Graphite Powder Density and Physical Properties
Graphite powder has long been used as a dry lubricant. It offers excellent electrical conductivity and thermal shock resistance. This conductive material is commonly used in powder metallurgy, paint, and lubricants. Using graphite powder can improve price and performance, and it can also improve dimensional tolerances and stability.
Graphite is a crystalline form of carbon. It occurs naturally in a hexagonal structure. Normally, graphite is produced from underground methods. The type of graphite used depends on its properties. Typical uses for graphite powder include lubricants, electrodes, and fertilizers.
During the late 1980s and early 1990s, graphite demand grew due to portable electronics. Graphite was also used for early F-117 Nighthawk stealth fighters. A lithium-ion battery in the Nissan Leaf contains 40 kg of graphite. Moreover, the demand for batteries has increased since the introduction of smartphones.
During the 2000s, the US refractory industry experienced a decline in production and a number of plants shut down. Many of these plant closures were triggered by the Harbison-Walker Refractories acquisition by RHI AG. In addition, the US refractory industry went through a crisis in the years 2000-2003.
Several studies have been conducted to investigate the physical properties of graphitized GBs. The bulk density, flexural strength, thermal conductivity, and apparent density were studied. Various pitch contents were also evaluated. Pitch binder content was found to increase the porosity and mechanical strength of GBs.
Optimal bulk density was achieved when the GF ratio was constant, while the apparent density was influenced by the mean size of GFs. Small-sized GFs, with high specific surface areas, are expected to have more voids and to reduce the porosity of GBs. However, they are also more expensive.
