Abstract: The present invention relates to production of superhard materials.A carbon composition contains 18-38 wt. % of diamond having particle size of 40-120 .ANG. and graphite to make up 100 wt. % having particle size of 200-1000 .ANG..A process for producing the carbon composition consists in detonating a carbon-containing explosive having a negative oxygen balance, in a cooling medium containing 40-60 vol. % of carbon dioxide gas, not more than 2 vol. % of free oxygen, and a neutral gas to make up 100 vol. %.The present carbon composition will find predominant application as an abrasive for superfinish polishing.

Abstract: According to the method for joining a fiberglass plastic rod to a metal fitting of an electrical device, a bore is first provided in the metal fitting, the diameter of said bore being somewhat greater than that of the fiberglass plastic rod. One of the rod's ends is then installed in the bore, and the gap defined between the bore formed in the metal fitting and fiberglass plastic rod is filled with a porous material. The whole is then compressed by using the pulse loading technique. The use of pulse loading for joining the fiberglass plastic rod to the metal fitting makes it possible to develop a high pressure in the zone of the joint without destroying the rod; this task is facilitated by the presence of the porous layer between the rod and metal fitting. Compression by pulse loading does not necessitate the use of expensive equipment, nor does it impose stringent accuracy requirements upon the elements to be joined.