An iron based alloy powder (Fe-2.0Ni-1.0Cu-0.8Cr-0.5C) was used as raw material to prepare high density iron based alloy by warm die high velocity compaction (WHVC). The effects of warm die on high velocity compaction (HVC) densification behaviour, variations of stress waves and the resulting mechanical properties of iron based alloy were studied. The results show that, under the warm die condition at 1008C, the HVC behaviour of powder changes and the green density improves. Compared with the compacts prepared by HVC, the green density of compacts prepared by WHVC is 0.09-0.27 g cm 23 higher at the impact velocity range of 6.2-8.7 m s 21 . The green density of compacts prepared by WHVC reaches 7.62 g cm 23 at 7.9 m s 21 . The compacts were sintered at 11508C in H 2 atmosphere. The tensile strength, yield strength and hardness of the heat treated samples reach 1571 MPa, 1360 MPa and 51.2 HRC respectively.
The experimental study and safety analysis was carried out on low concentration coal bed methane enrichment by PSA based on the explosion triangle. The results show that the traditional PSA approach of using single adsorbent probably makes methane concentration very close to the explosion limit and may result in explosion risk in the adsorption process, when the methane concentration in coal bed methane is blow 30%. A new method was brought forward for low concentration coal bed gas safe enrichment with the use of both actived carbon and CMS as adsorbents, so that methane and oxygen in low concentration coal bed gas can be adsorbed simultaneously. The concentration of CH 4 and O 2 can be controlled well and will not exceed the explosion limit in both adsorption and desorption process.
According to the GH3044 nickel-based superalloy with high yield strength, a new approach for superalloy tube named Tube Solid Granules Medium Forming (SGMF) was present, and tube SGMF process principle and the mechanical model of solid granules were designed. The superalloy tube SGMF process was investigated numerically by using User subroutine of Abaqus software, the deforming simulations of two groups of tube products were performed separately, and the elongation rate and thickness distributions of the products were analyzed. An experimental system was designed and developed for tube SGMF, typical GH3044 superalloy tubes were deformed, good correlation was observed between the simulation results and experimental data.
The theoretical composition was made from MgO-rich MgAl2O4 (MR66) and alumina powder. The static crucible method was used to study alkali-resistance of the block samples. It has been observed that alkali steam permeated into the hole and reacted with corundum particles that produced β-Al2O3 by means of XRD, SEM and EDS. It led to volume expansion, cracks and melting erosion of corundum particles. The specimen of the 32% content of MgO has good physical and chemical properties and excellent alkali erosion performance. So the specimen is suitable for oxy-fuel combustion for glass melting furnace.
Unfired specimens were made with different aluninum content (0,2%,4%,6%,8%) respectively ,using high pure magnesia , magnesia-spinel and Aluninum as the main raw material. Unfired specimens were treated under the condition:110°C×24h drying,then 300°C×6h heating treatment.The properties and microstructure of the specimens were analyzed to investigate the reaction mechanism of these speciments and RH refinery slag.The result are shown that the addition of aluninum improves cold crushing strength of specimens,reaching to 63Mpa. The specimen with aluninum content of 8% shown the best slag resistance. The reaction mechanism between aluninum-magnesia-spinel complosite material and RH slag is different from magnesite-chrome brick. The major penetration element is Ca, and the Ca elment penetrated into the matrix reacts with corundum turning out a CA2 protective layer which can stop penetrating of slag.
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