Method for measuring powder hardness

A measurement method and powder technology, applied in the field of material science, can solve the problems of expensive instruments, high maintenance costs, demanding powder materials and surface conditions, etc., and achieve high reproducibility, strong operability, and high measurement results. accurate effect

Inactive Publication Date: 2015-04-29
南京汉旗新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] Since the powder itself cannot directly measure the hardness, and most hardness measuring instruments are designed for the measurement of the flat surface of a flat solid (or film), although the microhardness method and nano indentation method can measure the hardness of a part of the powder, However, the instrument is expensive, the daily maintenance cost is high, and the requirements for the powder material and surface state are also very strict, so it is not suitable for the daily production quality monitoring of ordinary users.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]A method for measuring the hardness of polymethyl methacrylate (PMMA) powder, comprising the following steps: putting PMMA powder (20 microns in particle size) into a porcelain crucible, placing it on an electric heating plate and heating it to the melting point of the powder (130°C), after completely melting, cool to room temperature to form a film, take out the film, and use a Shore hardness tester (D type) to measure its hardness to 82H.

Embodiment 2

[0032] A method for measuring the hardness of polyethylene (PE) powder, comprising the following steps: putting PE powder (particle size 1580 microns) into a porcelain crucible, placing it on an electric heating plate and heating it to the melting point of the powder (112°C) Above, after complete melting, cool to room temperature to form a film, take out the film, and measure its hardness with a Shore hardness tester (D type) to be 43H.

Embodiment 3

[0034] A method for measuring the hardness of boric acid powder, comprising the following steps: putting boric acid powder (300 microns in particle size) into a stainless steel crucible, placing it on an alcohol lamp and heating it to above the melting point of the powder (236°C), completely After melting, cool to room temperature to form a film, take out the film, and measure its hardness with a scratch hardness tester to be grade 2.

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PUM

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Abstract

The invention discloses a method for measuring powder hardness. The method comprises the following steps: putting powder material into a heating container, placing the heating container on a heat source, and heating until reaching the melting point of the powder material; after the powder material is completely melted, cooling to the room temperature to form a thin film; taking out the thin film and measuring the hardness of the thin film by a hardness meter. Compared with the prior art, the method has the advantages of being high in operability, accurate in measurement result and high in reproducibility, and being used for measuring in the general routine laboratory; the method provides reliable reference basis for the precise measurement of the powder. Furthermore, the method provides effective guarantee for development, production and quality control of powder products.

Description

technical field [0001] The invention relates to a method for measuring powder hardness, which belongs to the field of material science. Background technique [0002] The ability of a material to locally resist pressing a hard object into its surface is called hardness. The local resistance of a solid to the intrusion of external objects is an index for comparing the softness and hardness of various materials. Due to the different test methods specified, there are different hardness standards. The mechanical meanings of various hardness standards are different and cannot be directly converted to each other, but they can be compared through experiments. [0003] Hardness is classified as: [0004] (1) Scratch hardness. [0005] It is mainly used to compare the softness and hardness of different minerals. As early as 1822, as early as 1822, Friedrich mohs proposed a method of expressing the hardness of scratches, that is, using 10 kinds of minerals to measure the hardest ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/40G01N1/44
Inventor 孟庆华朱虹李建红李忠程道远
Owner 南京汉旗新材料股份有限公司
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