1. Composition and physical properties: titanium powder is a gray powder, its chemical formula is Ti, the main component is titanium metal. And calcium powder is a white powder, its chemical formula is Ca, the main component is calcium metal. Titanium powder does not react with general acid and alkali at room temperature, and it is flammable at high temperature, while calcium powder easily reacts to generate hydrogen gas when it meets water.

2. Use: Titanium powder is widely used in the manufacture of space shuttles, rockets and missiles, submarines, chemical equipment, medical equipment, artificial joints, etc., but also used in the production of titanium dioxide. Calcium powder is used in industry as an additive for various metal materials, such as titanium-iron alloy, titanium-aluminum alloy, as well as powder metallurgy, filters, and the manufacture of machine and equipment parts. In addition, calcium powder is also used in the production of fireworks, medical equipment and other industries.