HB 5457-1990 Powder metallurgy copper-based clutch friction plate

GB/T 4309-1984 Classification and designation for powder metallurgy materials GB/T 4309-2009 Classification and designation for powder metallurgy materials GB 440-1977 Aviation lubricating oil No.20 GB/T 443-1989 Lubricating oils for total loss systems L-AN GB/T 5163-2006 Sintered metal materials, excluding hardmetals—Permeable sintered metal materials—Determination of density, oil content, and open porosity GB 8002 GB/T 9097.1-2002 Sintered metal materials,excluding hardmetals—Determination of apparent hardness Part 1:Materials of essentially uniform section hardness HB 5434.10-1989 The method for inspecting the quality of bonding between the brake material and steel backing of airplane wheels and the plastic deformation of the steel backing after sintering HB 5434.10-2004 Test methods for aircraft wheel friction materials-Part 10:Inspection method for bonding ability between friction material and steel base and plasticity of steel base HB 5434.7-1989 Aeronautical landing gear brake material friction test method HB 5434.7-2004 Test methods for aircraft wheel friction materials-Part 7:Test method for friction propertie