Abstract: An abrasive compound in which individual abrasive grains of various types are joined in a preliminary step into the formation of so-called agglomerated abrasive grains, each of which may contain a number of individual grains. The particular feature of the invention is that the abrasive compound which is to be applied to a suitable surface to constitute an abrasive or grinding tool consists of a mixture of agglomerated abrasive grains of substantially different types. The differences in the agglomerated abrasive grain refer principally to the abrasive power and strength and the ability to sustain abrading forces, i.e., they are related to the endurance of the agglomerated grains under conditions of use. The substantially different strengths or properties of the agglomerated abrasive grains may derive from different types of binder used to create them from the individual grains, different methods of hardening or drying, different quantities of binder, or different constituent individual grains.

Abstract: A process for coating inorganic substrates, especially metallic or metalloid substrates, sintered metal carbides and carbon materials with carbides, nitrides and/or carbonitrides, using certain nitriles as sources of carbon and nitrogen, is described. High deposition rates and smooth coatings of good to very good adhesion are achievable by this process.

Abstract: A process for producing diffusion layers of carbides, nitrides and/or carbonitrides on metallic or metalloid substrates, using certain nitriles as sources of carbon and nitrogen, is described. Uniform and well-adhering diffusion layers can be produced in short reaction times by means of this process.

Abstract: A process for producing diffusion layers of carbides, nitrides and/or carbonitrides on metallic or metalloid substrates, using certain triazines and pyrimidines as sources of carbon and nitrogen, is described. Uniform and well-adhering diffusion layers can be produced in short reaction times by means of this process.