A systematic study of Ti-Nb binary as-melt alloys has been carried out. The alloying content Nb varied from 10 wt % to 50 %. All were produced by vacuum arc melting in inert argon atmosphere and no further heat treatment was conducted research the structures. results indicate that below an 30 β-phase formed consist α'-phase, at Nb, or respectively, a mixture α' α"-phase 20 maximum hardness increases up peak 249 ± 6.95 HV0.05 decrease after it. compositions show higher microhardness than cp-Ti.

This study considers the structural features of Ni-Cr-Si-B (Ni - base; 15.1 % Cr; 2 Si; B; 0.4 C) materials obtained by different methods. The self-fluxing coatings were deposited plasma spraying on tubes from low carbon steel. Bulk cylinder specimens 20 mm diameter and 15 height spark sintering (SPS). structure phase composition these investigated optical microscopy (OM), scanning electron (SEM), transmission (TEM) X-ray diffractometry (XRD). major phases sintered are γ-Ni, Ni3B, CrB Cr7C3....

<p class="1Body">Considered the nature of changes in morphology carbides unalloyed high-carbon alloys type Damascus steel depending on degree supercooling melt, heat treatment and plastic deformation. It is shown that iron-carbon alloy with carbon content as white cast iron at high degrees can crystallize a steel. Considered three hypotheses for formation eutectic pure alloys. The first hypothesis based thermal process dividing plates secondary cementite or ledeburite isolated single...

Cp-Ti/TiB+TiC wear-resistance coatings produced by non-vacuum electron beam cladding of boron carbide and titanium powders are studied in the paper. The X-ray phase analysis composite microstructure showed that boride reinforcing particles evolved during process. obtained data good agreement with results optical microscopy. Undissolved initial powder detected coatings. microhardness test as well wear resistance materials under conditions loose abrasive conducted. It is established...

This paper assesses the moldability of press-powder with different fractional composition. Different types defects that occur in ceramic materials due to insufficient or overpressure molding press powderare analyzed. Based on results structural studies and evaluation physical properties recommendations selection modes press-powders composition provide absence compacts obtaining quality dense ceramics are formulated.

The paper assesses the effectiveness of uniaxial and cold isostatic consolidation methods medium size ceramic granular press-powders. results fractographic studies raw compacts were obtained with different forming. estimation physical properties sintered samples was done. measurement bending strength material are shown. It has been established that application forming, compared axial allows increasing flexural is more than 35% due to creating denser structure enhancing adhesion between...

In this paper the results of alumina aqueous suspension disaggregation with help bead and ball mills are shown. The changing maximum particle size for50 wt. % 90 powder (from lowest to highest size) in dispersed by a mill for one hour 48 hours was fixed. order achieve parameters given manufacturer disaggregating process sets defined.

In this paper the two methods of pre-operation green samples to hot isostatic pressing (HIP) were investigated. The influence method formation (uniaxial and cold pressing) temperature-time parameters on property was analyzed. Structural investigation carried out physical properties defined. recommendations for uses sintering modes HIP given.

A possibility of the SrAl 12 O 19 platelet formation in Al 2 3 – ZrO ceramic using SrCO or Sr 6 is evaluated. An impact two techniques synthesis on mechanical properties material investigated. Defects revealed sintered are analyzed. Recommendations best method phase materials given based structural and X-ray diffraction analyses as well tests. It shown that an addition wt% into ZTA results increase fracture toughness by up to 30 % comparison with initial material.

We studied the effect of modifier additives TiB2, AlMgB14, (NH4)2TiF6, NH4BF4, Ca3(PO4)2 on combustion parameters composite propellants based aluminum powder as a fuel (about 20% wt.), ammonium perchlorate an oxidizer 60% and energetic binder (MPVT about wt.). As result study, influence rate combustion, dimensionless mass agglomerate size was revealed.

Sintered compacts fabricated by spark plasma sintering (SPS) at 1050 о С were investigated. Titanium and aluminum powders in a ratio of 25 % (at.) 75 respectively chosen as starting materials. Powder mixture heating up to elevated temperatures led partial loss an component the formation multiphase structure consisting Al 3 Ti, 2 AlTi . The density sintered powder mixtures was 3.7 g/cm ; average microhardness value about 470 HV.

The paper presents X-ray diffraction and scanning electron microscope analyses, durometer measurements used to investigate the structural properties phase composition of nitride layers type 20Kh13 mild steel. A method nitriding by low-pressure arc discharge was applied along with combined surface treatment including ultrasonic finishing nitriding. It shown that within close-to-critical temperature range starting from 200oС, formed on pre-treatment its effect steel increased amount phases...

Abstract An experimental investigation of plasma-assisted nitriding austenitic stainless steel AISI 321 in a low-pressure (7 Pa), low-frequency (50–100 kHz) nitrogen inductively coupled plasma enhanced with ferromagnetic cores has been performed at the temperatures 470–625 °C, sample biases ‒500–‒750 V, current densities on surface 1.2–3.3 mA/cm 2 and times 20 60 min. It is found that even short (20 min) ion-plasma treatment results formation nitrided layers thickness up to 40 μm...

In this work 'Mo-Fe-C' coatings fabricated on medium carbon steel by non-vacuum electron beam cladding were investigated. The structure of and transition zones studied scanning microscopy (SEM). It was shown that an increase Fe percentage in the mixture led to a decrease eutectic volume fraction coating accompanied formation gradient between substrate material. Measurements microhardness cross section samples revealed 'Mo-C powder contributed 4.5-fold microhardness.

The influence of granulated powder binder/plasticizer ratio on epy microstructure and properties sintered ceramic specimens is shown using submicron alumina. fracture mode, analyses a green part samples obtained with different organic contained in are presented. It was stated that the usage PVA (grade 16/1) PEG 400 at an equal results uniform distribution die high density. also addition 2 wt. % PEG400 into granules press allows obtaining A1203 apparent density about 3,91 g/cm3 bending...