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Si-Y alloy preparation and alloy structure control method for reactive penetration

A technology of impregnation and alloying, which is applied in the control of island structures, band structures, and transitional structures. It can solve problems such as poor structure uniformity, and achieve the effect of uniform structure and uniform interior of the alloy.

Inactive Publication Date: 2018-11-13
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the disadvantage of poor uniformity of Si-Y alloy structure in the prior art, the present invention proposes a method for preparation and structure control of Si-Y alloy for reaction infiltration

Method used

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  • Si-Y alloy preparation and alloy structure control method for reactive penetration
  • Si-Y alloy preparation and alloy structure control method for reactive penetration
  • Si-Y alloy preparation and alloy structure control method for reactive penetration

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Embodiment 1

[0029] This embodiment is a method for preparing and regulating the structure of Si-Y alloy for reactive infiltration. During the preparation process, the solidification rate is controlled within the range of 0.1-0.5mm / min, and the temperature gradient is 150K / cm to obtain a uniform Si-Y eutectic alloy for infiltration with a full band structure. The specific process includes the following steps :

[0030] Step 1: Base material preparation. Using Si powder with a purity of 99999% and Y powder with a purity of 99999% as raw materials, Si-18at% Y master ingot raw materials are prepared according to the eutectic composition. After mixing and briquetting, place it in a vacuum non-consumable arc melting furnace, and keep the vacuum in the furnace less than 1×10 -3 Pa. Set the smelting current to 100A, the melting time to 2min, and carry out the first smelting of the mother ingot raw material. After the first smelting, set the smelting current to 100A and the melting time to 2mi...

Embodiment 2

[0035] This embodiment is a Si-Y eutectic alloy for impregnation that controls the solidification rate within the range of 0.1 to 0.5mm / min, the temperature gradient is 160K / cm, and obtains a uniform full band structure. The specific process includes The following steps:

[0036] Step 1: Base material preparation. Using Si powder with a purity of 99999% and Y powder with a purity of 99999% as raw materials, Si-18at% Y master ingot raw materials are prepared according to the eutectic composition. After mixing and briquetting, place it in a vacuum non-consumable arc melting furnace, and keep the vacuum in the furnace less than 1×10 -3 Pa. Set the smelting current to 100A, the melting time to 2min, and repeat the smelting 4 times to obtain the Si-Y eutectic alloy master ingot.

[0037] Step 2: Clamping and assembly. The Si-Y eutectic alloy master ingot is broken into small pieces with an equivalent diameter of less than 3 mm and placed in a corundum tube. The corundum tube s...

Embodiment 3

[0041] This embodiment is a Si-Y eutectic alloy for infiltration that controls the solidification rate within the range of 0.1-0.5mm / min, and the temperature gradient is 170K / cm to obtain a uniform full band structure. The specific process includes The following steps:

[0042] Step 1: Base material preparation. Using Si powder with a purity of 99999% and Y powder with a purity of 99999% as raw materials, Si-18at% Y master ingot raw materials are prepared according to the eutectic composition. After mixing and briquetting, place it in a vacuum non-consumable arc melting furnace, and keep the vacuum in the furnace less than 1×10 -3 Pa. Set the smelting current to 100A, the melting time to 2min, and repeat the smelting 4 times to obtain the Si-Y eutectic alloy master ingot.

[0043] Step 2: Clamping and assembly. The Si-Y eutectic alloy master ingot is broken into small pieces with an equivalent diameter of less than 3 mm and placed in a corundum tube. The corundum tube siz...

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Abstract

The invention provides a Si-Y alloy preparation and alloy structure control method for reactive penetration. During the solidification process, the solidification rate can be changed so as to meet different microscopic structure requirements; the temperature gradient can be kept at 150-240 K / cm; and along with the change of the solidification rate from 0.1 mm / min to 3.0 mm / min, uniform full strip-shaped structures, transition structures for evolution from the strip shape to the island shape, and uniform full island-shaped structures can be acquired separately. A smelting parameter range acquired through the Si-Y alloy preparation and alloy structure control method is not limited to a directional solidification smelting method, and can be applied to an electric resistance smelting method, an induction smelting method, a laser smelting method and the like; through the combination with the own solidification rate regulation situations, various processes can be regulated within a solidification rate range proposed by the Si-Y alloy preparation and alloy structure control method; and different morphologies of uniform full eutectic structures without the primary Si phase can be acquired.

Description

technical field [0001] The invention relates to the field of structure control of alloys, in particular to the regulation and control of band structure, transition structure and island structure of Si-Y alloy for reaction infiltration. Background technique [0002] The reactive infiltration method is the method with the most industrialization potential for the preparation of SiC fiber reinforced SiC composites. However, due to the high melting point of traditional Si alloys for infiltration, for example, the melting point of Si-Zr eutectic composition alloy is 1370°C, the melting point of Si-Ti eutectic composition alloy is 1330°C, and the melting point of Si-Mo eutectic composition alloy is 1400°C. , which is higher than the ablation resistance temperature (1300°C) of SiC fibers, will cause the SiC fibers to be severely ablated and fail during the impregnation process. Compared with the above traditional alloys for infiltration, Si-Y alloy has a lower melting point of 1215...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C28/00
CPCC22C1/03C22C28/00
Inventor 胡锐李劲光杨劼人
Owner NORTHWESTERN POLYTECHNICAL UNIV
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