| 摘要 |
<p>1,226,654. Laminates. NORTON RESEARCH CORP. 26 June, 1968 [29 June, 1967], No. 30425/68. Heading B5N. [Also in Division B3] A structural laminate comprises a plurality of layers of rigid reinforcing material alternating with layers of ductile material, each rigid layer being between 0À1 and 1À0 mil. thick, the rigid reinforcing material having an elongation of less than 3 to 4% at tensile failure and comprising at least 10% of the total volume of the laminate, the layers being united together in a coherent mass. The laminates may be made by vacuum metallizing one or both surfaces of a ductile material to form a coherent layer of rigid material and placing an adhesive to form further ductile layers between adjacent layers of rigid material; alternatively, adhesive layers may be placed between adjacent layers of substrate and the rigid material of composites wherein the rigid material is deposited on one surface only of the substrate, etching the substrate away and bonding a further composite to the exposed layer of rigid material, the process being repeated until a laminate of the desired number of layers is formed. In an example, boron films are deposited on aluminium or polyimide substrates, a laminate (Fig. 18) being built up using an epoxy resin adhesive. Boron carbide may be substituted for the boron.</p> |
