A method for controlling defects and cracking of feal intermetallic layered composites
A technology of layered composite materials and intermetallic compounds, which is applied in the field of preparation of intermetallic compound layered composite materials, can solve problems such as cracking of Al-containing intermetallic compounds, limited engineering applications of composite materials, and large difference in hardness at the laminated interface. Solve the effects of longer reaction cycle, shorter solid phase reaction time, and faster reaction speed
Active Publication Date: 2021-09-10
HARBIN ENG UNIV
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Problems solved by technology
On the one hand, the structural changes on both sides of the interface lead to a large difference in hardness at the laminate interface, which increases the probability of interlayer cracking under stress
On the other hand, the Al-containing intermetallic compound layer also has "middle line" defects formed by the accumulation of impurities such as oxides, and the Al-containing intermetallic compound cracks during cooling.
These problems greatly limit the engineering application of this type of composite materials
Method used
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[0025] Attached below Figure 1-5 The present invention is further described.
[0026] The invention belongs to the field of preparation of intermetallic compound layered composite materials, and specifically relates to a method for controlling defects and cracks of FeAl intermetallic compound layered composite materials by adopting a "multi-thin foil" structure and a "two-stage" reaction. The purpose is to provide a method for preparing FeAl intermetallic compound layered composite material with "multi-thin foil" structure and "two-stage" reaction to control defects and cracking of FeAl intermetallic compound layered composite material.
[0027] For realizing the purpose of the present invention, the technical scheme that adopts is:
[0028] A method for controlling defect and cracking of FeAl intermetallic compound layered composite material, comprising the steps of:
[0029] Step 1: Use an industrial scouring pad to polish the foil from the horizontal, vertical and 45° di...
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Abstract
The invention belongs to the field of preparation of intermetallic compound layered composite materials, and aims to provide a method for "controlling the defects and cracks of FeAl intermetallic compound layered composite materials, comprising the following steps: firstly, the foil is subjected to surface treatment, and then the prefabricated The good foil materials are staggered and placed in a vacuum hot-pressing sintering furnace for hot-pressing sintering; then heating and heat preservation are carried out in two stages, and finally the sample and the mold are cooled to room temperature with the furnace. The invention has a fast reaction speed and effectively shortens the solid The corresponding reaction time solves the problem of long iron-aluminum reaction cycle, maximizes the crack bridging effect, and the sample has good compactness, which effectively eliminates the "middle line" formed by impurities such as oxides; at the same time The invention has low cost and high yield, and can also prepare iron-aluminum series layered electrode composite materials by changing parameters and using raw materials with different proportions.
Description
technical field [0001] The invention belongs to the field of preparation of intermetallic compound layered composite materials, and specifically relates to a method for controlling defects and cracks of FeAl intermetallic compound layered composite materials by adopting a "multi-thin foil" structure and a "two-stage" reaction. Background technique [0002] Metal-Intermetallic-Laminate (MIL) composite material is based on the principle of bionics, simulating the shell structure in nature, with high hardness, high modulus, low density intermetallic compound layer and good plasticity and toughness A micro-laminate composite material obtained by overlapping metal layers. This kind of micro-laminated composite material can effectively improve the toughness of intermetallic compounds and the ability to resist crack propagation through small interlayer spacing and multi-interface effects. In addition, due to the unique laminated structure and special failure mode of the composite ...
Claims
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IPC IPC(8): B32B37/06B32B37/10B32B38/00B32B38/16B32B15/18B32B15/20B32B15/01
CPCB32B15/012B32B15/18B32B15/20B32B37/06B32B37/1009B32B38/0012B32B38/162B32B38/164B32B2038/0016B32B2250/40
Inventor 姜风春郑雨晴王振强果春焕万金鑫
Owner HARBIN ENG UNIV