**4. Conclusions**

Analysis of relationship shown in Figure 22 and 23 confirmed that the minimum value of surface roughness BNDCC samples was obtained at the peripheral speed of grinding wheels in the range 14-16 m/s and 0.005 mm depth of grinding/double stroke of table. These data

**•** the research glass fulfilled their utility criteria as binders for super hard abrasive tools;

**•** glass received by frytting method belonged to the group of light glasses (ρ <2.64 g / cm 3).

**•** thermodynamic calculation of chemical stability of glass precursors were conducted by VCS algorithm. It was shown in accordance with first assumption that the three compounds were stable in solid states at high temperatures: barium silicate, silicon dioxide, aluminum borosilicate; in the second assumption only one (barium borosilicate). X-ray crystallographic studies have not confirmed the presence of compounds. Investigated samples were in pure

**•** differential scanning calorimetry of precursor glasses showed their distribution with the

**•** substrates were wetted well by all variants of glasses, although in all cases submicrocrys‐ talline sintered corundum was wetted better than silicon carbide. Microscopic observation of samples transverse glass-substrate systems contains submicrocrystalline sintered corundum after the wettability studies showed the presence of narrow interlayer contained barium. In -case of transverse specimens with silicon carbide substrates were much wider,

**•** the flexural strength showed the highest values was obtained by W1 and Ba23 bis glass. The

**•** diamond wheels with D46 or D25 grains and Ba23 bis or W1 binders fulfilled the criteria of

Tables 3, 4) showed a very good result under the processing conditions. It was observed that the most favorable results are obtained when the samples of BNDCC composite was machining in – the grinding depth of 0.005 mm/double stroke of table and the peripheral

**•** the results of the geometrical structure of the surface of the BNDCC composites showed that the grinding surface roughness was Ra 0.018 -0.04 μm compared to the initial roughness of

probably resulted from the presence of -silicon in glass and substrate;

work of destruction was tree times lower for W3 glass than W1 glass;

C. The whole sets underwent complete

/mm⋅s], G (listed in

/s] Q'w [x10-3mm3

verified the results of performance tests of these samples.

**3. Summary and conclusion**

74 Sintering Techniques of Materials

amorphous form;

homogenization above 1,350° C;

utility in the flat grinding process;

speed of the wheel of 15 m/s;

Based on the survey it can be concluded that:

It was completely transparent with a bluish tint;

separation of water or CO2 to a temperature of 350o

**•** analysis of grinding process efficiency Qw [x10-3mm3

**•** the use of diamond wheels with newly developed vitrified (ceramic) binder in conventional grinding technology has allowed to obtain a mirror of BNDCC composites.

*Presented research results were obtained within the project: "Application of modern BNDCC and DDCC composites for cutting tools", Applied Research Program – Contract No. PBS1/A5/7/2012 financed by The National Centre for Research and Development in Poland*
