A kind of nb-tial layered composite material and preparation method thereof

A layered composite material and composite material technology are applied in the field of Nb-TiAl layered composite material and its preparation, which can solve the problems of near-formed preparation of sheet shape and complexity, and achieve the effect of avoiding forming processing and simple process.

Active Publication Date: 2021-06-22
HARBIN INST OF TECH
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  • Description
  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to solve the current problem that it is impossible to improve the plasticity and toughness of TiAl alloy at room temperature, and to prepare plates or structural parts with complex shapes by near-forming, and to provide a Nb-TiAl layered composite material and its preparation method. While improving the ductility and toughness of TiAl alloy at room temperature, it can form plates or other structural parts with complex shapes

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  • A kind of nb-tial layered composite material and preparation method thereof
  • A kind of nb-tial layered composite material and preparation method thereof
  • A kind of nb-tial layered composite material and preparation method thereof

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specific Embodiment approach 1

[0020] Specific embodiment 1: This embodiment describes a kind of Nb-TiAl layered composite material, and the described Nb-TiAl layered composite material is made of periodic Nb / Ti 3 Al-TiAl / Nb structure composition, Nb is pure Nb, between the upper and lower pure Nb layers, alternately set Ti 3 Al layer and TiAl layer, and constitute a periodic stacked structure.

[0021] Specific embodiment 2: A kind of Nb-TiAl layered composite material described in specific embodiment 1, the thickness of the single layer of pure Nb layer is 20~50 μm, it is mainly used as the toughness layer of the composite material, and has good High temperature resistance.

[0022] Specific embodiment three: a kind of Nb-TiAl layered composite material described in specific embodiment one, the Ti 3 The thickness ratio of the Al layer to the TiAl layer is 1:1~2, which can be adjusted by adjusting the thickness ratio of the raw materials Ti foil and Al foil during the preparation process or by controllin...

specific Embodiment approach 5

[0024] Embodiment 5: A method for preparing the Nb-TiAl layered composite material described in any of Embodiments 1 to 4, the method is carried out according to the following steps:

[0025] Step 1: Use alcohol and acetone to ultrasonically clean Ti foil, Al foil and Nb foil respectively (power 2000W) for 5 to 10 minutes to remove surface oil, and then use 5vol.% to 15vol.% HF, 100vol.% HF and 5vol .% ~ 15vol.% NaOH solution to clean the surface of Ti foil, Nb foil and Al foil respectively to remove the scale on the surface, and finally use alcohol ultrasonic (power 2000W) to clean for 2 ~ 5min, then dry it with a hair dryer for later use;

[0026] Step 2: Laminate the Ti foil, Al foil and Nb foil washed in step 1. In order to ensure that the cross-section of all foils is the same during sample loading and hot pressing, wrap the stacked materials with graphite paper , and use a steel wire with a diameter of 0.1 to 0.2mm to fix the stack to obtain a Nb / high Nb-TiAl layered com...

Embodiment 1

[0039] 1. First use alcohol and acetone to ultrasonically clean Ti foil, Al foil and Nb foil respectively for 5 minutes to remove surface oil, and then use 10vol.% HF, 100vol.% HF and 10vol.% NaOH solutions to clean Ti foil, Nb foil and Al foil to clean the surface to remove the scale on the surface, and finally use alcohol to ultrasonically clean it for 5 minutes, then dry it with a hair dryer for later use; the thickness of the Ti foil is 20 μm, the thickness of the Al foil is 17 μm, and the thickness of the Nb foil The thickness is 25μm;

[0040] 2. Stack the Ti foil, Al foil and Nb foil washed in step 1. The stacking sequence is that the Nb foil is at the top and bottom of a cycle of stacking, and the middle layer is alternate Ti foil and Al foil; In order to ensure that all foil materials are always in one plane during sample loading and hot pressing, the stacked materials are coated with graphite, and the stack is fixed with a steel wire with a diameter of 0.15mm to prep...

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Abstract

A Nb-TiAl layered composite material and a preparation method thereof belong to the technical field of alloy preparation. The invention aims to solve the problems that the TiAl alloy is inherently brittle, has low plasticity and toughness at room temperature, and is difficult to process and shape. A Nb-TiAl layered composite material is composed of periodic Nb / high Nb-TiAl alloy structure. Method: 1. Surface cleaning of Ti foil, Al foil and Nb foil; 2. Lamination of washed Ti foil, Al foil and Nb foil to prepare prefabricated parts; 3. Low temperature heat treatment; 4. Medium temperature annealing; 5. It can be obtained by high temperature densification. The invention is used for preparing Nb-TiAl layered composite material, and can be used to form Nb-TiAl layered composite material with other complex shapes such as plates.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a Nb-TiAl layered composite material and a preparation method thereof. Background technique [0002] TiAl alloy has excellent high temperature performance, good oxidation resistance, high specific strength, specific modulus and other characteristics, and has broad application prospects in automobile manufacturing, aerospace and other fields. However, TiAl alloy has intrinsic brittleness, low damage tolerance, low room temperature plasticity and low toughness. The processing of high Nb-TiAl alloys is not only complicated but also costly. Based on this, how to improve the ductility and toughness of TiAl alloy at room temperature and how to form plates or other structural parts with complex shapes is an urgent problem to be solved at present. Contents of the invention [0003] The purpose of the present invention is to solve the current problem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/01B32B15/20C22F1/04C22F1/18
CPCB32B15/017B32B2250/42C22F1/04C22F1/183
Inventor 王斌斌李东海骆良顺徐严谨韩宝帅王亮苏彦庆郭景杰
Owner HARBIN INST OF TECH
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