High-strength high-expansion sodium-aluminum-silicon glass-ceramics and preparation method thereof

Abstract

The application provides a high-strength high-expansion sodium-aluminum-silicon glass-ceramics and a preparation method thereof, and belongs to the field of electronic ceramic materials. The material composition is as follows: Na2O is 12-15wt%, CaO is 13-16wt%, Al2O3 is 10-16wt%, SiO2 is 55-58wt%, and MgO is 1-4wt%. The high-strength high-expansion sodium-aluminum-silicon glass-ceramics provided by the application has main crystal phase of sodium dravite NaAlSiO4, and secondary crystal phase of wollastonite CaSiO3 and diopside CaMgSi2O6. The material has bending strength of 132-227MPa, Young's modulus of 66-86GPa, thermal expansion coefficient of 10.96-11.28ppm / ℃, dielectric constant of 5.89-6.54, and dielectric loss of 2.85-4.32*10 ‑3 In addition, the preparation method provided by the application has the advantages of low cost and simple process, is beneficial to industrialized production, and has potential application value for electronic packaging substrates.

Description

Technical Field

[0001] This invention belongs to the field of electronic ceramic materials, specifically relating to a high-strength, high-expansion sodium aluminum silicon microcrystalline glass and its preparation method; it can be applied to electronic packaging substrates. Background Technology

[0002] Sodium aluminum silicon glass has potential applications in dentistry, light emission, and displays. For example, invention patent CN121850377A prepares sodium aluminum silicon glass using the sol-gel method, with a sol composition of 12-15 parts aluminum silicate, 7-9 parts NaOH, 60-70 parts water, 1.0-5.8 parts nano-vaporized SiO2, and 1.0-1.3 parts TiO2. However, the resulting glass has a low flexural strength of only 70-76 MPa and a high dielectric loss of approximately 0.01, failing to meet the requirements for mechanical strength and dielectric properties of electronic packaging substrate materials. Therefore, this invention provides a high-strength, high-expansion sodium aluminum silicon glass and its preparation method. Summary of the Invention

[0003] This invention provides a high-strength, high-expansion sodium aluminum silicon microcrystalline glass and its preparation method, the technical solution of which is as follows: The formula consists of 12-15 wt% Na2O, 13-16 wt% CaO, 10-16 wt% Al2O3, 55-58 wt% SiO2, and 1-4 wt% MgO.

[0004] Furthermore, the preparation method of the above-mentioned high-strength, high-expansion sodium aluminum silicon microcrystalline glass includes the following steps: Step 1. Calculate and weigh the actual amount of each raw material based on the mass fraction of Na2O, CaO, Al2O3, SiO2, and MgO in the formula; Step 2. After drying the slurry obtained from ball milling, pour it into a crucible and place it in a muffle furnace to heat to 1500℃ and melt for 1 hour; Step 3. Pour the molten glass into deionized water for water quenching to obtain glass slag. Grind the glass slag to obtain glass powder. Step 4. Grind glass powder, zirconium balls, and deionized water in a ball mill jar for 2 hours in a certain proportion. After drying and sieving, the resulting slurry is a powder with uniform particle size. Step 5. After granulation, the material is dry-pressed and placed in a sintering furnace. After holding at 900℃ for 2 hours, it is naturally cooled to obtain high-strength, high-expansion sodium aluminum silicon microcrystalline glass.

[0005] Furthermore, the beneficial effects of the present invention are as follows: This invention provides a high-strength, high-expansion sodium aluminum silicon microcrystalline glass, with the main crystalline phase being sodium nepheline (NaAlSiO4) and the secondary crystalline phases being wollastonite (CaSiO3) and diopside (CaMgSi2O6). By adjusting the composition ratio, the bending strength is increased to 227 MPa, the Young's modulus to 86 GPa, and the coefficient of thermal expansion to 11.28 ppm / ℃. This can solve the thermal mismatch problem between the substrate and the PCB and improve the reliability of electronic packaging.

[0006] Furthermore, the present invention provides a high-strength, high-expansion sodium aluminum silicon microcrystalline glass with a dielectric constant of 5.89~6.54 and a dielectric loss of 2.85~4.32×10⁻⁶. -3 This can improve signal transmission speed and reduce losses; Furthermore, the high-strength, high-expansion sodium aluminum silicon microcrystalline glass provided by this invention has low manufacturing cost and simple process, which is conducive to industrial production and has potential application value for electronic packaging substrates. Attached Figure Description

[0007] Figure 1 The image shows the XRD pattern of a high-strength, high-expansion sodium aluminum silicon microcrystalline glass of Example 4.

Claims

1. A high-strength, high-expansion sodium aluminum silicon microcrystalline glass, characterized in that, It includes the following composition: Na2O 12~15wt%, CaO 13~16wt%, Al2O3 10~16wt%, SiO2 55~58wt%, and MgO 1~4wt%.

2. The high-strength, high-expansion sodium aluminum silicon microcrystalline glass according to claim 1, characterized in that, The main crystalline phase is nepheline (NaAlSiO4), and the secondary crystalline phases are wollastonite (CaSiO3) and diopside (CaMgSi2O6).

3. The high-strength, high-expansion sodium aluminum silicon microcrystalline glass according to claim 1, characterized in that, Flexural strength 132~227MPa, Young's modulus 66~86GPa, coefficient of thermal expansion 10.96~11.28ppm / ℃, dielectric constant 5.89~6.54, dielectric loss 2.85~4.32×10 -3 .

4. The method for preparing high-strength, high-expansion sodium aluminum silicon microcrystalline glass according to claim 1, characterized in that, Includes the following steps: Step 1. Calculate and weigh the actual amount of each raw material based on the mass fraction of Na2O, CaO, Al2O3, SiO2, and MgO in the formula; Step 2. After drying the slurry obtained from ball milling, pour it into a crucible and place it in a muffle furnace to heat to 1500℃ and melt for 1 hour; Step 3. Pour the molten glass into deionized water for water quenching to obtain glass slag. Grind the glass slag to obtain glass powder. Step 4. Grind glass powder, zirconium balls, and deionized water in a ball mill jar for 2 hours in a certain proportion. After drying and sieving, the resulting slurry is a powder with uniform particle size. Step 5. After granulation, the material is dry-pressed and placed in a sintering furnace. After holding at 900℃ for 2 hours, it is naturally cooled to obtain high-strength, high-expansion sodium aluminum silicon microcrystalline glass.

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