Thermal Decomposition and Particulate Emission Characteristics of Six Common Non-metallic Materials Used in Manned Spaceflight
Considering the potential risk of particles emitted by nonmetallic materials used in man-ned spaceflight,the pyrolysis and particulate emission of six kinds of nonmetallic materials(such as TPR rubber)frequently-used in space project were tested by means of high temperature heating and heat flux radiation igniting.The results showed that TPR rubber had a relatively higher fire risk grade,and its ignitability,combustion heat release and smoking rate were higher than other materi-als tested.Particle emitted by material pyrolysis demonstrated different distribution characteristics with the change of temperature,and the size distribution of materials with lower thermal stability shifted to larger size range with the increase of temperature.The distribution characteristics of parti-cle size counting and mass of the tested materials were not consistent.Different decomposition modes of materials can affect the morphology characteristics of the particulate matter emitted by materials.The pollutants listed in manned spacecraft control standard can be detected in the particulate adsor-bents.Therefore,exposure of human to the particulate adsorbents could cause health hazards.The results can provide reference for technologies such as monitoring,control and evaluation of pollutants as well as fire warning in spacecraft cabins.
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