• Kerr-lens mode-locking of hot-isostatic-pressed Cr:ZnSe polycrystal. Four optical cycles pulse generation at 2.4 μ m. Laser comparison between untreated and HIP-treated polycrystals. We report on a room temperature mode-locked chromium-doped zinc selenide (Cr:ZnSe) laser emitting four optical-cycles pulses in the mid-infrared spectral region which polycrystal has been treated by hot isostatic...

In this thesis, we report on a process to obtain yttrium oxide nanosized particles doped with ytterbium and a sintering method that leads to transparent polycrystalline ceramics. First, nano-powder of yttria was fabricated from a precursor with transient morphology, i.d. yttrium hydroxynitrate platelets that decompose into spherical yttria nano-particles during calcination. The influence of dif...

Transparent ytterbium-doped yttria ceramics, 2 at.% Yb:Y2O3, were fabricated by hot uniaxial pressing in vacuum at 1550 °C/50 MPa followed a two-stage Hot Isostatic Pressing (HIPing) 1200–1400 °C/100 MPa, using nanopowders obtained self-propagating high-temperature synthesis (with lithium fluoride serving as sintering aid). The addition of LiF during the powder markedly changed morphology powde...

The effect of hot isostatic pressing (HIP) on the stress rupture property K417G nickel-based superalloy is studied experimentally. results show that alloy improved by appropriate HIP process. After HIP, average microporosity after 0.04%, which reduced nearly 90% compared with as-cast microstructure. cubic γ′ precipitates grow up, accompanied precipitation fine phase in matrix. In addition, area...