2,2-二(3,5-二氨基- 4-羟基苯基)丙烷的合成

2,2-二(3,5-二氨基-4-羟基苯基)丙烷是一种新型膨胀型阻燃剂和合成N-P系膨胀型阻燃剂的中间体。研究了Fe-A l/C催化水合肼还原2,2-二(4-羟基-3,5-二硝基苯基)丙烷合成2,2-二(3,5-二氨基-4-羟基苯基)丙烷的反应条件。结果表明:对20 mmol的反应物,Fe-A l/C催化剂的用量为0.6 g,反应温度为75℃,反应时间为5 h,物料比n〔2,2-二(4-羟基-3,5-二硝基苯基)丙烷〕∶n(水合肼)=1∶12时,还原产率为93.75%,w〔2,2-二(3,5-二氨基-4-羟基苯基)丙烷〕=96.5%(HPLC),Fe-A l/C催化剂可以重复使用7次。产物经元素分析、红外光谱、核磁共振和质谱分析确证。     

铁-铝金属间化合物涂层退火工艺的正交试验设计

采用火焰喷涂-感应重熔工艺在45钢基体上制备铁-铝金属间化合物涂层,对其退火热处理工艺进行正交设计,得出优化的工艺为750℃退火1.5 h。优化退火后涂层的磨屑及磨损后试样表面形貌分析表明:涂层的主要磨损机制开始为粘着磨损,随后转变为磨粒磨损。由扫描电子显微镜分析可知:退火后铁-铝金属间化合物涂层由固溶体、条块状碳化物、氧化物和孔隙组成。     

Effects of Mo and Zr on Microstructure, Mechanical Properties and Wear Resistance of Fe-Al Based Alloys

In this work the microstructure, mechanical properties and wear resistance of Fe-Al based alloys with various alloying elements were studied. The microstructures were examined by optical and scanning electron microscopy （SEM） equipped with an energy dispersive X-ray spectroscope （EDS）. Two types of alloys were prepared by vacuum arc melting. One is Fe-28Al based alloys （D03 structured） with and without alloying elements such as Mo and Zr. The other one is Fe-35Al based alloys （B2 structured） produced with the same manner. For both types of alloys, Mo addition had found to exhibit an equiaxed microstructure, while dendritic structure was observed to show the effect of Zr addition. These microstructural features were more evinced with increasing content of alloying element. Concerning the mechanical properties and wear resistance, Fe-35Al based alloys were superior to Fe-28Al based alloys over the whole temperature range investigated.     

高速电弧喷涂Fe-Al/WC复合涂层在800℃下的氧化行为

采用高速电弧喷涂技术 (HVAS)在 2 0G钢基体上制备了Fe Al/WC金属间化合物复合涂层 ,测试了涂层在 80 0℃下的氧化性能。结果表明 ,Fe Al/WC复合涂层的氧化动力学曲线呈现出近似对数规律 ,5h后的氧化速率低于 2 0G钢 ;涂层的氧化物以Al2 O3、Fe2 O3、Fe3O4 和FeO为主 ,且分布不均匀 ;涂层表面优先形成具有保护性的Al2 O3膜 ,阻止了涂层的进一步氧化。     

高温金属布袋在玻璃熔窑烟气除尘中的实验与应用

玻璃熔窑烟气(尤其是石油焦工况)高温除尘一直是玻璃行业的一个技术瓶颈,也是玻璃行业烟气除尘的一个主要研究方向。通过分析金属布袋的成型、除尘原理及在工程中试中的情况,为玻璃行业高温除尘提出新的方向与思路。     

Relationship between interfacial structure and property of steel-mushy Al-28Pb bonding-pate

1INTRODUCTION SteelAl28Pbbondingplateismadeupof steelplateandAl28Pballoylayer[13].Steelplate hasahigherstrength,andAl28Pballoylayerhasexcellentheatconductivityandperfectlubricating property.Thusthisbondingplateisanidealmate rialofneotypebearingwhichiswidelyneededinmachineryandautomobilefields[46].Forthis bondingplate,theinterfacialmechanicalproperty thatdeterminesthesafetyofproductisveryim portant.Thehighertheinterfacialmechanicalproperty,thesafertheproduct.Interfacialmechanicalpropert…     

Fe-Al复合催化剂催化水合肼选择性还原硝基制备对氯苯胺

以对氯硝基苯为原料,用Fe-Al复合催化剂催化水合肼选择性还原硝基制备对氯苯胺。实验结果表明:还原对硝基氯苯1.57g(10mmol),最佳催化剂组成A0.5g已处理的活性炭,FeCl3溶液(0.01mol/L)10ml和AlCl3(0.01mol)1ml;最佳反应温度为70℃;最佳原料配比为N(对硝基氯苯):N(NH2NH2·2H2O)=1.0:2 0;催化反应的选择性大99％,无脱氯副反应;对氯苯胺的收率为84.6％;讨论了各种因素对工艺过程的影响。     

Fe-Al复合催化合成邻氯苯胺

研究了Fe-Al复合催化剂催化水合肼选择性还原硝基制备邻氯苯胺的条件。结果表明:Fe-Al复合催化剂催化水合肼还原硝基的选择性≥99%;还原反应的温度为70℃,物料比为n(邻氯硝基苯)∶n(水合肼)=1.0∶1.8,邻氯苯胺的收率为92.91%,ω(邻氯苯胺)≥99.5%。在工业上具有更广泛的应用价值。     

Influence of oxides on high velocity arc sprayed Fe-Al/Cr_3C_2 composite coatings

1INTRODUCTION Arcspraying(AS)isatechniquethatthemet alisheatedtodropletsbyanelectricarcandthensprayedontosubstratesbythecompressedair. Highvelocityarcspraying(HVAS)technologyisdevelopedonthebasisofAS.Aspecialtubede signedaccordingtotheprincipleofaerodynamicsis mountedattheexitofcompressedair.Theveloci tyanddistributionofmelteddropletsbecomehigh erandmoreuniform,respectively.Asaresult,acoatingwithlowporosity(2%)andhighdensity andbondstrengthcanbeobtained[15].Fe Alin termetalliccompound…     

Oxidation performance of Fe-Al/WC composite coatings produced by high velocity arc spraying

Fe-Al intermetallics with remarkable high-temperature intensity and excellent erosion, high-temperature oxidation and sulfuration resistance are potential low cost high-temperature structural materials. But the room temperature brittleness induces shape difficult and limits its industrial application. The Fe-Al intermetallic coatings were prepared by high velocity arc spraying technology with cored wire on 20G steel, which will not only obviate the problems faced in fabrication of these alloys into useful shapes, but also allow the effective use of their outstanding high-temperature performance. The Fe-Al/WC intermetallic composite coatings were prepared by high velocity arc spraying technology on 20G steel and the oxidation performance of Fe-Al/WC composite coatings was studied by means of thermogrativmetic analyzer at 450, 650 and 800°C. The results demonstrate that the kinetics curve of oxidation at three temperatures approximately follows the logarithmic law. The composition of the oxidized coating is mainly composed of Al₂O₃, Fe₂O₃, Fe₃O₄ and FeO. These phases distribute unevenly. The protective Al₂O₃ film firstly forms and preserves the coatings from further oxidation. Foundation item: Project(50235030) supported by the National Natural Science Foundation of China; Project(98BK014) supported by the Foundation of State Economy Trade Committee of China