Smartphones that don’t scratch or shatter. Metal-free pacemakers. Electronics for space and other harsh environments. These could all be made possible thanks to a new ceramic welding technology developed by a team of engineers led by the University of California San Diego.
The process, published in the Aug. 23 issue of Science, uses an ultrafast pulsed laser to melt ceramic materials along the interface and fuse them together. It works in ambient conditions and uses less than 50 watts of laser power, making it more practical than current ceramic welding methods that require heating the parts in a furnace.
Ceramics have been fundamentally challenging to weld together because they need extremely high temperatures to melt, exposing them to extreme temperature gradients that cause cracking, explained senior author Javier E. Garay, a professor of mechanical engineering and materials science and engineering at UC San Diego, who led the work in collaboration with UC Riverside professor and chair of mechanical engineering Guillermo Aguilar.
Ceramic materials are of great interest because they are biocompatible, extremely hard and shatter resistant, making them ideal for biomedical implants and protective casings for electronics. However, current ceramic welding procedures are not conducive to making such devices.
“Right now there is no way to encase or seal electronic components inside ceramics because you would have to put the entire assembly in a furnace, which would end up burning the electronics,” Garay said.
Garay, Aguilar and colleagues’ solution was to aim a series of short laser pulses along the interface between two ceramic parts so that heat builds up only at the interface and causes localized melting. They call their method ultrafast pulsed laser welding.
To make it work, the researchers had to optimize two aspects: the laser parameters (exposure time, number of laser pulses, and duration of pulses) and the transparency of the ceramic material. With the right combination, the laser energy couples strongly to the ceramic, allowing welds to be made using low laser power (less than 50 watts) at room temperature.
“The sweet spot of ultrafast pulses was two picoseconds at the high repetition rate of one megahertz, along with a moderate total number of pulses. This maximized the melt diameter, minimized material ablation, and timed cooling just right for the best weld possible,” Aguilar said.
“By focusing the energy right where we want it, we avoid setting up temperature gradients throughout the ceramic, so we can encase temperature-sensitive materials without damaging them,” Garay said.
As a proof of concept, the researchers welded a transparent cylindrical cap to the inside of a ceramic tube. Tests showed that the welds are strong enough to hold vacuum.
“The vacuum tests we used on our welds are the same tests that are used in industry to validate seals on electronic and optoelectronic devices,” said first author Elias Penilla, who worked on the project as a postdoctoral researcher in Garay’s research group at UC San Diego.
The process has so far only been used to weld small ceramic parts that are less than two centimeters in size. Future plans will involve optimizing the method for larger scales, as well as for different types of materials and geometries.
The Latest on: Ceramic welding
[google_news title=”” keyword=”ceramic welding” num_posts=”10″ blurb_length=”0″ show_thumb=”left”]
via Google News
The Latest on: Ceramic welding
- 2001 Aluma-Weld/Xpress Values, Specs and Priceson September 30, 2023 at 10:32 am
Building their first boat in 1966, Arkansas-based Aluma-Weld/Xpress boats offers a wide range of fishing and hunting watercraft. Signature features presented on all Aluma-Weld/Xpress boats includes ...
- Explosion Welding Goes Off With A Bangon September 29, 2023 at 5:00 pm
Welding is often a hot and noisy process. It generally involves some fancy chemistry and proper knowledge to achieve good results. Whether you’re talking about arc, TIG, or MIG, these statements ...
- Casting Cylinder Heads Out Of JB Weldon September 28, 2023 at 5:00 pm
Like friendship, JB Weld is magic. Rumors persist of shade tree mechanics in the Yukon repairing cracked engine blocks with JB Weld, and last month this theory was proved correct. [Project Farm ...
- Weld County oil spills for Sept. 26on September 26, 2023 at 4:01 pm
NOBLE ENERGY INC reported Sept. 21 a historical tank battery spill near Weld County Road 47 and 42, about 9 miles east of Gilcrest. An unknown amount of oil, condensate and produced water spilled. Lab ...
- The 13 Best Online Jewelry Stores of 2023 for Every Price Pointon September 26, 2023 at 10:45 am
You don’t have to shop in-store at a jeweler to find the best accessories. From fine jewelry to costume pieces, here are the best online jewelry stores that offer great inventory as well as feature an ...
- Humane Society of Weld County will have new name, logo for opening under Larimer Humane Societyon September 26, 2023 at 6:58 am
A lot has changed at the Humane Society of Weld County in the last four months, but visibly little has changed to the public eye at the nonprofit in Evans. That won’t be the case for long. When the ...
- Resistance and Laser Welding for Medical Deviceson September 24, 2023 at 5:00 pm
Medical devices use a variety of metal components that are often welded to form a secure and permanent bond. Options available for welding processes are limited because of certain constraints such as ...
- Colorado Newson September 21, 2023 at 11:12 am
The Weld County Sheriff’s Office recently mandated that anybody seeking public records from the agency must get a form notarized in order to obtain documents — a move a free speech expert ...
- Desktop Metal Announces Sale of Production System P-50 and Super Fleet of Metal Binder Jet Systems to FreeFORM Technologieson September 11, 2023 at 1:05 pm
Desktop Metal, Inc. (NYSE: DM), a global leader in additive manufacturing technologies for mass production, today announced the sale of a Production S ...
- Welding School Can Lead to a Well-Paid Careeron June 9, 2023 at 1:48 pm
Young people seeking a line of work with a living wage and job opportunities across the country should consider welding, a field that professionals say is both a science and an art. Welders ...
via Bing News