供应石墨轴承

      石墨是用焦碳粉和石墨粉或加碳黑做基料，用沥青为粘结剂，经模压成型在高温下烧制而成的。一般将烧结石分为二种。一种为碳素石墨，以称碳石墨，其特点是质硬、脆；另一种为石墨化石墨，以称电化石墨，其特点是质软、强度低，自润滑性能好。

      石墨具有优良的耐腐蚀性能。其化学稳定性能很高，在空气中400℃以下稳定，除强氧化性介质如王水、铬酸、浓**及卤素外，可耐其它酸、碱、盐类及一切有机化合物的腐蚀。石墨的耐腐蚀程度一般随基料的种类和浸渍剂的不同而异。

      石墨是机械密封摩擦付材料中用量**大，使用范围**的一种材料。它具有优良的耐腐蚀性能，除了强氧化性介质外，可以耐各种浓度的酸、碱、盐类及一切有机化合物的腐蚀。同特别好的自润滑性和低的摩擦系数，与钢对磨时，摩擦系数为0.04-0.05，经浸渍处理的碳石墨在流体动力润滑条件下，其摩擦系数在0.08-0.1范围内。石墨具有很高的导热系数(100～110千卡/米·时·度)，较低的线膨胀系数(2～3×10-6℃)以及良好的耐温急变性能和加工性能，可以进行各种机械加工。

      Graphite is the widest and most quantity materials used in the machine seal parts. It has a good erode-resistant ability. It can stand against cauterization from acid, alkali, salt and all organic compound except strong oxidation material.

      Because of it's special ideal lubricative ability, the rub coefficient is between with 0.04 and 0.05 when it is rubbed with steel. With dipping treatment, under the situation of hydrokinetics, the rub coefficient is between with 0.08 and 0.10.

      Graphite has a high heat-transmiting coeficient(100～110kilo-calorie/metre hour degree), and a lower line expanding coefficient(2～3×10-6℃), favorable anti-temperature deformationand machining ability. It can be processed by several kings of mechanical means.