Catalytic debinding furnace taking oxalic acid as catalyst and catalytic debinding method

Abstract

Disclosed are a catalytic debinding furnace taking oxalic acid as a catalyst and a catalytic debinding method. The catalytic debinding furnace comprises a furnace body and a feeding machine for conveying the oxalic acid into the furnace body. A debinding furnace pipe for holding materials is located inside the furnace body. The debinding furnace pipe is connected with the feeding machine through a heat-resisting pipeline. A heating tank for introducing nitrogen and a storage tank for holding the oxalic acid are arranged inside the feeding machine. The heating tank is used for heating the oxalic acid so that the oxalic acid can be gasified. The gasified oxalic acid and the nitrogen flow into the debinding furnace pipe together to participate in a catalytic reaction. The debinding furnace pipe is connected with a combustion chamber located above the furnace body through an exhaust pipeline, the combustion chamber is provided with a gas inlet and a gas exhaust port, natural gas is introduced into the combustion chamber through the gas inlet so that decomposition products of the oxalic acid can be combusted, and water vapor, carbon dioxide and waste gas in the furnace body are exhausted through the gas exhaust port. Through the catalytic debinding furnace taking the oxalic acid as the catalyst and the catalytic debinding method, the product yield can be increased; and besides, tail gas only contains CO2 and H2O, and thus the standard of environment-friendly emission is reached.

Description

technical field [0001] The invention belongs to the field of metal powder injection molding, and in particular relates to a catalytic degreasing furnace and a catalytic degreasing method using oxalic acid as a catalyst. Background technique [0002] Metal powder injection molding is a metal net shape process that mixes metal powder with a certain proportion of binder and injects it into a mold with an injection molding machine to obtain a product of a certain shape. [0003] After green body injection molding, the green body consists of metal powder and a binder, which needs to be removed before sintering to obtain a complete metal phase. [0004] The main component of the adhesive is polyoxymethylene POM (accounting for 70-95%), and other components are materials with high melting point and good heat and oxygen resistance, such as PP and PE. [0005] The process of metal powder injection molding degreasing, the most important thing is to remove polyoxymethylene (POM), beca...

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Problems solved by technology

[0011] 2. Nitric acid is easy to oxidize the workpiece, resulting in surface oxidation of the workpiece;

[0017] Therefore, it is not conducive to the application of catalytic degreasing technology to these metal powders that are easily oxidized by HNO3

[0018] 3. The danger of nitric acid;

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