Rose Gold – Material Table – Applications – Price

About Rose Gold

Pure gold is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. It is one of the least reactive chemical elements and is solid under standard conditions. Gold is thought to have been produced in supernova nucleosynthesis, from the collision of neutron stars. Rose gold is a gold–copper alloy widely used for specialized jewelry.

Summary

Name	Rose Gold
Phase at STP	solid
Density	12900 kg/m3
Ultimate Tensile Strength	550 MPa
Yield Strength	N/A
Young’s Modulus of Elasticity	77 GPa
Brinell Hardness	150 BHN
Melting Point	897 °C
Thermal Conductivity	300 W/mK
Heat Capacity	230 J/g K
Price	30000 $/kg

Composition of Rose Gold

Although the names rose gold and pink gold are often used interchangeably, the difference between red, rose, and pink gold is the copper content: the higher the copper content, the stronger the red coloration. Examples of the common alloys for 18K rose gold, 18K red gold, 18K pink gold, and 12K red gold include: 18K red gold: 75% gold, 25% copper; 18K rose gold: 75% gold, 22.25% copper, 2.75% silver; 18K pink gold: 75% gold, 20% copper, 5% silver and 12K red gold: 50% gold and 50% copper.

Applications of Rose Gold

Gold is used extensively in jewellery, either in its pure form or as an alloy. About 75% of all gold produced is used in the jewelry industry. Pure gold is too soft to stand up to the stresses applied to many jewelry items. Craftsmen learned that alloying gold with other metals such as copper, silver, and platinum would increase its durability and it also changes its color. The term ‘carat’ indicates the amount of gold present in an alloy. 24-carat is pure gold, but it is very soft. 18- and 9-carat gold alloys are commonly used because they are more durable.

Mechanical Properties of Rose Gold

Strength of Rose Gold

In mechanics of materials, the strength of a material is its ability to withstand an applied load without failure or plastic deformation. Strength of materials basically considers the relationship between the external loads applied to a material and the resulting deformation or change in material dimensions. In designing structures and machines, it is important to consider these factors, in order that the material selected will have adequate strength to resist applied loads or forces and retain its original shape.

Strength of a material is its ability to withstand this applied load without failure or plastic deformation. For tensile stress, the capacity of a material or structure to withstand loads tending to elongate is known as ultimate tensile strength (UTS). Yield strength or yield stress is the material property defined as the stress at which a material begins to deform plastically whereas yield point is the point where nonlinear (elastic + plastic) deformation begins. In case of tensional stress of a uniform bar (stress-strain curve), the Hooke’s law describes behaviour of a bar in the elastic region. The Young’s modulus of elasticity is the elastic modulus for tensile and compressive stress in the linear elasticity regime of a uniaxial deformation and is usually assessed by tensile tests.

See also: Strength of Materials

Ultimate Tensile Strength of Rose Gold

Ultimate tensile strength of Rose Gold is 550 MPa.

Yield Strength of Rose Gold

Yield strength of Rose Gold is N/A.

Modulus of Elasticity of Rose Gold

The Young’s modulus of elasticity of Rose Gold is 77 GPa.

Hardness of Rose Gold

In materials science, hardness is the ability to withstand surface indentation (localized plastic deformation) and scratching. Brinell hardness test is one of indentation hardness tests, that has been developed for hardness testing. In Brinell tests, a hard, spherical indenter is forced under a specific load into the surface of the metal to be tested.

The Brinell hardness number (HB) is the load divided by the surface area of the indentation. The diameter of the impression is measured with a microscope with a superimposed scale. The Brinell hardness number is computed from the equation:

Brinell hardness of Rose Gold is approximately 150 BHN(converted).

See also: Hardness of Materials

Thermal Properties of Rose Gold

Rose Gold – Melting Point

Melting point of Rose Gold is 897 °C.

Note that, these points are associated with the standard atmospheric pressure. In general, melting is a phase change of a substance from the solid to the liquid phase. The melting point of a substance is the temperature at which this phase change occurs. The melting point also defines a condition in which the solid and liquid can exist in equilibrium. For various chemical compounds and alloys, it is difficult to define the melting point, since they are usually a mixture of various chemical elements.

Rose Gold – Thermal Conductivity

Thermal conductivity of Rose Gold is 300 W/(m·K).

The heat transfer characteristics of a solid material are measured by a property called the thermal conductivity, k (or λ), measured in W/m.K. It is a measure of a substance’s ability to transfer heat through a material by conduction. Note that Fourier’s law applies for all matter, regardless of its state (solid, liquid, or gas), therefore, it is also defined for liquids and gases.

The thermal conductivity of most liquids and solids varies with temperature. For vapors, it also depends upon pressure. In general:

Most materials are very nearly homogeneous, therefore we can usually write k = k (T). Similar definitions are associated with thermal conductivities in the y- and z-directions (ky, kz), but for an isotropic material the thermal conductivity is independent of the direction of transfer, kx = ky = kz = k.

Rose Gold – Specific Heat

Specific heat of Rose Gold is 230 J/g K.

Specific heat, or specific heat capacity, is a property related to internal energy that is very important in thermodynamics. The intensive properties c_v and c_p are defined for pure, simple compressible substances as partial derivatives of the internal energy u(T, v) and enthalpy h(T, p), respectively:

where the subscripts v and p denote the variables held fixed during differentiation. The properties c_v and c_p are referred to as specific heats (or heat capacities) because under certain special conditions they relate the temperature change of a system to the amount of energy added by heat transfer. Their SI units are J/kg K or J/mol K.

Properties and prices of other materials

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