Poeosity as a factor in the elastic modulus of zirconium and niobium monocarbides

Conclusions The influence of the porosity on the elastic properties of niobium and zirconium monocarbides can be described satisfactorily by exponential type equations in which the parameter P/(1–P) (P is the porosity) is the argument. It was established that Young's modulus for the nonporous carbides is 47,900 kg/mm² for NbC_0.98, 40,000 kg/mm² for ZrC^0.95, and 38,900 kg/mm² for ZrC^0.91.The shape and relative orientation of the pores do not influence the value of the exponents to a significant extent.Translated from Ogneupory, No. 2, pp. 47–49, February, 1976.     

Dimensional effect in percolation processes

Conclusions Analysis of the geometrical special features of the sintered granular systems with large differences in the particle size of the components makes it possible to explain, to a first approximation, the experimentally detected dimensional effects of resistance variations.The proposed method of analytical evaluation of the variation of resistance can be used for predicting the nature and scale of the expected effects in a wide range of the variation of the determining parameters with the accuracy ± (20–25)% which is comparable with the scatter of the experimental data caused by fluctuations of the determining parameters in processing (by the particle size of the conductor and the insulator, residual porosity, the properties of the initial components and percolation parameters x_c, t).Translated from Poroshkovaya Metallurgiya, No. 7(283), pp. 64–71, July, 1986.     

Reaction of TiB2 with Re

Conclusions The constitution diagram constructed for the quasibinary TiB₂-Re system is of the eutectic type, with T_eut = 2500 ± 50°K. The eutectic composition is 22 wt.% TiB₂ + 78 wt.% Re. The system is characterized by small intersolubility of its components. The eutectic temperature recorded is the highest of any MeIVB₂-Re system.Translated from Poroshkovaya Metallurgiya, No. 2 (230), pp. 76–78, February, 1982.