Laboratory work №13 Theme lessons: Research influence of sintering temperature and time on basic properties of the foam glass

The purpose of lessons: revealing the influence of sintering temperature and time on the basic properties of the foam glass

Equipment, tools and technical means: muffle furnace; Scilla instrument for studying the kinetics of swelling of foam glass; a set of refractory crucibles; scale engineering; Press the SGP; calipers; Ball Mill; PSC-K; ALS-5; shaker.

The order of performance of works in the audience:

1. Undergraduates studying the effect of sintering temperature on the basic properties of the foam glass

2. Undergraduates studying the effect of the duration of sintering on the basic properties of the foam glass

Working process

To conduct the study, each team uses their results obtained in carrying out laboratory work №11 and №12. Selecting optimum values for the amount of blowing agent and grind batch, 24 samples produces swelling (two sample values for each sintering temperature and two sample values for each sintering duration). The initial data for this series of experiments is taken from Table 1.

Table 1 – Baseline

№	View gasifier	Sintering mode
		Time, min	Temperature, 0С
			1	2	3	4
1	pyrolusite	10 20 30	680	700	620	740
2	sodium nitrate	10 20 30	680	700	720	740
3	Limestone, marble, chalk	10 20 30	750	775	800	825
4	Coke	10 20 30	790	820	850	870
5	Anthracite	10 20 30	760	770	780	790

Each panel represents the results of studies in graphs according to the average density and the strength of the temperature and duration of sintering batch.

On the properties of foamed glass is strongly influenced by the temperature and duration of annealing. Maximum foam glass annealing temperature must correspond to the temperature at which glass viscosity is about 1012 N-s / m². This viscosity is achieved for a conventional glass at a temperature of about 600 ° C.

Given the need to equalize the temperature throughout the thickness of the product to foam glass thermal stress relief annealing at a temperature of 600 ° C is maintained for a certain time.

In order to determine the effect of the duration of annealing on the properties of foamed glass, each team produces nine replicates. Three samples removed from the oven immediately after the swelling process, which is carried out on the optimal regime established in the performance of work 1; Three samples were annealed at 600 ° C for 15 minutes and the last three sample - at the same temperature for 30 minutes. The cooled samples were removed from the oven and tested by determining an average density and compressive strength, and their properties are compared by plotting plots of "annealing duration - average density - Compressive strength".