Segregation of components in freeze dry processing for ceramics raw powder.

Freeze granulation: Powder processing for transparent alumina applications

se of freeze granulated powders is successfully used as an industrially viable alternative to loose powder sintering for transparent polycrystalline lumina (PCA). Freeze granulation with narrow granule size distribution was realized after suspension condition optimization, with very good owability and regular spherical shapes. The key factors are low viscosity slurries linked to the complex int...

Particulate Interactions in Dry Powder Formulations for Inhalation Particulate Interactions in Dry Powder Formulations for Inhalation

Wet-chemistry processing of powdery raw material for high-tech ceramics

The purpose of this study was to develop wet-chemistry approaches for the synthesis of ultradispersed and mesoporous metal oxide powders and powdery composites intended for usage in the production of ceramic materials with desired properties. The focus is on the development of template synthesis of mesoporous metal silicates as well as obtaining nano- and subnanopowders by a modified sol-gel te...

Yield stress modelling of doped alumina suspensions for applications in freeze granulation: towards dry pressed transparent ceramics

Rheology of powder suspensions is a key factor in many processing routes, and better understanding of the parameters that control the rheology improves technical progress by reducing the empirical factors in the formulation of powder slurries. The strict requirements for the production of transparent polycrystalline alumina demand a fundamental understanding of powder handling and processing st...

Formoterol dry powder in asthma.

We read with interest the paper by Douglas and coworkers (July 1993;48,719-21) on the possible inheritance of sleep disturbed breathing. Investigating 40 first degree relatives of patients with sleep apnoeas, they found a high prevalence of sleep apnoeas/ hypopnoeas (25%), several times higher than the prevalence in a random sample of the British population (5%).' The authors concluded that a f...