| 摘要 |
A brake shoe lining composition consists of (1) 30-80% by weight graphite (60-500 mesh) and/or carbon black, (2) up to 40% granules of a metal softer than cast iron (10-100 mesh), and (3) 20-50% solid comminuted phenol-and/or melamine-formaldehyde resin; the carbon forming the largest constituent by weight. Preferred metal granules are copper, aluminium or lead. In the example, a brake shoe lining was moulded at 170 DEG C. and 150 kg./cm.2, followed by baking for four hours at 80 DEG C., from a mixture of 50% graphite, 10% copper, 15% aluminium and 25% phenol-formaldehyde resin (80-200 mesh). Comparative data are given from tests on the brake shoe linings and on conventional linings. |
