Sintering additive

Continued part 1, part 2 of ebook "3D printing and additive manufacturing technologies" provide readers with content about: reconstruction of damaged parts by integration reverse engineering (RE) and rapid prototyping (RP); the impact of additive manufacturing on Indian GDP; optimization of the print quality by controlling the process parameters on 3D printing machine; parameter optimization for polyamide in selective laser sintering based on mechanical behavior;...

146p damtuyetha 16-02-2023 1 1   Download

Once the mechanical properties of printed TPU are characterised, a novel, low cost, and environmentally friendly method for concrete casting using printed TPU moulds is proposed in this thesis. Additively manufactured TPU mould is developed to cast complex concrete structures. A planar topologically optimized cantilever and a free-form 3D column are cast using the proposed TPU mould. Good surface quality is obtained for the cast concrete elements, and the moulds can be reused many times after cleaning.

98p runthenight04 02-02-2023 6 3   Download

The aim of the present work is to investigate and to compare the influence of the two sintering additives Cr2O3 and TiO2 on the porous structure and the mechanical properties of the sintered porous alumina. Alumina based porous ceramics were fabricated by sacrificial template technique via powder metallurgy route from alumina powder using ammonium bicarbonate (NH4)HCO3 as the pore former. T

5p cothumenhmong11 10-05-2021 10 2   Download

he effect of the ZnO addition in pure perovskite PZT−PMnN−PSbN ceramics sintered from 950 to 1200oC has been investigated. The phase structure of ceramics changes from rhombohedral to tetragonal and the temperature decreases with the increase of the ZnO content. The limitation of Zn2+ concentration for the solubility in PZT–PMnN–PSbN systems is about 0.25% wt., at which the ceramic shows some good physical properties such as the density of 8.20 g/cm3 , some dielectric constants including εr = 1,555 and εmax = 32,900.

9p nguaconbaynhay9 03-12-2020 7 0   Download

Additive Manufacturing (AM) is a process of joining materials to make objects from 3D model data, usually layer by layer, as opposed to subtractive manufacturing methodologies. Selective Laser Melting, commercially known as Direct Metal Laser Sintering (DMLS®), is the most diffused additive process in today’s manufacturing industry.

16p toritori 11-05-2020 14 1   Download

The rapid increase in emissions of major greenhouse gases such as CO2 and CH4 in the last decade has seriously affected the climate change and the living environment in the world in general and in Vietnam in particular. In addition, the demand for effective use of CO2 - rich natural gas has promoted studies to find new, highly active and stable catalysts for the methane reforming process. NiO has proven to be the most suitable catalyst for industrial application of the reforming process.

13p nguathienthan2 24-12-2019 21 0   Download

A combination of gel-casting and polymeric foam infiltration methods is used in this study to prepare porous bodies of hydroxyapatite (HA), to provide a better control over the microstructures of samples. These scaffolds were prepared by impregnating a body of porous polyurethane foam with slurry containing HA powder, and using a percentage of solids between 40% and 50% w/v, and three different types of monomers to provide a better performance.

8p kequaidan1 16-11-2019 8 0   Download

Research results on 3D modeling of the diamond grain and its bearing layer when sintering diamond grinding wheels are provided in this paper. The influence of the main characteristics of the wheel materials and the wheel production process, namely the quantity of metallic phase within diamond grain, coefficient of thermal expansion of the metallic phase, the modulus of elasticity of bond material and sintering temperature, on the internal stresses arising in grains is investigated. The results indicate that the stresses in the grains are higher in the areas around the metallic phase.

8p kequaidan1 16-11-2019 21 1   Download

The oxidation behavior of two types of inhomogeneous nickel was investigated in air at 1273 K for a total oxidation time of 100 h. The two types were porous sintered-nickel and microstructurally inhomogeneous cast-nickel. The porous-nickel samples were fabricated by compacting Ni powder followed by sintering in vacuum at 1473 K for 2 h. The oxidation kinetics of the samples was determined gravimetrically. The topography and the cross-section microstructure of each oxidized sample were observed using optical and scanning electron microscopy.

13p trinhthamhodang1 14-11-2019 28 1   Download

The relative density and Vickers micro-hardness of W-K-TiC alloys was enhanced with TiC addition and the highest Vickers micro-hardness is 731.55. As the TiC addition increased from 0.05 to 2 wt%, the room-temperature tensile strength raised from 141 to 353 MPa. The grain size of the W-K-TiC alloys decreased sharply from 2.56 mm to 330 nm with the enhanced TiC doping. The resistance to thermal shock damage of W-K-TiC alloys was improved slightly with the increased TiC addition.

8p minhxaminhyeu3 12-06-2019 12 0   Download

Preparation of a high purity powder is one of the most important steps in producting transparent MgAl2O4 ceramic. Additionally, the particles are required to have nanoscale scale, uniform size and least agglomeration, which make diffusion enhanced at grain boundary during sintering process, promote densification to achieve full dense bulk material.

7p visasuke2711 25-04-2019 11 1   Download

• This chapter aims to provide additional information on several techniques of metal forming processes other than those conventional process already mentioned in previous chapters. • The requirements for the process selection will be added, which are based on advantages and disadvantages of each type of non-conventional metal forming processes.

12p tieulac 27-11-2010 64 6   Download