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Method for sealing sample room of mercury porosimeter

A technology of sample chamber and mercury porosimeter, which is applied to the sealing field of sample chamber of mercury porosimeter, can solve the problems of large difference in thickness, position and quality, sample cell rupture, affecting mercury quality, etc., and achieves improved accuracy and precision, extended Service life, reliable test results

Inactive Publication Date: 2011-01-26
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the assembly process of the sample chamber, the technical requirements for sealing with vacuum grease are relatively high. If the assembly is not done properly, it may easily cause the failure of the experiment or the rupture of the sample cell.
Vacuum grease needs to be reapplied for each experiment. Sometimes due to uneven application and air leakage, it is necessary to re-clean the glass grinding port of the sample cell and the stainless steel contact electrode assembly; large, which in turn affects the quality of mercury injected

Method used

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  • Method for sealing sample room of mercury porosimeter
  • Method for sealing sample room of mercury porosimeter
  • Method for sealing sample room of mercury porosimeter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: adopt the U.S. Quan-tachrome company mercury porosimeter, the composition of its sample chamber sees figure 1 , Corresponding to each label are: quartz glass sample cell 1, upper sample cell cover 2, O-ring 3, sample cell grinding port 4, gasket 5, stainless steel electrode contact assembly 6 and lower sample cell cover 7. figure 2 is a cross-sectional view of gasket 5, image 3 is a schematic plan view of the gasket 5, the inner diameter is A, the outer diameter is B, and the thickness is H. Among them, A and B are respectively consistent with the inner and outer diameters of the grinding port of the sample cell. A silicone rubber gasket 5 with a thickness H of 0.5 mm is placed between the ground port 4 of the sample cell and the stainless steel electrode contact assembly 6 to seal the sample chamber. For porous SiO with a pore diameter of 7.3±0.5nm 2 The standard sample was tested, and the vacuum time of the low-pressure mercury injection with a vacu...

Embodiment 2

[0015] Example 2: The test method is the same as in Example 1. A nylon gasket with a thickness of 0.1 mm is used for sealing. The time for vacuuming under low pressure is 13 minutes. The pore diameter obtained by the test is 7.48 nm.

Embodiment 3

[0016] Example 3: The test method is as in Example 1, a rubber gasket with a thickness of 1.0 mm is used for sealing, the time of vacuuming under low pressure is 10 minutes, and the pore diameter obtained by the test is 7.38 nm.

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Abstract

The invention discloses a method for sealing a sample room of a mercury injection apparatus and relates to technology for sealing the sample room of the mercury injection apparatus. The invention provides a method which has simple operation, can be repeatedly used, does not pollute a sample and is used for sealing the sample room of the mercury injection apparatus. A hollow annular washer is arranged between a plane of a polished mouth of a quartz glass sample cell of the mercury injection apparatus and a plane of a stainless steel contact component as an electrode; the size of the inside diameter and the outside diameter of the washer is the same as the polished mouth of the quartz glass sample cell; and the thickness of the washer is between 0.1 and 1.0 mm. The washer can be a molecularmaterial washer, a soft metal washer or a graphite washer. The method adopts the washer to replace vacuum grease to realize the sealing of the sample room; and as the washer is a solid flake with a regular shape, the washer has good deformation and buffering capacity, is simple to operate, does not pollute the sample and can be repeatedly used. Moreover, as the thickness and the diameter of the washer are controllable, the quality of the injected mercury is relatively stable and the accuracy and the precision of the test are improved. Simultaneously, the method is safe and reliable and can prevent the sample cell breaking.

Description

technical field [0001] The invention relates to a technique for sealing a sample chamber of a mercury porosimeter. Background technique [0002] Mercury porosimetry is an advanced instrument and equipment for measuring the microscopic pore structure inside materials by mercury porosimetry. It has the advantages of small sample size, accurate test results and good repeatability. Mercury porosimetry is divided into four steps to determine the pore structure of a substance: sample chamber assembly, sample mercury injection, pressure boost measurement and pressure drop [Zhang Baoming, Zou Fangyong. Shandong Chemical Industry, 1997, (1): 47-50]. During the test, in order to observe whether the mercury in the sample cell is completely filled during low-pressure mercury injection, the sample cell is generally made of quartz glass. The sealing of the sample chamber is completed by pressing the grinding surface of the quartz glass sample cell and the surface of the stainless steel c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N7/10G01N15/08
Inventor 周花戴李宗董炎明陈立富
Owner XIAMEN UNIV
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