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ID:33354630
大小:2.05 MB
页数:64页
时间:2019-02-25
《原位合成allt2gtolt3gtpalsi复合材料的研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、江苏太擘顽士学位论文搐簧本文利用原位铸造法成功地制备了A1203p/A1复合材料。利用金相鼹微镜、担爨激缱、X-射线麓射纹警多秭现霞分耨手段,礤究了A1203p/A1复合孝葶瓣熬形成燕力学、动力学,并对该复合材料的界面徽结构遴行了分孝斥,测试了虢拉强度和摩擦磨损性能。蜜验结果表隧:叛si02粉剃为原材料,于800-900"C锅熔体中反瘦,叟嶷增强蹶靛8-Ah03,该颗粒较均匀她分毒疰基搭中,磐决了蒸体与增强钵之阔的润溺随繇。同时,x_鸯于线衍射分橱袭明:镑犟蕊入法反应没裔电磁搅拌法完全。对Si02和Al之间的化学反应进行热力学和动力学分析,认为两者之闼豹
2、发瘦可爱“逐漂爱瘟’j嚣蕊l翮扩散瓠翻采攒述。电磁搅拌法、钟罩鼷入涪、预制块法等三种方法被脂于制备藤位合成A1203p/A1复合材料。电磁搅拌法制备的复龠材辩箕有眈钟罩鹾入法、灏制块法裁备豹复合兹料受磐懿掇壤力学缝戆。镄摹逐入法秘蓉兹笈食耪辩,其联生或豹A1203颗粒大小在4-6[zrn,数量较少,抗拉强廉在89.1田8,2MPa之间,甄{率率均小于5%;电磁搅拌法制豁的复合材料,其所生成的颗粒在1-4pm,数嫩较多,菝控强凌在鸵,l~126,2MPa之耀,延{孛牵驭2.38%~lg。9%;预裁袭法肇g备戆复合材料颗粒团聚比较严重,灏抗拉强度在72.8~
3、76.3MPa之问,延伸率从O.22%一2,18%。出上可知,生成趟203增强颗粒的多少、大小与分布情况对复合精籍鹣裰棱柱麓影臻较大。随着SiO:添加艟的增加,电磁搅拌法制番的复合材料磨损率有近似线性下降的趋势。在轻载下,A1203/A1复合材料的磨攒以微切拷9为主;在重载下,粘若磨簇霸薅瓣瘩接共存,毽淤窦瓣蘩缓为主,穗羲密按夔载蘩增大瑟减弱。关键诱;蒙筏铸造法,Si锄鬏粒,锯鏊笈含耱鼗,熬力学,动力攀,摩擦艚损汪雾大学硕士学醢谗文A塾S零RAC繁Inthispaper,A'1203p/A1compositeshavebeentriumptmntlyfa
4、bricatedbyin-situcastingmethod.Thermodynamicsandkineticsof翻chemicalreactions耗fabricatethecompositeshavebeenanalyzed,whiletheinterfacialmicrostructure,thewearcharacteristics,andthetensilestrengthofthecompositeshavebeenstudiedbyusingopticalmicroscope国M)'scanningelectronmicroscope(S
5、EM),X-raydiffractometer(XRD)andotherequipments.Itisshownthatthereinforcingphasesofin·situcompositessynthesizedbythereactionbetweenSi02andmoltenahtminum(900一9004C)arefound船be5-A1203and交eyarewelt·distributedinaluminumalloymatrix.ItiSalsofound啦atthewettabititybetweenthematrixandrein
6、forcementshasbeenimproved,IthasbeenconfirmedbyXRDanalysisthatthechemicalreactionsinthebetl—fillingprocessareriot勰completed嚣thatinelectromagnetic囊囊端process。Accordingtothermodynamicandkineticanalysis,itisproposedthatthereaction-diffusionmechanismofSi02andA1canbedescribedby“layerbyl
7、ayerreactionmec,hanism'’anddiff-asionmechanism,Theelectromagneticstirring,bell-filling,andpre-formingprocesseshavebeenemployedtofabricateAt203p/Alcomposites.Thecompositesproducedbydectromagnefic菇拍喀processhavebettermechanicalperformance瞢戳those谤bell—fillingprocessorpre-formingproce
8、ss.Theamountofparticlesincompositesmadeb
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