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 Wysłany: Nie 2:00, 16 Sty 2011 Temat postu: Moncler online Tantalum powder metallurgy processi |
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Tantalum powder metallurgy processing
Cloth uniform. HIP temperature the speed of the grain size of samples heated to 800 ℃, thermal insulation in the 8oo ℃ 30m / n, is approximately twice the low-temperature HIP samples. Hypoxia ancient then the rate of 27 ℃ Ⅱ heated to 2400 ℃. The amount of the grain size of samples much larger than high oxygen. In all of the sintered products were observed in the oxygen density gradient samples, grain boundary movement likely to occur, the hole in the closure, the surface of the blank near the center line of the induced density than in grain gathered before. In the HIP process, the billet is in a closed bag comprising 4 (ie, gas can not escape) carried out,[link widoczny dla zalogowanych], so the old high levels of oxygen available to more of the oxide powder grain boundary peg to limit their migration, so holes before they occur in the grain growth through grain boundary diffusion and closed sets. Gap element tangled residual hydrogen and oxygen, the HIP sample hardness increased. These elements have to ask Yao c solid solution strengthening and dispersion hardening. Low pressure plasma spraying (LPPS) tests were carried out low and fast jet pilot. There is no high-speed jet resultant melting of ancient spherical powder particles, the density is much lower than the low speed. Low speed deaf mouth, the plasma sprayed particles melting occurred in flight, the resultant distribution of thin, high density (greater than 95% theoretical density), LPPS has the advantage of solidification in the part of the vacuum can reduce the oxygen content . Flat-rolled tantalum plate inverse pole figure shows the gradient of the texture of tantalum plate,[link widoczny dla zalogowanych], tantalum sheet of plate centerline Organisation the plate surface texture is texture,[link widoczny dla zalogowanych], this remarkable stone block could lead to uneven mechanical tissue performance. In contrast, the production of powder metallurgy products by HIP show no preferred orientation, so use this technique successfully produced a non-textured tantalum products, and is expected to be isotropic mechanical properties. Deformation rate at room temperature under a certain compression test results do show that: high oxygen, the amount of powder material in the ancient hypoxia l600 ℃ and l8oo ℃ H ratio of the yield strength of powder metallurgy products processing (Ta-DD) much larger plate, the strain rolled plate with a considerable hardening rate. While noting that the amount of oxygen the ancient relationship with the flow stress are proportional. Therefore, the following conclusions: (1) HIP products than the high density of sintered products. (2) high oxygen content of the powder by HIP ancient fully dense after hypoxia the amount of powder by HIP old after a very fine pore distribution in the grains. (3) The process of sintering and HIP better control densification and grain growth mechanism. (4) texture-free powder technology to produce products. (5) at different strain rates, the powder product of the flow stress is much larger than those for processing. (6) the strain hardening behavior of powder products similar with forging products. (James Chiu mussels) tungsten powder particle size and copper content on the W-Cu electrode in the behavior of EDM Tainan Institute of Technology, China Taiwan recently w-C1I electrode materials and W-cu in the conduct of EDM studied. With average particle size (I was 1-01.5.2.0,2.5,3.0 five kinds of tungsten powder production samples,[link widoczny dla zalogowanych], more than 98.9% purity tungsten powder. Sample production process to: The solution mixture of gasoline over the pages of paraffin tablets in lo0MPa ~ 8o0MPa a molding under the pressure of one in 300 ℃ ~ 400 ℃ in hydrogen under dewaxing a sintering furnace at ll50 ℃ 40r ~ n, hydrogen gas dew point is a one with a 25 ℃ 100 where the purpose of atomizing copper in the steel pressed into pellets, tungsten billet for fear of Cu. time is 30min, the same as other conditions and sintering. measured copper tungsten skeleton and timing of the w-Cu material after the volume contraction observed significant emblem of organization, and then use W-C'u samples of Fe-1.5 (2-0.4Sj-O.5Mn-l1.8Cr-1.2Mo 0.4V touch with a hard steel and 8OwC20Co Taijin for electrical discharge machining, machining current of 9 voltage of 220,,. kerosene for insulation stains. embarrassed when measured erosion process than that w-Cu electrode weight loss / weight loss of workpiece, also measured corrosion rate by the workpiece. The results show that the pressure {prince Yu W green density with compaction pressure and the increase of average particle size of tungsten powder increases with increasing the volume of sintered tungsten blanks play things close with the pressing pressure is increased and tungsten powder particle size decreases the average, granted after the w-Cu copper material shrinkage and sintered the same thing with the contraction of law. with a volume ratio of 70W30Cu EDM die steel materials, the electrode wear minimal ,[link widoczny dla zalogowanych], touch a steel cavity size can remain the same, that is a very high accuracy, can maintain close cooperation. corrosion of processing all samples were less than than 1.5%. by the loss of more than l10mg processing speed things / min. 80WC20Co hard Taijin processing time 5
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