Is the alloy 999 gold?

The alloy is not 999 gold, but two or more metals or nonmetals mixed and melted. 999 gold is pure gold with a gold content of not less than 99.9%. Alloys can form solid solutions and compounds, and produce endothermic or exothermic reactions, and most alloys have no fixed melting point, so the melting point of alloys is lower than that of constituent metals.

The alloy is neither 999 gold alloy nor 999 gold. Alloy refers to a mixed metal with metallic characteristics, which is formed by mixing and melting two or more metals or metals or nonmetals. 999 gold refers to thousands of pure gold with a gold content of not less than 99.9%, which is the highest value of jewelry color naming in the national standard.

Alloys are divided into binary alloys, ternary alloys and multicomponent alloys according to the number of elements, so alloys are not mixed metals in general concept, and are essentially different from pure metals. Alloys can form solid solutions and compounds and produce endothermic or exothermic reactions because they change the properties of metal matrix.

Unlike pure metals, most alloys have no fixed melting point. If the temperature of the alloy is within the melting temperature range, the mixture is in a state of solid-liquid coexistence. From this point of view, the melting point of the alloy is lower than that of the constituent metals, and the electrical conductivity and thermal conductivity of the alloy are lower than that of any constituent metals, but the hardness is generally higher than that of any constituent metals.