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Rapid Pressureless Sintering of Glasses.

Zhiwei Lin¹, Xinpeng Zhao¹, Chengwei Wang¹

¹Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, USA.

Small (Weinheim an Der Bergstrasse, Germany)

|March 31, 2022

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A new ultrafast high-temperature sintering (UHS) method rapidly produces high-quality silica glass in seconds, significantly faster than traditional techniques. This process enables efficient fabrication of various transparent materials, including doped glasses and ceramics.

Area of Science:

Materials Science
Glass Science
Ceramics Engineering

Background:

Silica glass possesses valuable properties like high transparency and hardness, crucial for industrial applications.
Conventional fabrication methods are slow and costly due to long thermal treatment times and complex setups.
There is a need for rapid and facile techniques to produce high-quality silica glass.

Purpose of the Study:

To introduce and demonstrate an ultrafast high-temperature sintering (UHS) technique for rapid glass fabrication.
To investigate the feasibility of UHS for producing high-density, high-transparency silica glass.
To explore the potential of UHS for fabricating doped glasses and transparent ceramics.

Main Methods:

Developed an ultrafast high-temperature sintering (UHS) technique using closely placed carbon heaters for rapid densification.

Keywords:

functional glass powder sintering transparent materials ultrafast high-temperature sintering

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Achieved high heating rates (up to 10^2 K s^-1) enabling sintering in approximately 10 seconds.

Applied UHS to silica precursors, doped silica glass (e.g., ITO-doped), and transparent ceramics (e.g., Gd-doped YAG).

Main Results:

Sintered silica glasses achieved relative densities greater than 98% and visible transmittances around 90%.
The UHS method is 1-3 orders of magnitude faster than existing fabrication techniques.
Successfully fabricated doped silica glasses and transparent ceramics, demonstrating the versatility of UHS.

Conclusions:

Ultrafast high-temperature sintering (UHS) offers a rapid, pressure-free method for fabricating high-quality silica glass.
UHS significantly reduces fabrication time and cost, opening new possibilities for materials discovery.
This technique is a promising proof-of-concept for the accelerated production of various transparent materials.