How to Determine Whether the Processing Effect of Vacuum Sintering Furnace Meets the Standard by Detecting the Density and Hardness of Sintered Products?
Release time:
2025-11-26
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Abstract
It is a direct and effective method to determine whether the processing effect of vacuum sintering furnace meets the standard by detecting the density and hardness of sintered products. These two indicators together reflect the degree of sufficient bonding between powder particles during the sintering process and the quality of the final product.
Density is the core evaluation criterion, which directly reflects the ability of the sintering furnace to promote material diffusion and pore shrinkage at high temperatures. The most commonly used method for detecting density is Archimedes' displacement method. By accurately measuring the weight of the sample in air and water, the actual density is calculated, and then compared with the theoretical density of the material to obtain the relative density percentage. If the test results show that the relative density is too low (such as below 95%, the specific standard varies depending on the material), it indicates poor sintering effect. This usually means that the sintering temperature is insufficient, the holding time is not enough, or the temperature uniformity inside the furnace is poor, resulting in excessive residual pores inside the material and insufficient fusion of particles. Failure to meet density standards can directly lead to a decrease in the mechanical properties of the product, such as strength and toughness.
Hardness is an important auxiliary verification indicator, which reflects the ability of sintered bodies to resist local plastic deformation and is strongly correlated with density. Use Rockwell, Vickers, or Brinell hardness testers to perform multi-point measurements at designated locations on the sample to obtain the average value. If the hardness value is significantly lower than the expected standard or fluctuates too much, it also indicates that there is a problem with the sintering process. The reason for low hardness is usually consistent with low density, that is, insufficient sintering and loose material structure. The large fluctuations and poor uniformity of hardness values directly indicate poor thermal field uniformity or uneven atmosphere in the vacuum sintering furnace, resulting in inconsistent sintering shrinkage and tissue densification in different parts of the product.
In summary, a standard vacuum sintering treatment should be able to produce high and uniform density and hardness. In practical judgment, it is necessary to compare the measured data with the material process standards. If both indicators are consistently met, it indicates that the core parameters such as furnace temperature control, vacuum degree, and pressure system are well matched; If any of the indicators are not qualified, the reasons need to be traced from both the sintering process curve and the furnace performance (such as heating elements, insulation screens, vacuum systems).
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Zhuzhou Chi Carbon Automation Equipment Co., Ltd
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