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Corrosive agent for Nb - Si material microstructure specimens and an electrolyte corrosion technique

A technology of microstructure and corrosive agent, which is applied in the field of metallographic analysis in physical metallurgy, can solve the problems of waste of manpower and material resources, inability to distinguish alloys well, restrictions, etc., and achieve the effect of improving convenience

Active Publication Date: 2015-08-19
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the Nb-Si series material is a new type of structural material, and its composition phase is completely different from the existing mature system materials, such as steel, aluminum alloy, titanium alloy, superalloy, etc., using the existing corrosive agent, for Nb -The composition phase of Si-based materials can produce corrosion, resulting in more false images. The composition phase of the alloy cannot be well resolved by optical microscope observation. It is necessary to use the backscattered electron imaging function of the scanning electron microscope for observation. In large-size samples There are certain limitations in multi-regional observation, and a lot of manpower and material resources are wasted

Method used

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  • Corrosive agent for Nb - Si material microstructure specimens and an electrolyte corrosion technique
  • Corrosive agent for Nb - Si material microstructure specimens and an electrolyte corrosion technique
  • Corrosive agent for Nb - Si material microstructure specimens and an electrolyte corrosion technique

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Prepare the Nb-Si series material microstructure sample according to the following steps:

[0023] 1) Corrosive agent configuration: measure 1ml H with graduated cylinder 3 PO4 and 99ml H 2 O, first the measured H 2 O was placed in a glass beaker, and then the measured H 3 Pour PO4 into the beaker and stir with a glass rod for about 30s;

[0024] 2) Polish the Nb-22Ti-16Si-3Cr-3Al-2Hf material sample prepared by vacuum non-consumable arc melting, and connect it to a DC power supply XD173A-120 with a rated working voltage of 120V and a rated working current of 3A through a wire The anode of the stainless steel plate is connected to the cathode of the power supply through a wire, and the polished surface of the Nb-22Ti-16Si-3Cr-3Al-2Hf sample is kept opposite to the stainless steel plate, but cannot be contacted;

[0025] 3) Turn on the switch of the DC power supply, quickly adjust the voltage to 80V, observe the change of the current, and turn off the DC power switch...

Embodiment 2

[0029] Prepare the Nb-Si series material microstructure sample according to the following steps:

[0030] 1) Corrosive agent configuration: measure 1ml H with graduated cylinder 3 PO4 and 99ml H 2 O, first the measured H 2 O was placed in a glass beaker, and then the measured H 3 Pour PO4 into the beaker and stir with a glass rod for about 30s;

[0031] 2) Polish the crystallization front sample of Nb-20Ti-16Si-3Cr-3Al-2Hf material directional solidified in an electromagnetic cold crucible, and connect it to the DC power supply XD173A-120 with a rated working voltage of 120V and a rated working current of 3A through a wire Anode, the stainless steel plate is connected to the cathode of the power supply through a wire, and the polished surface of the Nb-22Ti-16Si-3Cr-3Al-2Hf sample is kept opposite to the stainless steel plate, but cannot be contacted;

[0032] 3) Turn on the switch of the DC power supply, quickly adjust the voltage to 70V, observe the change of the current...

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Abstract

The invention relates to a corrosive agent for Nb - Si material microstructure specimens and an electrolyte corrosion technique which belongs to metallographic analysis of physical metallurgy field. The invention uses solution of H3PO4 and H2O, and the volume is 98% H3PO4 : H2O is 1 to 99. The polished Nb - Si material is used as positive pole, and stainless as negative pole. Direct current source is used to process electrolyte corrosion, and then Nb - Si material microstructure specimens is made, and thus the composition phases and microstructure morphology of the Nb - Si material can be rapid and conveniently analyzed via an optical microscope.

Description

technical field [0001] The invention belongs to the field of metallographic analysis in physical metallurgy, and relates to an etchant and an electrolytic corrosion method for preparing Nb-Si series material microstructure samples. Background technique [0002] The increase of the thrust-to-weight ratio of gas turbine engines strongly depends on the increase of the inlet temperature before the high-pressure turbine. The temperature at the front inlet of the new-generation engine with a thrust-to-weight ratio of 15-20 is as high as 2100-2200K. Considering the cooling effect of the air-cooling structure of the blade itself and the heat insulation effect of the thermal barrier coating, the temperature bearing between the guide of the high-pressure turbine and the working blade itself The capacity must reach above 1150°C, which greatly exceeds the limit temperature bearing capacity of current nickel-based high-temperature metal materials (working temperature does not exceed 1120...

Claims

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Application Information

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IPC IPC(8): C25F3/08G01N1/32
Inventor 康永旺李明郭丰伟
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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