A research team from North Carolina State University (NC State) has demonstrated a novel laser-based manufacturing technology capable of producing ultra-high-temperature-resistant ceramic materials suitable for applications ranging from nuclear energy technology to aerospace vehicles and jet propulsion systems. This technology can be used to fabricate ceramic coatings, ceramic tiles, and even complex three-dimensional structures, offering Večja prilagodljivost pri oblikovanju visokozmogljivih naprav in inženirskih sistemov nove generacije .
"Sintering is a process that transforms raw materials (powders or liquids) into ceramic materials. In this study, we focused on an ultra-high-temperature ceramic material-HfC. Traditional methods require sintering materials at temperatures of at least 2,200 degrees Celsius using large, high-power furnaces, which not only consume enormous amounts of energy but so omejene tudi s lestvico opreme . Naša metoda je hitrejša, enostavnejša in bolj energetsko učinkovita . "
This new method achieves ceramic sintering by irradiating the surface of a liquid polymer precursor with a 120-watt laser in an inert atmosphere (such as vacuum or argon). The laser first converts the liquid into a solid polymer and then further converts it into ceramic. This process, known as Selective Laser Reaction Pyrolysis (SLRP), predstavlja popolnoma drugačen pristop k tradicionalni izdelavi keramike .
"This is a thermally driven reaction, fundamentally different from traditional methods that rely on photopolymerization. The laser induces localized heating to nearly 2000℃or higher, completing the ceramicization process in just a few seconds. This process not only has low energy consumption but also enables programmable manufacturing, making it suitable for localized patterning or prevleka . "
Za razliko od tehnologije stereolitografije (SLA) se postopek SLRP ne zanaša na suspenzije v prahu ali na UV-napolnjene smole in ne potrebuje korakov naknadne obdelave, kot sta debinzacijo in visokotemperaturno sinter . zaradi tega prelomnega izdelave in obrambnih aplikacij {6 {6} večje odcepitve, ki se lahko zdravi {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {6 {
The research team has successfully used this method to uniformly deposit HfC ceramic on the surface of carbon-carbon composite (C/C) materials. C/C is an advanced material widely used in extreme thermal environments, such as the leading-edge thermal protection structures of hypersonic vehicles. The coating exhibits excellent adhesion and thermal stability, and its thickness can be precisely Nadzorovano s prilagajanjem laserske gostote energije . Ker celotne strukture ni treba sintrano v peči visokotemperature, je ta tehnologija še posebej primerna za materiale, ki so nagnjeni k poškodbam v tradicionalnih procesih .
"Ena ključnih prednosti te tehnologije je njegova modularnost in razširljivost . sistem je mogoče vključiti v obstoječe proizvodne platforme, ki omogočajo digitalno in porazdeljeno proizvodnjo ter odpiranje novih možnosti za prilagojeno oblikovanje in hitro prototipiranje ."
Eksperimentalni rezultati kažejo, da lahko ta metoda neposredno sintetizira fazno napravo HFC keramiko v postopku z enim korakom, pri čemer stopnja keramične pretvorbe presega 50%, kar bistveno presega tradicionalne praške ali fotopolimerizacijske poti .. Absorpcija in reakcijske poti energije .
