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Device and method for measuring content of free carbon in boron carbide

A measuring device and measuring method technology, applied in the field of analytical chemistry, to achieve the effects of easy observation, good repeatability of results and good reliability

Inactive Publication Date: 2017-05-10
SHANDONG NON METALLIC MATERIAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses a microcoulomb detection system, and the equipment is highly specific. For some laboratories that do not have the conditions, this method has certain limitations.

Method used

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  • Device and method for measuring content of free carbon in boron carbide
  • Device and method for measuring content of free carbon in boron carbide
  • Device and method for measuring content of free carbon in boron carbide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take the three-stage absorption experimental device as an example to illustrate the technical scheme involved in the present invention. The experimental device is as attached figure 1 As shown, four 100ml gas washing bottles are connected sequentially, the end washing bottle is a sedimentation bottle, and the other three are absorption bottles, the air washing bottle inlet is connected to the reaction bottle, and the exhaust end is connected to the sedimentation bottle; the reaction bottle The No. 7 gas washing bottle in front is a carrier gas purification bottle, which contains 40% potassium hydroxide solution, which is used to absorb trace carbon dioxide gas that may exist in the carrier gas; carrier gas source, carrier gas purification bottle 7, reaction bottle, absorption group and The settling bottles are sequentially connected to form a closed gas system, and the exhaust end of the settling bottles is emptied to obtain the experimental device involved in the presen...

Embodiment 2

[0039] Take the secondary absorption experimental device as an example to illustrate the technical scheme involved in the present invention. For the experimental device, refer to the attached figure 1 To build, the absorption bottle is connected in sequence by three 100ml washing bottles, the end washing bottle is a sedimentation bottle, and the other two are absorption bottles, the inlet end of the washing bottle is connected to the reaction bottle, and the exhaust end is connected to the sedimentation bottle; The No. 7 gas washing bottle in front of the reaction bottle is a carrier gas purification bottle, which contains 40% potassium hydroxide solution, which is used to absorb trace carbon dioxide gas that may exist in the carrier gas; carrier gas source, carrier gas purification bottle 7, reaction bottle, absorption The group and the settling bottle are sequentially connected to form a closed gas system, and the exhaust end of the settling bottle is emptied to obtain the ex...

Embodiment 3

[0048] Take the five-stage absorption experimental device as an example to illustrate the technical scheme involved in the present invention. For the experimental device, refer to the attached figure 1 Set up, the absorption bottle is connected in sequence by six 100ml gas washing bottles, the end washing bottle is a sedimentation bottle, and the remaining five are absorption bottles, the air washing bottle inlet is connected to the reaction bottle, and the exhaust end is connected to the sedimentation bottle; The No. 6 gas washing bottle in front of the reaction bottle is a carrier gas purification bottle, which is filled with potassium hydroxide solution, and is used to absorb trace amounts of carbon dioxide gas that may exist in the carrier gas; carrier gas source, carrier gas purification bottle 6, reaction bottle, absorption group and The settling bottles are sequentially connected to form a closed gas system, and the exhaust end of the settling bottles is emptied to obtai...

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Abstract

The invention belongs to the field of analytical chemistry. A sodium dichromate-concentrated sulfuric acid-potassium iodate system serves as an oxidizing agent, the carbon dioxide produced in the reaction is collected by a standardized sodium hydroxide solution, a barium salt serves as a carbonate masking agent, and the content of free carbon in the sample is obtained by an acid base titration method. The device for measuring content of free carbon in boron carbide disclosed by the invention is composed of an oxidizing device, a gas absorption device and a titration device, and is characterized in that the gas absorption device is composed of a group of absorption bottles (1) connected in series and a precipitating bottle (2); the air inlet end of the absorption bottle group is connected with the oxidizing device (3), and the air outlet end of the absorption bottle group is connected with the precipitating bottle (2); the standardized sodium hydroxide solution (4) is filled in the absorption bottle; and a mixed solution (5) of barium chloride and sodium hydroxide is filled in the precipitating bottle. The device is simple in structure, convenient to use, high in gas circuit sealing property and high in reliability. According to the measurement method, the endpoint is easy to observe, the operability is high, the data repeatability is high, and the accuracy is high. The device and the method are suitable for detection of the free carbon in the boron carbide.

Description

[0001] Technical field [0002] The invention belongs to the field of analytical chemistry, and relates to free carbon oxidation treatment, gas collection and detection technology. Background technique [0003] Boron carbide powder is widely used in abrasives and high-hardness ceramics. At present, boron carbide powder is mostly sintered into blocks at high temperature, crushed by airflow or ball mill, and then separated step by step. During the refining process of boron carbide powder, the free carbon content in the powder increases with the increase of crushing time, which affects the quality of the powder. [0004] The carbon element in boron carbide exists in two forms: free carbon and combined carbon. As long as the content of free carbon and total carbon is measured, the content of combined carbon can be known, so as to judge the quality of the product. The determination of total carbon can be determined by the classic combustion gas absorption method and infrared carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 冀克俭李艳玲邵鸿飞赵晓刚高岩立李颖周彤邓卫华刘元俊华兰
Owner SHANDONG NON METALLIC MATERIAL RES INST
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