【作者】 陆荣；

【导师】 魏无际；

【作者基本信息】 南京工业大学 ， 材料学， 2005， 硕士

【摘要】 本课题组已经用超细级三氧化二铝（Al₂O₃）粉体（粒径≤1μm）填充不饱和聚酯树脂（UPR），以悬浮聚合的方法制备出一种用于精细微加工中水“砂”混合喷射的复合微粒磨料。这种喷射磨料的产率达到了60％左右（目标粒径范围在140μm～250μm之间），本文希望在保持高产率的基础上，进一步提高复合微粒的性能，期望得到的目标产物硬度大、密度高并且强度好。 首先，要提高Al₂O₃粉体的利用率，使它易于与有机相结合，减少其在水相中的损失，就必须对其进行表面改性。本文主要采用硅烷偶联剂改性Al₂O₃粉体，考察并比较了KH-570和KH-560改性Al₂O₃粉体的方法、工艺以及效果。 结果表明，采用湿法处理工艺效果较好，通过亲油化度的测定得到了合理的改性参数，对比发现KH-570的改性效果要优于KH-560，因此本文选取KH-570作为表面改性剂，改性参数为：KH-570用量6％、温度90℃及时间3.5hr。 其次，建立悬浮聚合UPR／Al₂O₃复合微粒物理及力学性能的测试方法：通过灼烧实验、密度测试和微观分析，考察影响UPR／Al₂O₃复合微粒各物理性能的因素；从复合材料基体的基本力学性能出发，着重研究UPR／Al₂O₃复合微粒硬度测试的制样方法、系统误差、测试范围及可行性。 结果表明，在相同的Al₂O₃添加量下，改性后的Al₂O₃与UPR复合出的微粒（1^#）与未改性的Al₂O₃与UPR复合出的微粒（2^#）相比较：前者密度大并且Al₂O₃粉体的实际含量多。造成这种差别的主要原因是：Al₂O₃的表面改性效果好，减少了其在悬浮聚合过程中于水相中的损失、使其在基体中的分散效果得到提高。 针对用显微维氏硬度计测试UPR／Al₂O₃复合微粒的硬度所探索的特殊制样新方法是可行的；对复合材料基体的压缩力学行为分析表明，硬度测试的系统误差≤20.8％，测试范围：被测试材料的硬度需≥11.3HV：对不同Al₂O₃添加量的UPR／Al₂O₃复合微粒和复合材料浇铸体试样随机抽取10个硬度值统计分析表明，方差小，平行试样的相对误差远小于GB5030-85中规定的相对误差＜7.0％的要求。 最后，用以上显微硬度测试法，测试并比较了1^#和2^#复合微粒的硬度，通更多还原

【Abstract】 This paper has obtained a kind of composite particle jet abrasive which was composed of Al₂O₃ （d-≤1μm） and unsaturated polyester resin （UPR）. The productscan be produced by suspension polymerization and used with water in micro-processing. The productivity of this composite particles have achieved to 60%（the composite particles must have suitable diameter 140²50μm）. This paper considers getting the composite particles that have more higher hardness, density and strength on the base of keeping on the high-yield.Firstly, in order to improve the availability of Al₂O₃, make Al₂O₃ connected with polymer easily and decrease the expense in water we should modify Al₂O₃ by surfactant. Then compare the method, processing technology and effect of surface modified Al₂O₃ by using KH-570 or KH-560.The results indicate that the effect of wet surface modified is better. Properties of Al₂O₃ powders modified by KH-570 are sharply better than that of KH-560. Therefore, we have chosen KH-570 as the surfactant. Modify parameter: KH-570 6%（wt）, temperature 90℃ and time 3.5 hours.Secondly, cauterizing method tests the physical and mechanical properties of UPR/Al₂O₃ composite particles synthesized through suspension polymerization. The Various factors, which affect the physical property of UPR/Al₂O₃ composite particle are researched .On the base of discussing mechanics property of UPR/Al₂O₃ composite materials, we emphasize the way of making samples, systemic error, testing range and feasibility.The results indicate that: through comparing UPR/Al₂O₃ composite particles when they are regenerated or not, we know that when they have the same accretion content of Al₂O₃, the density of the former （1^#） was larger than that of the latter （2^#） and the former contained more Al₂O₃. The main factor of the difference are the loss of Al₂O₃ which is reduced in the water state of suspension polymerization, effect of surface modified and scattered state in UPR are improved.更多还原