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美国诺顿公司(Norton Co.)推出一种氮化硅轴承材料“Noralide”,用以制成轴承,其成本仅为NC-132材料轴承的1/10;与钢制轴承相比,成本相等或稍稍高一些。由于毛坯的几何形状接近于成品,从而降低了用金刚石精加工的费用。
Norton Co. of the United States introduced a “Noralide” silicon nitride bearing material to make bearings at a cost of 1/10 of the NC-132 material bearing; the cost is equal to that of steel bearings or Slightly higher. As the rough geometry close to the finished product, thereby reducing the cost of diamond finishing.