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A Statistical Method for Identifying {110} Crystal Planes and Surface Shares of Tungsten Single Crystal Coatings

A {110}, statistical method technology, applied in the field of thermionic fuel cells, can solve the problems of limiting the electrochemical etching process parameters, such as the thermoelectric conversion efficiency of the emitter coating, and achieve the statistical method is simple and easy to operate, simple and convenient to operate, and convenient Statistical effect of facet share

Active Publication Date: 2019-03-26
海朴精密材料(苏州)有限责任公司
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  • Application Information

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Problems solved by technology

However, there is currently a lack of a simple method for the identification and share statistics of {110} crystal planes, which greatly limits the optimization of electrochemical etching process parameters and the improvement of thermoelectric conversion efficiency of emitter coatings.

Method used

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  • A Statistical Method for Identifying {110} Crystal Planes and Surface Shares of Tungsten Single Crystal Coatings
  • A Statistical Method for Identifying {110} Crystal Planes and Surface Shares of Tungsten Single Crystal Coatings

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Embodiment

[0025] Weigh 10g NaOH and 10g K respectively successively 3 Fe(CN) 6 Reagent, placed in a beaker, slowly add 100ml deionized water (20°C) into the beaker while stirring, and use ultrasonic waves to make NaOH and K 3 Fe(CN) 6 All solid reagents are dissolved and used as corrosive solution. Put the polished cylindrical tube with tungsten single crystal coating in the corrosion solution, and take it out after 30s. Rinse with deionized water and wipe clean with a cotton dampened with alcohol. Then observe with a metallographic microscope, take the first metallographic photo at the position of 0° along the circumference of the cylindrical tube, and then take the second metallographic photo at the position of 3°, successively at 6°, 9°, 12°,..., 354° , Take the 3rd, 4th, 5th, ..., 119th, and 120th metallographic photos at 357°, in which the topography of incomplete diamond-shaped pits is as follows figure 1 As shown, it is the {110} crystal plane; the morphology of the trapezoi...

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Abstract

The invention relates to a tungsten single crystal coating layer {110} crystal plane recognition and surface portion statistical method, belongs to the technical field of thermionic fuel battery, and especially can be used for guiding optimization of electrochemical etching process parameters. The method includes three steps of chemical corrosion recognition of a tungsten single crystal {110} crystal plane, statistic of the accounting portion of the {110} crystal plane and improvement of the accounting portion by an electrochemical method, wherein a chemical corrodent used in the chemical corrosion recognition of the crystal plane is prepared from NaOH, K3Fe(CN)6 and deionized water, and each 100 ml of the corrodent contains 9-12 g of NaOH and 8-11 g of K3Fe(CN)6. The {110} crystal plane is identified according to corrosion pit morphology characteristics, then one metallographic photo is shot at each 2 degrees-6 degrees through an automatic zoom imaging technology, the total degree of the {110} accounting for the entire circumference is on statistic and the surface portion is obtained; the method has the advantages of simple and convenient operation, clear corrosion pits, high identification degree, simple and feasible statistic method and the like.

Description

technical field [0001] The invention relates to a tungsten single crystal coating {110} crystal plane identification and statistical method for surface share, which belongs to the technical field of thermionic fuel cells, and in particular can guide the optimization of electrochemical etching process parameters. Background technique [0002] Thermionic fuel cell is currently the most successful form of high-power space nuclear power supply. Its main component is a thermionic energy converter, and the surface characteristics of the emitter of the converter will directly affect its thermoelectric conversion efficiency. Using tungsten single crystal with preferred orientation of {110} crystal plane as emitter coating material can improve thermoelectric conversion efficiency. However, there is currently a lack of a simple method for the identification and share statistics of the {110} crystal plane, which greatly limits the optimization of the electrochemical etching process par...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/32C30B33/10C23F1/38
CPCC23F1/38C30B33/10G01N1/32
Inventor 张鹏杰郭雨竹周倩史佳庆么斯雨张松沈艳波于晓东谭成文
Owner 海朴精密材料(苏州)有限责任公司
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