Influence of the composition of the boroning mixture on the dimension change of pressed and boroned samples from iron powder

Abstract

Volume changes occur during sintering and chemical-thermal treatments of metal powder samples. The results of the investigation of the volume change of pressed and boroned samples from an iron powder, depending on the mixture composition used for the boroning process, are presented in this paper. The basic mixture, used for boroning of the investigated samples from iron powder, is modified by the addition of activators with different chemical compositions and in different concentrations, of up to 4 wt %. Mixtures with ammonium bifluoride, ammonium chloride and boron potassium fluoride were investigated. The research results and the mathematical modelling enable the choice of mixture compositions for boroning based on the volume change given in advance

Optimization of the aging regime of Al-based alloys

“…Metod simpleks-planova omogućava dobijanje složenih modela istraživanih zavisnosti [7][8][9][10]. Ovo je naročito važno, jer su linearni ili kvadratni modeli retko kad adekvatni pri variranju temperature i vremena u širokim granicama, a primena faktornih planova u cilju dobijanja modela trećeg ili viših stepena zahteva suviše veliki broj eksperimenata [5,6,[13][14][15][16][17][18][19].…”

“…U radu je za izbor optimalnog režima starenja AlCu5PbBi legure primenjena metoda simpleks rešetke. Analizom literature koja se bavi ovom problematikom može se zapaziti da su u sličnim slučajevima, specijalni planovi nazvani simpleks-planovi, dobro razrađeni i obično se primenjuju u nauci o metalima pri proučavanju osobina legura u zavisnosti od sastava i pri optimizaciji sastava višekomponentnih smeša [2][3][4][5][6][7][8][9][10], kao i pri određivanju važnih karakteristika dijagrama ravnotežnih stanja [6,11,12].…”