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Preparation technology of novel gas chromatography detector

A preparation process and technology of gas chromatograph, which is applied in the field of preparation process of new gas chromatographic detectors, can solve the problems of unsuitable application in occasions with strict requirements for explosion protection, unsuitable for online applications, etc., and achieve excellent sensitivity, high yield, The effect of increasing the density of finished products

Active Publication Date: 2012-06-13
范竞敏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of FID is that it needs nitrogen, hydrogen, air three gas sources and its flow rate control system, which is not suitable for online applications, nor is it suitable for occasions with strict requirements on explosion protection.

Method used

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  • Preparation technology of novel gas chromatography detector
  • Preparation technology of novel gas chromatography detector
  • Preparation technology of novel gas chromatography detector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The raw material of the slurry is 3% molSc 2 o 3 and 8% mol Y 2 o 3 Stable ZrO 2Powder, the average particle size d(0.5) is 0.7μm, and gum arabic is added as a dispersant and binder, and distilled water is used as a solvent. When the volume fraction of the solid phase of the slurry is 18 vol%, and the amount of gum arabic added accounts for 3.0% of the weight of the dry material, it is ball milled in a ball mill for 30 minutes. Pour the slurry that has been sieved and vacuum defoamed into a gypsum mold, and pour out the remaining slurry after standing for 5.5 minutes. After demoulding, the green body is taken out, pre-sintered at 1200°C, trimmed after cooling, and then secondarily sintered at 1600°C to make a long tube detector base. Put the detector substrate into the HF solution and soak it, then clean it and dry it, use a clean and dry small brush to apply a uniform thin layer of the prepared platinum electrode slurry on the electrode part of the sensor substrat...

Embodiment 2

[0030] The raw materials and steps of slurry adjustment are the same as in Example 1. When the amount of gum arabic added accounted for 4% of the weight of the dry material, it was ball-milled in a ball mill for 50 minutes. The grouting time is the same as that of Example 1, and the pre-firing and sintering temperature are the same as that of Example 1. Platinum electrodes are sintered at 1200°C. The measured density is 5.716×10 3 Kg / m 3 , the metal particles on the surface were observed to increase and densify by scanning electron microscopy, and the number of micropores increased and the number decreased.

[0031] It shows that the increase of ball milling time can make the particle size of raw materials smaller. It shows that with the increase of electrode sintering temperature, the electrode metal grains grow gradually, which promotes the increase of the hole diameter on the electrode surface. Experiments show that the electrode sintering temperature is the best at (9...

Embodiment 3

[0033] The raw materials and steps of slurry adjustment are the same as in Example 1. The amount of gum arabic added, the ball milling time and the grouting time are the same as in Example 1. The calcining temperature is the same as in Example 1, but when the sintering temperature is 1400°C, the density of the detector substrate is 5.133×10 3 Kg / m 3 . It shows that the higher the sintering temperature, the greater the density of the detector matrix and the better the compactness, but it can fully meet the several application requirements described in the present invention at 1700 °C, and if the temperature continues to increase, over-burning will occur. And the high temperature has high requirements on the equipment, and the cost is also greatly increased.

[0034] The gypsum master mold of the present invention has a simple structure and is easy to adjust the length and inner diameter of the gypsum mold cavity so as to produce detector substrates of different sizes accordi...

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Abstract

The invention discloses a preparation technology of a novel gas chromatography detector. A process comprises preparation of a plaster die, preparation of a detector matrix and preparation of a signal electrode. The technology includes the steps of: preparing a plaster mold for moulding by a specially-produced plaster master mold; adding gum acacia into a raw material powder of 3% mol Sc2O3 and 8%mol Y2O3-stablized ZrO2 (Sc doped with 8YSZ), adding water and carrying out ball milling to obtain a slurry; carrying out vacuum deaeration treatment on the slurry and injecting the slurry into the self-made plaster mold; carrying out stewing for 5-10 min and pouring residual slurry to form a detector base substrate in a plaster mold cavity; demoulding, pre-burning and sintering to obtain a detector matrix; coating a platinum electrode slurry on the sintered matrix and sintering the electrode at 900-1250 DEG C high temperature to obtain the finished product. According to tests, the novel gas chromatography detector prepared by the method of the invention has high compactness, good crack resistant toughness and long service life.

Description

technical field [0001] The invention relates to a preparation process of a gas sensitive element, in particular to a preparation process of a novel gas chromatography detector. Background technique [0002] In recent years, with the development of industries such as petrochemical industry, power system, environmental monitoring and protection, the common flammable gases such as hydrogen (H 2 ), carbon monoxide (CO), formaldehyde (HCHO), methane (CH 4 ), ethylene (C 2 h 4 ), ethane (C 2 h 6 ), acetylene (C 2 h 2 ), propane (C 3 h 8 ) and other gas monitoring requirements are increasing. Due to the defects of low sensitivity and cross-sensitivity of common single-component combustible gas detectors, for the occasions where multi-component mixed combustible gas needs to be monitored, the industry generally adopts gas chromatography for detection after separation first. In gas chromatography technology, detector technology is its core and key technology, and the level ...

Claims

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Application Information

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IPC IPC(8): G01N30/62
Inventor 胡建良陈君
Owner 范竞敏
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