Method for preparing tungsten-nickel hard alloy

Abstract

The invention discloses a method for preparing a tungsten-nickel hard alloy. The method comprises the following steps of: preparing the following raw materials in percentage by weight: 90 percent of WC powder, 9.6 percent of Ni powder and 0.4 percent of Cr3C2 powder; after performing ball-milling on the raw materials for 36 hours, cutting and precipitating for 24 hours; drying for 100 + / -5 minutes; controlling the temperature to be 85+ / -5 DEG C; blending glue by adding 10ml of the glue into per kilogram of mixed raw materials; doping a forming agent SBS by adding 0.1Kg of the forming agent SBS into per kilogram of the mixed raw materials; pressing and forming; sintering the mixed materials by using a vacuum furnace; controlling the temperature to be raised to 1,450 DEG C from 300 DEG C; cooling to normal temperature; and discharging a product out of the furnace. Due to the adoption of the method, a material has improved acid and alkali resistance but no magnetism and is suitable to be used for producing a movement axis of an acid-alkali flow instrument and the movement axis of an instrument and a meter needing avoiding magnetic interference.

Description

technical field [0001] The invention relates to a preparation method of a tungsten-nickel hard alloy, which can be applied to the core shaft of an acid-base flow meter and the core shaft of an instrument that needs to avoid magnetic interference. Background technique [0002] The flow shaft in the existing liquid pump is used to measure the flow and speed of the liquid when it flows. Typically, flow shafts are made of stainless steel. It is well known that stainless steel has good corrosion resistance. The corrosion resistance of stainless steel depends on the alloying elements contained in the steel. Chromium is the basic element for stainless steel to obtain corrosion resistance. When the chromium content in the steel reaches about 1.2%, the chromium and the corrosive medium will oxidize and form a thin oxide film on the steel surface, which can prevent the steel matrix from further corrosion. corrosion. In addition to chromium, commonly used alloying elements include ...

AI Technical Summary

Problems solved by technology

However, it will still be corroded if exposed to chemical substances such as strong acid and strong alkali for a long time.

Therefore, the existing flow axis cannot accurately measure the flow of acidic and alkaline liquids, and the service life is also limited

[0004] In addition, other alloying elements are added to stainless steel, which makes the steel material impure, so that there will be deviation when encountering magnetism, resulting in inaccurate measurement