## 3 Results and Discussion
### Basic Glass Differential Thermal Analysis
The degree of crystallization of the microcrystalline glass within the range of 900-950 \({}^{\circ}\)C increased with increases in temperature. The determination of parameters such as the strength, coefficient of thermal expansion, and optical and dielectric properties of microcrystalline glass is costly and time-consuming,  
Figure 4: SEM images of microcrystalline glass samples at different crystallization temperatures: (**a**) 900 \({}^{\circ}\)C, (**b**) 925 \({}^{\circ}\)C, and (**c**) 950 \({}^{\circ}\)C.  
Figure 3: XRD patterns of microcrystalline glass products obtained at different crystallization temperatures. while the measurement of density is relatively simple and low-cost. Therefore, the evaluation of material density can be used to analyze the phase changes in microcrystalline glass to indirectly examine its properties and to realize the control of glass composition and the microcrystallization process. Density testing is commonly used in practical production as one of the means of glass quality inspection. Figure 5 illustrates the results of the effects of crystallization temperature on the density of the microcrystalline glass. As illustrated in Figure 5, the density of the prepared microcrystalline glass gradually increased with the increase in crystallization temperature, thereby reaching a maximum density of 2.72 g/cm\({}^{3}\) at 950 \({}^{\circ}\)C. The increase in temperature promoted the precrystallization of the base glass and increased the number of crystals, improved the crystallization degree, increased the density of the crystal structure, and increased the density of the microcrystalline glass. Water absorption is a physical quantity that indicates the degree of water absorption of an object. A low water absorption rate could inhibit the adsorption of a leaching solution into the interior of a curing body, thus inhibiting the leaching of heavy metals. Therefore, reducing the water absorption rate of microcrystalline glass is important for product quality improvement. Figure 6 illustrates the results of the effect of crystallization temperature on the water absorption of the studied microcrystalline glass. The trend of the water absorption of the microcrystalline glass with the increase in the crystallization temperature and the trend of density with the increase in the temperature were opposite. This may be attributed to the increase in the number of crystalline phases precipitated from the microcrystalline glass with increasing temperature. Moreover, the crystalline grains primarily had spherical and columnar shapes; therefore, the number of pores between the crystals gradually decreased and the densities of the crystals increased. As displayed in Figure 4, with the increase in the crystallization temperature, the number of crystalline phases gradually increased, the densities of the crystalline phases increased, and the water absorption rate of the microcrystalline glass decreased. Figure 5: Effects of crystallization temperature on the density of the microcrystalline glass. Figure 6: Effects of crystallization temperature on the water absorption of the microcrystalline glass. Porosity refers to the percentage of the volume of pores contained in a refractory product compared with the total volume of the product. It is used to identify the degree of sintering of products such as ceramics and refractory materials, to determine the adsorption capacity of porous substances such as activated carbon, and to measure the technical properties of foams, among others. Th excessive porosity of microcrystalline glass could lead to an uneven surface and thus affect the strength of the product. Figure 7 illustrates the results of the effects of crystallization temperature on the porosity of the studied microcrystalline glass. When the crystallization temperature was 900 \({}^{\circ}\)C, the number of crystalline phases in the microcrystalline glass was small because the lower crystallization temperature hindered the precipitation process and the growth of the precipitated grains was incomplete.