Lecture in Materials 2: Bryan McEntire "Silicon nitride - from lab to life"

Описание: Silicon nitride (Si3N4), a man-made marvel, may be young in the grand scheme of minerals, but its story stretches from stardust to the human body. Though not found naturally on Earth, it has been discovered in meteorites, whispering of its primordial birth. First synthesized in 1857, it languished until the 1950s, when its exceptional toughness and heat resistance found a home in fiery furnaces as a refractory material.

Fueled by government research in the 1970s and 1980s, Si3N4 transcended its fiery beginnings. This dense, abrasion-resistant warrior became an industrial champion, conquering challenges in everything from gas turbine engines and wind turbines to dental drills and high-speed cutting tools. Its heat-defying prowess even graced NASA's space shuttle engines and etched memories in spacecraft computers for millennia.

But beneath the roar of industry, a quieter revolution was brewing. In 1986, Si3N4 embarked on a medical odyssey, mending broken spines with its biocompatible magic. Today, it is the trusted architect of spinal fusion implants, mimicking bone with its adaptable density and stimulating new growth. More than just inert, it actively fights infection, naturally repelling bacteria, fungi, and even viruses.

Silicon nitride's potential seems boundless. Its smooth, wear-resistant polish beckons in hip and knee replacements, while its strength whispers promise of permanent dental implants. It even emerged as a hero in the recent pandemic, instantly inactivating COVID-19 variants.

Though a child of human ingenuity, Si3N4 has outmatched most terrestrial minerals. Silicon nitrides remarkable journey, from the fires of industry to the healing touch of medicine, is a testament to the boundless potential of scientific discovery and the enduring quest to improve human lives.