The reason for sedimentation in graphite emulsion
Graphite is increasingly being used across a wide range of industries. Graphite emulsion, on the other hand, is a high-purity natural flake graphite powder combined with an appropriate amount of additives and water, and formulated through a special process into a colloidal graphite lubricant. It is a colloidal suspension in which solid particles are dispersed in a liquid; during transportation and storage, sedimentation may occur.
Method for determining the solid content of forging lubricants:
1. After thoroughly mixing the sample, weigh 1–2 g and place it onto a pre-dried, constant-weight glass petri dish or porcelain crucible.
2. Place it in a drying oven and dry at a constant temperature of 105–110℃ for 2 hours.
3. After the sample has been dried, place it into a desiccator, allow it to cool to room temperature, and then weigh it last.
One of the key raw materials for graphite emulsion is natural flake graphite. It determines the high-temperature adhesion, demolding performance, corrosion resistance, non-toxicity, stability, and lubricity of forging lubricants.
Generally, forging lubricants made from high-quality raw materials can prevent sticking, thereby extending the service life of dies and molds, improving the surface finish of products, and shortening production time. In other words, graphite emulsions can enhance the service life of molds and the quality of forged parts, reduce the cost of die-forged components, and deliver significant economic benefits.
However, as the price of natural flake graphite has risen significantly in recent times, many unscrupulous merchants have started using low-purity graphite powder—specifically, substandard graphite powder (i.e., scrap material from spherical graphite)—to produce graphite emulsions. This has led to the phenomenon of graphite emulsion deposition.
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