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A kind of flame retardant performance test method of Ti-Al series intermetallic compound

A technology of intermetallic compounds and flame retardant performance, which is applied in the field of flame retardant performance test of Ti-Al intermetallic compounds, to achieve the effects of improved accuracy, convenient operation and broad application prospects

Active Publication Date: 2018-11-30
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method can only semi-quantitatively characterize the flame retardancy of Ti-Al alloys.

Method used

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  • A kind of flame retardant performance test method of Ti-Al series intermetallic compound
  • A kind of flame retardant performance test method of Ti-Al series intermetallic compound
  • A kind of flame retardant performance test method of Ti-Al series intermetallic compound

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The friction ignition equipment of Beijing Institute of Aeronautical Materials was used for the test, and the material of the test sample was 1 # Ti-Al alloy. The size of the rotor sample 22 is 43mm×27mm×2mm, the apex angle at one end is 120°, the size of the stator sample 15 is 126mm×27mm×2mm, and the diameter of the circular hole 24 is 4mm. The rotation speed of sample 22 is 5000r / min, the gas flow pressure in the cylinder is 0.15MPa~0.25MPa, and the oxygen concentration of the premixed gas flow of air and oxygen is c 0 30% to 100%, the temperature of the sample 15 and the premixed air flow are the same and kept constant, controlled by the CS-type mass flow controller c 0 . The test results are shown in the table below, and the flame retardancy is 95.8%.

[0033]

[0034] Note: Ignite is marked as "+"; not ignited as "-".

Embodiment 2

[0036] The friction ignition equipment of Beijing Institute of Aeronautical Materials was used for the test, and the material of the test sample was 3 # Ti-Al alloy. The size of the rotor sample 22 is 43mm×27mm×2.1mm, the apex angle at one end is 120°, the size of the stator sample 15 is 126mm×27mm×2.1mm, and the diameter of the circular hole 24 is 4mm. The rotation speed of sample 22 is 5000r / min, the gas flow pressure in the cylinder is 0.15MPa~0.25MPa, and the oxygen concentration of the premixed gas flow of air and oxygen is c 0 30% to 100%, the temperature of the sample 15 and the premixed air flow are the same and kept constant, controlled by the CS-type mass flow controller c 0 . The test results are shown in the table below, and the flame retardancy is 38.0%.

[0037]

[0038]

Embodiment 3

[0040] The friction ignition equipment of Beijing Institute of Aeronautical Materials was used for the test, and the material of the test sample was 2 # Ti-Al alloy. The size of the rotor sample 22 is 43mm×27mm×2mm, the apex angle at one end is 120°, the size of the stator sample 15 is 126mm×27mm×2mm, and the diameter of the circular hole 24 is 4mm. The rotation speed of sample 22 is 5000r / min, the gas flow pressure in the cylinder is 0.15MPa~0.25MPa, and the oxygen concentration of the premixed gas flow of air and oxygen is c 0 30% to 100%, the temperature of the sample 15 and the premixed air flow are the same and kept constant, controlled by the CS-type mass flow controller c 0 . The test results are shown in the table below, and the flame retardancy is 80.7%.

[0041]

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Abstract

Belonging to the field of high-temperature structural materials, the invention relates to a test method for the flame retardancy of a Ti-Al intermetallic compound. The method includes: taking a friction pair composed of a rotor sample having one end equipped with a vertex angle and a stator sample having a center equipped with a round hole as the ignition source, adopting the oxygen concentration of air (or inert gas) and oxygen premixed airflow as the control parameter, fixing the premixed airflow temperature and pressure and other parameters at a certain value, adjusting the mass flow controller of a gas supply system by a computer software program, increasing or decreasing the premixed airflow oxygen concentration until a plurality of ignited and non-ignited test points, and filling in a prefabricated table with the test points, when the difference between the premixed airflow oxygen concentrations corresponding to ignited and non-ignited stator samples is less than 1.5%, defining the premixed airflow oxygen concentration corresponding to the non-ignited stator sample as the critical oxygen concentration, and further repeating the test 10 times, and if the stator samples are all non-ignitable, achieving quantitative description of the boundary between ignited and non-ignited samples, i.e. quantitative characterization of the flame retardancy of Ti-Al based alloys.

Description

technical field [0001] The invention belongs to the field of high-temperature structural materials, and relates to an intermetallic compound alloy flame retardant performance test and evaluation technology, in particular to a Ti-Al series intermetallic compound flame retardant performance test method. Background technique [0002] Titanium alloy blades for high-pressure compressors and low-pressure turbines are the core components of high thrust-to-weight ratio aero-engines. Due to the ultra-high temperature and pressure gradients, the working conditions are more complex and harsh, and the tendency and severity of titanium fires are greatly increased. As a result, titanium fire failures occur frequently. More than 100 titanium fires have occurred in military engines and civil engines at home and abroad, which not only caused huge economic losses, but also seriously affected people's large selection of new high-temperature titanium alloys. At present, with the increase of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/12
CPCG01N31/12
Inventor 弭光宝曹京霞黄旭曹春晓
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS