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Fisher particle size standard sample and preparation method and application thereof

A standard sample, Fisher particle size technology, applied in particle size analysis, particle and sedimentation analysis, material inspection products, etc., can solve the problems of inability to evaluate the accuracy of test results, instrument differences, large system deviations, and inability to monitor test result deviations, etc.

Pending Publication Date: 2020-09-11
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the Fibonacci particle size standard sample suitable for the production control of cemented carbide raw materials is still blank at home and abroad; there are large systematic deviations between different manufacturers and different instruments, and it is impossible to evaluate the accuracy of the test results and the differences between instruments. ; It is also impossible to monitor the deviation of test results caused by factors such as operators and the environment

Method used

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  • Fisher particle size standard sample and preparation method and application thereof
  • Fisher particle size standard sample and preparation method and application thereof
  • Fisher particle size standard sample and preparation method and application thereof

Examples

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Embodiment 1

[0066] (1) Determine that the particle size of the first group of tungsten powder (tungsten carbide metallurgical powder) is 5 μm, the particle size distribution is a single peak, the diameter of the particle size distribution is not greater than 0.9, and the regular particles (spherical, spherical or square), The surface is smooth, the specific surface area is not more than 0.15m 2 / g; repeated compaction 5 times under 50Ibf pressure, the variation coefficient of D10 particle size distribution value of tungsten powder ≤ 5%, the variation coefficient of D50 particle size distribution value ≤ 3%, the variation coefficient of D90 particle size distribution value ≤ 5%, the cost of tungsten powder The relative standard deviation of the particle size is ≤2%.

[0067] Determine that the particle size value of the second group of tungsten powder (tungsten carbide metallurgical powder) is 25 μm, the particle size distribution is a single peak, the diameter of the particle size distrib...

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Abstract

The invention discloses a Fisher particle size standard sample and a preparation method and application thereof. The preparation method of the Fisher particle size standard sample comprises the following steps: (1) determining the morphology, rigidity, particle size distribution and specific surface area of a raw material; (2) preparing raw material candidates of which the morphology, rigidity, particle size distribution and specific surface area are within the range determined in the step (1); (3) carrying out uniformity inspection on the candidates; (4) after the uniformity test is qualified, randomly extracting candidates, and delivering the candidates to m test mechanisms for collaborative valuing to obtain valued data, where m is greater than or equal to 6; and (5) carrying out mathematical statistical analysis on the constant value data obtained in the step (4), calculating the characteristic value of the Fisher particle size standard sample, and evaluating the uncertainty of thecharacteristic value. The standard sample prepared by the method can meet the requirement of accurate detection of Fisher particle size.

Description

technical field [0001] The invention relates to a Fisherman particle size standard sample, a preparation method and application thereof. Background technique [0002] Air permeation method is a simple and fast method for measuring the average particle size of powder (also known as Fisher particle size). It is characterized by large sampling volume, strong representativeness and good reproducibility. One of the main methods in cemented carbide production has been widely used. Its Fibonacci particle size value is the main parameter of process control in the production process of cemented carbide, and it is also an important quality index of raw materials for production of cemented carbide. It is of irreplaceable importance in the production process of cemented carbide. However, the Fibonacci particle size standard sample suitable for the production control of cemented carbide raw materials is still blank at home and abroad; there are large systematic deviations between differ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02G01N23/2251G01N33/202G01N33/204
CPCG01N15/02G01N15/0211G01N23/2251G01N33/202G01N33/204G01N2223/102G01N2223/635
Inventor 张卫东文丹何继坤
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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