6 results about "Tantalum" patented technology

The invention relates to a short-process non-consumable arc melting preparation method of a high-density and high-melting-point tungsten alloy. According to the invention, W powder with an average particle size of 3-5 micrometers and tantalum powder with an average particle size of 5 micrometers are uniformly mixed according to designed components and then are put into a cold isostatic pressing sheath, and a prefabricated block is obtained through cold isostatic pressing forming; the cold isostatic pressing process conditions comprise the steps that firstly, the cold isostatic pressing pressure is gradually increased to 250 MPa and kept, then, the cold isostatic pressing pressure is gradually reduced to 160 MPa at the speed of 18 MPa/min and kept for 2 min, and finally, the pressure is reduced to normal pressure from 160 MPa at the speed of 10 MPa/min; and finally, high-density and high-melting-point tungsten alloy or pure tungsten is obtained through non-consumable electric arc melting. The block-shaped green body with strong binding force is prepared by adopting cold isostatic pressing in one step, and a compact product with uniform components is obtained by combining a subsequent process. The preparation process is simple and controllable, the obtained product is excellent in performance, and large-scale industrial application is facilitated.

The invention relates to the technical field of mineral separation, in particular to a comprehensive utilization method of pegmatite containing tantalum, niobium, cassiterite, feldspar and spodumene. The comprehensive utilization method of the pegmatite comprises the following steps: crushing and grinding raw ore, and then carrying out flotation, magnetic separation, reselection, concentration, dehydration, precipitation and clarification combined mineral separation process, so that valuable mineral resources such as mica, tantalum-niobium ore, cassiterite, feldspar, spodumene, building material sand and the like contained in the pegmatite can be recycled; the method has the advantages that the method is simple in process, high-quality recovery of spodumene concentrate and feldspar concentrate products and the like can be achieved, the comprehensive recovery utilization rate is high, nearly zero emission of tailings and tail water can be achieved, the method is suitable for large-scale production and application, and stable beneficiation indexes can be kept.

The invention discloses an intermediate layer alloy applied to resistance spot-welding of tantalum Ta1 and Q235 and a preparation method thereof. The intermediate layer alloy is prepared from the components in percentage by atom: 5%-10% of Ta, 5%-10% of Fe, 20%-25% of Ni, 15%-23% of Cr, 15%-22% of Cu, 20%-25% of Co, and the total atom percentage of the components is 100%. A certain thickness of intermediate layer alloy foil is placed between Ta1 and Q235 sheets to be welded, resistance spot-welding is used for welding operation to enable the intermediate layer alloy and partial base metal aresubjected to heat fusing by interface resistance, and the high performance welding of Ta1/Q235 is realized. According to the method and the intermediate layer alloy thereof, the matching between tantalum and stainless steel during welding is good, a single phase Fcc solid solution structure is used as nugget, joint comprehensive mechanical properties are remarkably improved, and the preparation method of the intermediate layer alloy foil is simple in process and low in cost.

Molybdenum oxide is doped with vanadium, nobidium, tantalum or titanium to form a stable M₅O₁₄ theta phase crystal structure as a vapor sensitive material for detecting vapors of volatile organic compounds. That material is used between electrodes connected to a measuring device to measure a change in an electrical quality in the presence of a vapor of a volatile organic compound. Concentration of the vapor is measured to low part per million ranges.

The invention discloses a method and a device for manufacturing a semi-hard or soft tantalum wire. The device comprises an unwinding device, an annealing device and a winding device; the unwinding device comprises unwinding wheels and guide wheels located at an inlet of the annealing device; the winding device comprises winding wheels and guide wheels located at an outlet of the annealing device;the annealing device comprises an upper guide box, a heat insulation box and a lower guide box sequentially from top to bottom; inner guide pipes are arranged inside the upper guide box and the lowerguide box; and a lifting cabinet type heater is arranged inside the heat insulation box and comprises guide columns, upper fixed connection blocks, resistance wires and lower fixing plates from top tobottom. The invention further discloses the method for manufacturing the tantalum wire. The tantalum wire is annealed inside the heater at the temperature ranging from 1,150 DEG C to 1,250 DEG C, winding is performed while unwinding, and the hard tantalum wire can be changed into the semi-hard or soft tantalum wire according to the different winding speeds. By the aid of the device and the method, straightening can be avoided after annealing of the tantalum wire, double purposes can be achieved through one effort, and thus the production efficiency is high.