字幕表 動画を再生する 英語字幕をプリント Hello Everyone Today, I want to tell you about the most durable metal on Earth. Titanium In the periodic table of chemical elements, Titanium is in the forth group, located after Scandium. In nature, this element is found in the composition of minerals. Such as titanite and rutile. Pure titanium usually is slivery grey. And is lightweight metal. With the highest ratio of strength-to-weight of all the elements. This means the blade made of titanium will weight 50% less than the one made of steel. Too, it will have the same strength and might be even stronger. To demonstrate the physical properties of titanium, I will first try to compare with the grinder cut on the titanium plate in comparison to steel. The steel plate is being cut pretty much as usual. Without any problems. However, when I start to cut the titanium plate, you could instantly notice the main difference - the colour of the sparks. This is because titanium (like iron) has the property of powerful resistance. This means, the small titanium particles created during this (shavings) can self-ignite in air. Forming bright white sparks. These sparks are much hotter than those formed by the shavings of steel. Hence, are an increase in fire hazards. Titanium powder generally burns in air extremely well. Forming bright sparks. This property of titanium is often used in pyrotechnics. For example, for creating bright pyrotechnical fountains. In the industry, titanium is often being cut with special cutters. To avoid sparks and reduce the fire hazardness. Also, sawing titanium with a grinder is a much worst experience than sawing steel.