Method for measuring real density of double-density bottle powder

Abstract

The invention relates to a method of measuring the real density of the powder using double density bottles, which including the following steps: 1) weighing the quality of the density bottle A and B with the mass of ma and mb accurately, filling the bottle with agent fluid and weighing the quality m1, m2, checking the dielectric fluid density Rho0 corresponding to the temperature, compute the volume of the two bottle va, vb; 2) filling the bottle B with the powder to be measured, weighing the quality m3, and m[sample]=m3-mb; then filling the agent fluid to the surface of the powder 4.8-5.2mm, putting it to the vacuum chamber and pumping to the critical boiling point, keeping 28-32 minutes until the air bubble in the powder space output completely; 3) filling the agent fluid to bottle A,B at the same time, measuring the quality of bottle A m4, bottle B m5; 4) computing the sample's mass density according to the following formula: rho[sample]=m[sample] / v[sample]=(m3-mb)(m4-ma) / [(m4-ma)vb-(m5-m3)va].

Description

technical field [0001] The invention relates to a method for measuring the true density of powder. Background technique [0002] True density is an important indicator of the physical properties of materials. The true density value can be used to identify minerals, and it also has an auxiliary effect on the composition and structure analysis of artificial synthetic materials. [0003] The traditional method of measuring the true density of powder is the pycnometer method, the principle of which is to use the drainage method to measure the true volume V of the powder, and then calculate the true density according to the mass of the powder. The operation steps are briefly introduced as follows: [0004] 1. Accurately weigh the mass m of the pycnometer 0 , fill the pycnometer with mercury (or pure water), put it into a constant temperature box with a prefabricated temperature, and when the liquid column in the capillary drops to the scale, take it out quickly and weigh its m...

AI Technical Summary

Problems solved by technology

[0013] However, in actual operation, the following situation often occurs: it takes a long time for the temperature of the pycnometer to stabilize after it is placed in the thermostat, but the time required for the liquid level in the capillary of the pycnometer to drop to the scale is relatively short. As a result, the temperature of the pycnometer is often not stable when the weighing is taken out, resulting in large deviations in the measurement results

Therefore, the traditional measurement method has many steps in the determination process, takes a long time, and has low operability.