The scale shown in the micrographs is used as reference, and particles are measured. The high crystallinity of the hexagonal boron nitride obtained by the production method of this embodiment is confirmed by using the Graphitization Index GI , which is an index for the crystallinity in powder X-ray diffractometry. The GI is obtained by calculating the integrated intensity ratio, i. Thomas, et. The smaller the value of GI is, the higher the crystallinity is. The GI of the hexagonal boron nitride obtained by the production method of this embodiment is, for example, 6 or less.
When the GI is above 6, excellent properties such as thermal conductance, chemical stability, solid lubricity, thermal shock resistance and electrical insulation property cannot be exhibited in some cases.
Tatortreiniger & Leichenfundortreiniger
Thus, it may not be suitable in applications where these properties are required. As a pre-treatment for the measurement, the prepared hexagonal boron nitride is disaggregated into a powder. Using this powder, powder X-ray diffraction measurement is performed under the following conditions. The qualitative analysis of the product can also be performed under the same conditions.
Note that when the sample comprises components other than hexagonal boron nitride, the components are removed by performing acid wash, water washing, and drying treatment before the measurement.
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The production method of this embodiment is as in the 1 below. The production method of this embodiment has an effect of efficiently obtaining a high-crystalline hexagonal boron nitride powder. That is, the applications of hexagonal boron nitride are, for example, in the above compositions.
The above compositions will be described below. The resin composition contains at least one of the resins mentioned below.
The resin composition may contain a curing agent. Examples of the curing agent for epoxy resins include phenol type curing agents such as phenol novolac or cresol novolac, or acid anhydride type curing agents such as tetrahydrophthalic anhydride, hexahydrophthalic anhydride or methylhexahydrophthalic anhydride. The amount used is preferably parts by mass based on parts by mass of epoxy resins. The rubber composition may comprise natural rubber or synthetic rubber.