A pretreatment method for observing titanium fiber metallographic structure sintering neck

A technology of metallographic structure and titanium fiber is applied in the field of pretreatment for observing the metallographic structure of titanium fiber sintered neck, which can solve the problem that the corrosion solution and the observation method cannot clearly and completely observe the metallographic structure of titanium fiber porous materials, and achieve Clear grain boundaries and good corrosion effect

Active Publication Date: 2017-11-28
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
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Problems solved by technology

[0005] Aiming at the defects and deficiencies in the prior art, the purpose of the present invention is to provide a pretreatment method for observing the metallographic structure of titanium fiber sintering neck, which solves the problem that the existing corrosive liquid and observation method cannot clearly and completely observe the porous titanium fiber The metallographic structure of the material and the problem that the sintering phenomenon between the fibers cannot be clearly observed to form a sintering neck, and the effective metallographic analysis and research on the metallographic sintering neck of titanium fiber porous materials

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  • A pretreatment method for observing titanium fiber metallographic structure sintering neck
  • A pretreatment method for observing titanium fiber metallographic structure sintering neck
  • A pretreatment method for observing titanium fiber metallographic structure sintering neck

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Embodiment 1

[0032] This embodiment provides a method for observing the sintering neck of the titanium fiber porous material metallographic structure. The method specifically includes the following steps:

[0033] Step 1, sample cleaning:

[0034] After the titanium fiber porous material (square size 24mm × 24mm × 31mm) is obtained, the wire diameter is 70-120um, and the porosity is 40%-60%. Wash for 3 to 5 minutes, then rinse with water for 3 minutes, rinse off the HCl solution, then wash the sample with pure hydrofluoric acid solution for 5 to 8 minutes, and then rinse with water for 2 to 4 minutes, rinse off the hydrofluoric acid solution, the solution If the concentration is high, pay attention to splashing and keep the fume hood ventilated; then place a measuring cup in an ultrasonic cleaner, add 100ml of absolute ethanol to the measuring cup, soak and clean the sample in absolute ethanol for 20 minutes, and then take out the sample. Air-dried at low temperature and sealed for storag...

Embodiment 2

[0048] The difference between this embodiment and embodiment 1 is:

[0049] The components of the metallographic etching solution for titanium fiber porous materials include analytically pure hydrofluoric acid, analytically pure nitric acid, and hydrochloric acid with a mass fraction of 35%. In the etching solution, HF: HNO3: 35% HCl=4ml: 2ml: 10ml are used respectively ( image 3 a) and HF:HNO 3 : 35% HCl=4ml: 2ml: 4ml ( image 3 b).

[0050] Take the sample after the secondary corrosion, observe the metallographic sintering neck of the titanium fiber porous material under a microscope, and observe the sintering effect of the sample: as image 3 As shown in a, observe the metallographic structure and find that the metallographic structure is blurred; as image 3 As shown in b, observing the metallographic structure, the metallographic structure at the sintered node of the titanium fiber porous material can be clearly observed.

Embodiment 3

[0052] The difference between this embodiment and embodiment 1 is that

[0053] Step 4, prepare metallographic etching solution: uniformly mix and prepare metallographic etching solution for titanium fiber porous material according to the following formula: the components of metallographic etching solution for titanium fiber porous material include analytically pure hydrofluoric acid, analytically pure nitric acid, and the mass fraction is 35 % hydrochloric acid, in the corrosion solution, use HF respectively: HNO3: 35% HCl=10ml: 1ml: 2ml ( Figure 4 a), HF: HNO3: 35% HCl=1ml: 8ml: 4ml ( Figure 4 b) and HF: HNO3: 35% HCl=4ml: 2ml: 4ml ( Figure 4 c).

[0054] Observe the metallographic sintering neck of the titanium fiber porous material under the microscope, and observe the sintering effect of the sample: as Figure 4 As shown in a and 4b, observe the metallographic structure and find that the metallographic structure is blurred; Figure 4 As shown in c, observing the me...

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Abstract

The invention discloses a pretreatment method for observing the sintering neck of titanium fiber metallographic structure. The method includes corroding the cleaned, sintered and mounted titanium fiber sample with corrosive liquid, and the corrosive liquid includes hydrofluoric acid, Nitric acid and hydrochloric acid; in parts by volume, the corrosive solution contains 1-10 parts of hydrofluoric acid, 1-8 parts of nitric acid and 1-10 parts of hydrochloric acid. The grain boundary of the metallographic structure observed by the method of the present invention is clear and complete, and no corrosion pits and plaques appear in a single grain. Titanium fiber porous material is of great significance.

Description

technical field [0001] The invention belongs to the field of metallographic corrosion of titanium and titanium alloys, in particular relates to titanium fiber porous materials, in particular to a pretreatment method for observing the sintering neck of the titanium fiber metallographic structure. Background technique [0002] Metal fiber porous materials (such as figure 1 ) Its unique three-dimensional network fiber skeleton and fully connected pore structure enable it to have a series of special functions, which are applied in the fields of filtration and separation, sound absorption and noise reduction, electromagnetic shielding, high-efficiency combustion and enhanced heat transfer. Titanium and titanium alloys have the characteristics of light specific gravity, high specific strength, good corrosion resistance, non-magnetic, weldable, and wide temperature range. Sintered into a porous material. The sintering process of metal fiber porous materials is affected by many fa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/32G01N1/34G01N1/44
Inventor 刘世锋汤慧萍张朝晖冯璐刘全明
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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