SU615148A1 - Iron-base sintered friction material - Google Patents

Description

dispersion-hardened material, increases its strength properties and, due to their high chemical resistance, is busy looking for material against corrosion. In tab. 1 shows the chemical composition in table. 2 - the main properties of the proposed material. The material is tested in an oil medium on an IM-58 friction machine with a load of 25 kg / s.M and an initial sliding speed of 8 m / s. 10 Example 1. Powders of graphite, titanium nitride and barium sulphate are dried at a temperature of 120-150 ° WITH. Then all the initial powders are taken in the following ratio, wt.%: 0.5 copper, 8 barium sulphate, 6 graphite, 5 sitalall and 79.5 iron, sifted-5, 1 finely dispersed (0.01-0.1 μm) titanium nitride powder and mixed in a mixer in the presence of acetone (100 ml per 1 kg of the mixture) for 12 hours. The prepared mixture is pressed in a mold at a pressure of 3 tons / cm, and the resulting products are fusion-bonded to the steel basis under pressure of 15 kg / cm 2 and a temperature of 10-20 ° C for 3 hours. The resulting material has the following 25 characteristics: 0.7 kgm / cm toughness of 12.0 kg / mm 2 Tensile strength of the friction coefficient in masle0,12

Chemical composition, weight. no fi xi ha no fi xi noi ni Wear material for 30 braking 8 µm Corrosion rate 0.35 mm / year. Example 2. The material obtained according to the technique given in example 1 from the forgings taken in wt.%: 2 copper, 6 barb, 6 graphite, 4 glass, 3 titanium and 77 iron has the following characteristics: 0.75 kgm / cm Impact viscosity Tensile strength 13.0 kg / mm 2 at stretching Coefficient of friction 0.12 Material wear per 30 braking 6 μm Corrosion rate 0.28 mm / year Example 3. Material obtained using the procedure given in example 1, from the forgings, taken in wt.%: 10 copper, 4 sulfur barium, 10 graphite, 3 sitalall, 6 nitas titanium and 67 iron has the following actions: Shock strike st 0.65 kgm / cm Tensile strength 11.8 kg / mm 2 tensile Coefficient of friction 0.12 Wear braking material 30 Corrosion rate of 0.24 mm / year. Thus, the application of the proposed material provides higher anicic and corrosive properties of appearance with known materials. Table 1

Physical and mechanical properties

12,00,12

13,00,12

11,80,12

Table

80.35

60.28

Claims (2)

70.24 5 615148 Formula of the invention Iron-based sintered friction material containing copper, barium sulphate, graphite and sitall, characterized in that, in order to increase strength and 5 corrosion resistance, it additionally contains titanium nitride at the following ratio of components, wt.% : Copper 0.5-10 Barium sulphate 4-8№ g Graphite 6-10 Titanium nitride 1-b Sitall 3-5 Iron Else, Sources of information taken into account when exprinted Copyright certificate of the USSR 503927, cl. C 22 C 33/02, 1974. 2. USSR author's certificate 460318, cl. C 22 C 38/16, 1973.