Special molybdenum powder used for automatic forming and preparation method thereof

Abstract

The invention discloses a special molybdenum powder which is directly used for the automatic forming of precision devices of the machinery industry and the electronic industry. The invention is characterized in that the molybdenum powder comprises the following materials according to the parts by mass: 96.6-99.5 parts of primary molybdenum powder, 0.5-2.4 parts of polyvinyl alcohol, 0-0.4 part of polyethylene glycol, 0-0.5 part of metallic stearate and 0-0.15 part of ammonium polyacrylate. The molybdenum powder has good flowability, high apparent density and appropriate particle size distribution and has the self-lubricating action in the process of the automatic forming. The invention also discloses a preparation method of the special molybdenum powder, which comprises the processes: (1) forming agent solution is prepared by the polyvinyl alcohol, the polyethylene glycol, water and other additives; (2) wet grinding is carried out on the primary molybdenum powder, metallic balls and the forming agent solution by proportion in a ball milling tank to prepare molybdenum powder slurry; (3) spray drying is carried out on the prepared molybdenum powder slurry for granulation; (4) the prepared molybdenum powder is collected by a vibrating screen arranged at the discharge hole of a spray drying tower. The preparation method has the greatest advantages of the special molybdenum powder used for the automatic forming can be prepared by one step, the efficiency is high, the cost is low, and the industrialization and no pollution can be realized.

Description

technical field

[0001] A special molybdenum powder prepared by a one-step method relates to a special molybdenum powder for automatic molding of precision devices in the machinery and electronic industries and a preparation method thereof. Background technique

[0002] Powder metallurgy is an effective method for the production of precision metal devices in the machinery and electronics industries. Its advantages lie in the wear resistance, durability, high precision and low noise of the produced devices. It is suitable for various parts with complex shapes and difficult machining. At the same time, it can also save metal materials, reduce the amount of cutting processing, improve labor productivity, save production costs, reduce production costs, and improve production competitiveness. Fully automatic compression molding is a typical forming method of powder metallurgy. This method has high requirements on the particle size, fluidity and particle size distribution of the po...

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