Abstract
The precursor of Matrix A3-3 is made by quasi-isostatic cold moulding of graphite grains which had previously been covered by a phenolic resin as a binder. The graphitic Matrix is produced by heat-treatment of this precursory material. Compact specimens of precursory, original, and oxidized A3-3 were studied by SANS. The coherent macroscopic differential neutron scattering cross sections dΣ dΩ are very similar for the precursory A3-3 and the previously studied binder carbon-free Poco graphite AXM-5Q1 over a wide range of the scattering vector h. dΣ dΩ data for original and oxidized (burn-off of 2 wt%) A3-3 are almost identical and the plots ln dΣ dΩ versus ln h show a shoulder at h ∼- 0.08 A −1, which is due to a large concentration (1.5 vol%) of pores with a radius of gyration R g ∼- 12 A in the binder carbon. Assuming spherical pore shape, the volume fraction/radius distribution was estimated using the Harwell Maximum Entropy Code. The interfacial area and the volume of pores with a radius <200 A were calculated and are compared with data obtained previously from nitrogen adsorption isotherms. It is concluded that the main effect of oxidation is the opening of pores in the binder carbon.
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