초록 ▼

Insulating material, of compacted structure and of low thermal conductivity, is formed of silica-based primary particles; it is obtained by heat treatment of a compound of silane, of which the mean diameter is at most equal to 100 A; the apparent density r-3 and 2.3.10-3d, d being the mean diameter

Insulating material, of compacted structure and of low thermal conductivity, is formed of silica-based primary particles; it is obtained by heat treatment of a compound of silane, of which the mean diameter is at most equal to 100 A; the apparent density r-3 and 2.3.10-3d, d being the mean diameter of the primary particles expressed in A; in addition, this apparent density is at most equal to two thirds of the density of the solid material. This material is applicable as a thermal insulator in the field involving low temperatures and high temperatures and in the building sector.

대표청구항 ▼

Insulating material having low thermal conductivity, formed of a compacted granular structure of silica-based primary particles, wherein the silica powder is obtained by heat treatment or pyrogenation of a silane compound; the mean diameter of the primary particles being at most equal to 100 A; said

Insulating material having low thermal conductivity, formed of a compacted granular structure of silica-based primary particles, wherein the silica powder is obtained by heat treatment or pyrogenation of a silane compound; the mean diameter of the primary particles being at most equal to 100 A; said silica-based, ultra-fine primary particles having been compacted mechanically to provide an apparent density of the compacted structure, expressed in g/cc, being 6×10-3 d and 2.3×10-3 d wherein d is the mean diameter of the primary particles expressed in A; said apparent density being at most equal to two thirds of the density of the solid material; and said granular compacted structure containing at least 0.8×1016×(500/d)2 primary particles per cubic centimeter.