by at least 40 u00b0 c the macro filler particles preferably having the lower melting point it was proven to be particularly effective to employ macro filler particles of a mean particle size between 0 2 and 10 0 micrometers preferably 0 2 to 2 0 micrometers and micro filler particles of a mean particle size between 0 01 and 1 5 micrometers preferably 0 01 to 0 3 micrometers and to use the macro filler and micro filler particles at a weight ratio of 1 1 12 regarding their size the macro filler particles and the micro filler particles are selected such that the ratio of their diameters is 5 20 1 the sinter temperature depends on the type of the macro filler and micro filler particles and generally is between 650 u00b0 to 1200 u00b0 c the temperature is selected such that during sintering the macro filler melts or starts to melt and the micro filler remains in the solid state the individual steps of the method of the invention will be more particularly described in the following macro filler particles of a mean particle size between 0 2 and 10 0 micrometers are intimately mixed with micro filler particles of a mean particle size between 0 01 and 1 5 micrometer at a weight ratio of 1 1 12 in a ball mill or other mixer suitable for mixing solids while adding a liquid such as water.