The transport of heat energy through the solid body of the material is described by two properties, thermal diffusivity D and thermal conductivity κ. Thermal diffusivity pertains to transient heat flow, while thermal conductivity pertains to steady-state heat flow. The two properties are related such that κ = ρCPD, where ρ and Cp are the density and specific heat, respectively. Data on the thermal transport properties of TiB2 are very scarce. Thermal diffusivity data was obtained using the laser flash technique for two batches of TiB2. The higher-density material with the smaller grain size also has a small nickel impurity (mass fraction of 0.43 %) which is not present in the other material. While it may be anticipated that these various factors may influence the diffusivity, there is insufficient data to discern any distinct effects at present. The diffusivity data can be converted to thermal conductivity data (filled symbols) using the results already given for density and specific heat. For each of these thermal transport properties, it is convenient to represent the values of the properties by an interpolation formula. For thermal diffusivity, there is no de facto production standard for TiB2.
Consequently, the variability of property values among different batches can be expected to be significant. However, trends in property values are related to the microstructure statistics. That relation can be exploited to determine a consistent set of trend values for the properties of TiB2. Such trend values have been determined in the present work, focusing on a particular density, ρ = (4.5±0.1) g/cm3, and mean grain size, g = (9±1) μm, as a function of temperature. About the author: Ronald G. Munro is a physicist in the NIST Ceramics Division of the Materials Science and Engineering Laboratory. The National Institute of Standards and Technology is an agency of the Technology Administration, U.S. Department of Commerce. If you are looking for high quality, high purity, and cost-effective Titanium diboride, or if you require the latest price of Titanium diboride, please feel free to email contact mis-asia.
