泡沫碳(初改)

1、Carbon FoamGroup.12 Lecturer: 冷九够 PPT makers: 贾微 陈国顺 Thesis authors: 邓亚凯 孙凯 李黎 沈陶1Definition and History Content2Preparation methods3Performance4Application and Prospect0101The late 1960sWalter Ford got a reticulated vitreous carbon(RVC) foam by the means of thermosetting polymer pyrolysis.0202Early

2、 1990sHager Predict the graphitized carbon foam with the ligament type grid structure which differs from previous carbon foam through the model analysis.0303In 1998Oak Ridge National Laboratory(ORNL) prepared carbon foams using mesophase pitch as raw material.1. Definition and HistoryCarbon foam is

3、a lightweight cellular material interconnected by holes apertures cell wall which have a three-dimensional network structure.Thermal conductivityThermalCompression modulusMechanicsAnti-magnetic seismicElectromagnetic PerformanceOthers2.1 Thermal conductivityFeature: High thermal conductivity at low

4、density.2.2 Mechanical propertiesHigh specific strength;Better mechanical properties at lower densities;Compressive strength is closely related to its pore foam structure.2.3 ElectromagneticUnique pore foam structure can consume electromagnetic and shock wave.2.4 Other propertiesCarbon foam shock ab

5、sorption energy storage material catalyst carrier antivirus chemical warfare Preparation methodsABC methodsAOrganic polymer materialsBMesophase pitch materialsCOther materialsEmulsion method3 1Template method 2Thermal decomposition methodHigh pressure foaming3.1 3.1 Organic polymer Organic polymer m

6、aterialsmaterials4Template methodPolymer, Vesicant, AdditiveMerit:Process is simple, low costs Defect:Template will limit the morphology and structureRapid mixingPouring, FoamingCuring, StrippingCarbonizationProductsSupercritical method3.2 3.2 MesophaseMesophase pitch materials pitch materialsSelf-f

7、oamingSelf-foaming methodMesophase pitch is placed in a reactorAdd the inert gasHeated to the softening point or higher under high pressure The release of light gasesKeep heating, solidifyCarbonization and GraphitizationSuperiority:1.Shorten the production period2.Reduce the production costsLimitations:The foaming conditions are demanding.(500800， P 7MPa)Filter Material1.Honeycomb porous structure2. High contact area3.Good corrosion resistance, low coefficient of expansion4.The open porosity is up to 85%4.1 Catalyst Material4.1 Catalyst Material Schematic diagram of spacecraft thermal