温压成形法制备C-stalk/Cu复合材料的结构与性能

Structure and property of C-stalk/Cu composite material prepared by warm compaction

以棉梗粉末(C-stalk)为基材、电解紫铜粉末为强化因子,添加聚乙烯(PE)作为分散剂,采用温压成形法制备C-stalk/Cu复合材料标准试件和滑动轴承,测定该复合材料的静曲强度、内结合强度、吸水率、表面耐磨性、以及轴承的压溃强度与表观硬度,并观察试件的断口形貌。结果表明:C-stalk/Cu复合材料塑化充分、吸水率低,其静曲强度、内结合强度分别高达92.67 MPa和7.55 MPa,磨耗量仅为优等实木地板漆膜的1/2(<0.05 g/100 r),优于相对密度为80%的6-6-3青铜烧结材料;C-stalk/Cu复合材料制备的滑动轴承,其压溃强度、表观硬度分别高达105.2 MPa和55 HB,可望用来替代烧结青铜生产轻载滑动轴承。

Taking cotton stalk powder as substrate, electrolyte copper powder as intensifier and polyethylene（PE） for dispersant, C-stalk/Cu composite standard specimens and sliding bearings were prepared by warm compaction. Modulus of rupture（MOR）, internal bond strength, water absorption and surface abrasive resistance of composite materials as well as crushing strength and apparent hardness of bearings were measured. Moreover, fracture morphology of specimens was observed. The results showed that C-stalk/Cu composite materials are plasticized abundantly with low water absorption, modulus of rupture and internal bond strength reached 92.67 MPa and 7.55 MPa, respectively. The abrasion loss（〈0.05 g/100 r） only show half value as that of high-class solid wood floor coatings, which performed better than 6-6-3 silicon bronze material with relative density of 80%. The crushing strength and apparent hardness of the sliding bearing produced by C-stalk/Cu composite material can reach 105.2 MPa and 55 HB, respectively. The composites can be used to produce fractional load sliding bearing and replace sintered bronze.