Nonequilibrium dual-phase flows

Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 12, pp. 16–18, December, 1991.     

Producing blanks by cutting in stamps

The use of stamps to cut precise short blanks whose length is less than their diameter is studied theoretically and experimentally. On that basis, parts of high geometric precision may be obtained.     

Reaction of poly(vinyl butyral) with tetraethyl orthosilicate: grafting of siloxane chains and new composites

New graft copolymers with side polysiloxane chains were synthesized by sol–gel reaction of acid‐catalyzed hydrolysis of tetraethyl orthosilicate in the presence of poly(vinyl butyral). The grafting is realized by exchange reaction of the alkoxyl moieties in siloxane and acetal groups. When the reaction is carried out in non‐hydroxylic solvent (1,1‐dimethoxyethane) inter‐etherification with participation of the residual hydroxyl groups of poly(vinyl butyral) is also important. The copolymers obtained contain free silanol groups which are active in complexing with polymeric bases by hydrogen bonds, with formation of new composites. Copyright © 2004 Society of Chemical Industry     

Wear resistance and fatigue strength of titanium alloy VT-8 with vacuum-diffused coatings

It was established that vacuum-diffusion contactless manganizing and chromizing produces a 2.5 to 3-fold increase in the wear resistance of a titanium alloy VT-8, whose fatigue strength is reduced by 50% after these treatments due to a columnar grain structure of diffused coatings.