Sintering agents

Fig. 12. Scanning electron micrographs (6000 x) of residues of air-pyrolyses of halogen-free ethylene-vinyl acetate, containing Zinc Borate (33%) and alumina trihydrate (ATH) (33%). At 500°C (top picture), a powdery residue was obtained no sintering took place between the Zinc Borate (small particles) and ATH (large particles). At 550°C (bottom picture), a hard and porous residue was obtained Zinc Borate acted as a sintering agent. A hard and porous residue is a good thermal barrier.

Sample Flaky crust Dense crust underneath the flaky crust From points straddled between a crust and y-grain surface and from points straddled between sintering agents and a grain surface From points in y-grain phase but not deeper than 10 fan... 

Chem. Descrip. LDPE CAS 9002-88-4 EINECS/ELINCS 200-815-3 Uses Additive for FRP composites binder for loose particles/fibers sintering agent in ceramics, powd. metallurgy cosmetic filler for soaps/... 

Boron nitride powder is produced directly from the elements or from the reaction of boron and ammonia or boric oxide and ammonia. The powder is difficult to process and expensive and requires a sintering agent such as boric oxide. 

Pure AIN powders are sintered with sintering agents, typically oxides of yttrium or calcium. These additions degrade the thermal conductivity. In addition, moisture and many chemicals attack pure AIN substrates. As protection against these elements, and to promote adhesion to thick-fihn inks, a thin oxide layer is usually grown on the surface. Consequently, the thermal conductivity of AIN can vary widely from its maximum value, reported to be 320 W/(m and is typically in the range of 170 to 200 W/(m K). B. B. Poole of... 

The stabilization of Ca " " and F ions into the Ce-based oxides adopting a fluorite-type structure with nanosized particles can then be explained. In many cases, alkaUne or alkaline earth as well as fluorine are excellent sintering agents, which contribute to the particle growth. In the Cei xCax02 x and Cei /Ca/02-x y/2 y series, the particle size does not increase and remains around 10 nm. The electronegativity, formal charge and ionic radius are quite different for Ce " and Ca + ions as those of and F anions. Ca ... 

---