ingots to be molten, pressing the melt into the block to enable ignition and reaction, after reaction, pressing C2C16 into the reactant, and then performing refining, stirring, drossing and casting. As a low-cost oxide serves as the raw material, the prepared intermediate alloy contains no brittle phases such as TiAl3.

Description

technical field [0001] The invention belongs to the technical field of master alloys, in particular to an environment-friendly low-cost Al-TiB with large volume fraction 2 Master alloy preparation method. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C1/10
CPCC22C1/026C22C1/03C22C1/1015C22C1/1068
Inventor 陈子勇李贺王海靖马铁军柴丽华金头男
Owner 大连科天新材料有限公司
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