Modulus of elasticity of some refractory compounds

Conclusions Measurements were made of the moduli of elasticity of nonporous refractory compounds prepared by the method of diffusion impregnation. The following values were obtained: 49,300±2000 kg/mm² for NbN, 58,700±2000 kg/mm² for TaN, 58,000±2000 kg/mm² for NbC, 65,000±2000 kg/mm² for NbB₂, 70,000±2000 kg/mm² for TaB₂, 68,500±2000 kg/mm² for Mo₂B₅, and 79,000±2000 kg/mm² for W₂B₅.Translated from Poroshkovaya Metallurgiya, No. 3 (63), pp. 32–33, March, 1968.     

The wear resistance of some refractory compounds

Conclusions The data obtained on the wear resistance of some refractory compounds coupled in dry friction tests indicate that they are promising materials for friction couples in a number of cases.Translated from Poroshkovaya Metallurgiya, No. 2 (74), pp. 86–87, February, 1969.     

Abrasive power of some nonmetallic refractory compounds

Conclusions An analysis is made of threoretical concepts leading to the establishment of a relationship between the electronic structure and abrasive power of nonmetallic compounds. Experimentally-determined values of abrasive power of various simple and composite nonmetallic compounds are given. The data presented are of considerable theoretical and practical interest in that they permit formulation of new abrasive materials for specific service applications.Translated from Poroshkovaya Metallurgiya, No. 3 (63), pp. 37–41, March, 1968.     

High-temperature friction of refractory compounds

The paper overviews long-term studies into the behavior of metallic (carbides, borides, and nitrides of transition metals), and nonmetallic (boron and silicon carbides, aluminum nitride) refractory compounds as well as composite materials based on them in high-temperature friction in vacuum and air. The friction characteristics (wear rate and friction coefficient) are indicated as a function of temperature in the range from room temperature up to 1000–1400 °C. Data of x-ray examination and electron microscopy of friction surfaces are cited. The fracture mechanism for contacting surfaces of materials in friction is considered. __________ Translated from Poroshkovaya Metallurgiya, Vol. 47, No. 1–2 (459), pp. 167–178, 2008.