본 연구는 국내에서 사용되는 건조방법 (열풍, 마이크 로웨이브, 진공 등)으로는 물리적 한계에 의해 건조소요 에너지, 품질 저하 및 건조속도의 한계 등이 새로운 건 조방식의 요구를 만족 시켜주지 못하므로, 비가열 건조 를 위해 실험용 초음파 건조기를 개발하였다. 건조조건 은 4수준으로 하였으며, No. 1은 초음파 및 열풍 없이 외기, No. 2는 초음파만, No. 3은 열풍만, No. 4는 초 음파 및 열풍으로 총 4가지 조건으로 당근 및 인삼 절 편을 건조기 내에서 30분간 건조를 하였으며, 전·후의 중량을 측정하여 건조정도를 판단하였다. 초음파 및 열 풍으로 건조한 No. 4가 건감율이 가장 높았으며, 당근 절편의 건감율은 22.4% (w.b.)/h 및 인삼 절편은 3.8% (w.b.)/h로 나타났으며, 건조물의 변색 및 절편의 뒤틀 림은 거의 열풍만으로 건조한 No. 3과 거의 비슷한 정 도로 나타났다.

Powder forging is used for heavy-loaded parts (rings of rolling-contact bearings, gears etc.) production. Rolling contact fatigue is material property values of which characterize possibility of practical utilization of such parts. Rolling contact fatigue of some steels obtained out of prealloyed powders Astaloy CrM, Atomet 4601, Atomet 4901 and powder blends iron-carbon-nickel by hot forging is studied in the present paper. Effect of various kinds of heat and thermomechanical treatment on rolling contact fatigue is determined. Thermomechanical treatment provides optimal values of rolling contact fatigue. In this case steel structure contains up to 40% of retained metastable austenite which is transformed to martensite on trials. Thus typically crack is generated on residual pores and non-metallic inclusions instead of martensite zones in wrought steels.

By means of magnetic pulsed compaction and sintering of weakly aggregated alumina based nanopowders the jet forming nozzle samples for the hydroabrasive cutting were fabricated. The ceramics was obtained from pure alumina, as well as from alumina, doped by , MgO and AlMg. It was shown that the samples sintered from AlMg doped powder have the best mechanical properties and structural characteristics: relative density , channel microhardness. - 18-20 GPa, channel surface roughness , average crystallite size .