5results about How to "Reduce oxygenation" patented technology

The invention discloses a method for reducing the content of arsenic and tin in a nickel-based alloy material. The method specifically comprises the following steps: adopting pre-melted slag comprising the following components in an electroslag remelting procedure in the preparation process of the nickel-based alloy material: 38%-45% of CaF2, 20%-25% of CaO, 20%-30% of Al2O3, 3%-5% of ZrO2, 3%-5% of BaF2, 1%-3% of MgO, 1%-3% of SiO2 and the balance of inevitable impurities; the ratio of CaO to Al2O3 in the pre-melted slag is 0.8-1; and calcium carbide powder accounting for 1-1.5% of the total amount of the pre-melted slag is also prepared in the pre-melted slag. By the adoption of the method, the removal rate of arsenic and tin in the nickel-based alloy material can reach 46% or above, the problem that arsenic and tin in the nickel-based alloy material are difficult to remove is well solved, the influence of accumulation of As and Sn on the product quality in the recycling process is avoided, and conditions are created for recycling of the nickel-based alloy return scrap.

The invention belongs to the technical field of powder preparation, and particularly relates to fine spherical titanium or titanium alloy powder and a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: (1) carrying out vacuum-pumping treatment on atomization powder preparation equipment, and then filling inert gas into the atomization powder preparation equipment; (2) the two raw material wires are connected with the positive electrode and the negative electrode of an arc power source respectively and then enter a guide pipe through a wire feeding device, a raw material wire contact point is formed at the outlet end of the guide pipe, and arc molten liquid drops are generated; the raw material wire is a titanium or titanium alloy wire; and (3) atomizing the electric arc molten liquid drops obtained in the step (2) through at least two paths of atomizing airflow to obtain the fine spherical titanium or titanium alloy powder, wherein airflow of the air inlet valve intersects to form an airflow focus which is concentrated at the same point with the raw material wire contact point in the step 2); and 4) screening the atomized powder obtained in the step 3). According to the method, the atomization efficiency can be improved, the yield of the titanium or titanium alloy powder is increased, and the cost is low.

This invention relates to a method for identifying the magnetic properties of a mixture of tungsten carbide powder and cobalt powder. The method includes the following steps: (1) sampling the mixture of tungsten carbide powder and cobalt powder and sealing and storing the sample; (2) preparing the sealed sample into an identification compact, storing the compact in a fixed environment until the expiration date, then placing it in a graphite boat and sintering it together with a large batch of products; (3) testing the magnetic properties of the sintered identification compact. The identification method simulates the actual production cycle to the greatest extent possible. The graphite boat isolates the sample from atmospheric influences without causing carbon buildup, and the identification results can reliably guide large-scale production.

The invention belongs to the technical field of casting, and particularly relates to a die casting protection casting device and a using method thereof. The die casting protection casting device is connected to a ladle nozzle in a sealed mode and comprises an upper sealing assembly, a lower sealing assembly and an adjusting device, and the upper sealing assembly and the lower sealing assembly are connected in a sealed and pressed mode. The adjusting device is connected to the steel ladle casting vehicle and connected with the upper sealing assembly. A ladle nozzle and a molten steel flowing area are wrapped, non-oxidation protection in the whole casting process is achieved, and the casting blank quality is improved.

The invention discloses a method for preparing low-oxygen titanium powder through a hydrogenation dehydrogenation method and the titanium powder, relates to the technical field of titanium powder preparation, and can solve the problems that the titanium powder production efficiency is low and oxygenation is serious due to the fact that the dehydrogenation process is low in efficiency and powder caking is difficult to crush. The method comprises the following steps: putting sponge titanium into a hydrogenation furnace, and carrying out hydrogenation treatment on the sponge titanium in a hydrogen atmosphere to obtain a titanium hydride material; crushing the titanium hydride material by using a vacuum crushing and screening machine to obtain titanium hydride powder; the titanium hydride powder and a hydrogen absorption catalyst are put into a dehydrogenation furnace for dehydrogenation treatment, and pure titanium powder is obtained; and the pure titanium powder is put into a vacuum crushing and screening machine to be subjected to screening and grading treatment, and the low-oxygen titanium powder is obtained.