爆薬によつて成型した金属酸化物の二,三の性質

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概要

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• A very dense form is produced when metallic oxide powders are formed by explosives. In this study, basic research on the method of explosive forming of metallic oxides was carried on while measuring a few properties of the formed samples and these were compared with properties of sample produced by static pressure. The explosive used in this experiment was T.N.T. and its form is shown in Table (1). Metallic mould used for forming samples is as shown in Fig. 1 and the metallic mould and explosive were arranged as shown in Fig. 2. The followings were made clear as a result of a few measurements made on samples produced by explosive forming.<BR>(1). The surface hardness Hv of ZnO+Fe<SUB>2</SUB>O<SUB>3</SUB> sample after forming is as shown in Table (2). The micro-Vickers hardness Hv of sample formed by 360kg/cm<SUP>2</SUP> static pressu-re was 3.16 while the Hv of sample formed by using 30g of T.N.T. was 20.9.<BR>(2). The density of Zn-ferrite raw material used for forming (diameter of piston used for forming was 10mm) by using 30g of T.N.T. was 3.8-4.2g/cc, which corresponds to a density of 70-80% of Zn-ferrite (Fig. 3).<BR>(3). Of the moulds used after explosive forming, there was entirely no damage to the press cylinder in which sample was placed. However, the piston was damaged as shown in Fig. 4 and Fig. 5. The shock absorbing plate was destroyed by the detonation (Fig. 4, 6, 7, 8).<BR>(4). The expansion-contraction characteristics when mixture of ZnO and Fe<SUB>2</SUB>O<SUB>3</SUB>, and also when CdO and Fe<SUB>2</SUB>O<SUB>3</SUB> were formed were measured. With regards to expansion-contraction characteristics of Zn-ferrite and Cd-ferrite formed by using 30g of T.N.T., expansion at high temperature was 1-2% greater and the rate of contraction at 1400°C was approximately 10% less (Fig. 9) than those formed by static pressure.<BR>(5). With regards to microscopic structure, the number of pores in samples formed by using 30g of T.N.T. was larger than those formed by static pressure and the shape was small. Another feature of this method is that there are small, long pores parallel with the detonated surface, as can be seen in Fig. 10.

• 社団法人 粉体粉末冶金協会の論文

著者

• 木村 康之

  防衛大学校

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• 爆薬によつて成型した金属酸化物の二,三の性質

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