White Gold – Material Table – Applications – Price

About White 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. White gold is a gold–silver (or nickel or palladium) alloy widely used for specialized jewelry.

white gold properties density strength price

Summary

Name White Gold
Phase at STP solid
Density 15900 kg/m3
Ultimate Tensile Strength 350 MPa
Yield Strength N/A
Young’s Modulus of Elasticity 75 GPa
Brinell Hardness 100 BHN
Melting Point 937 °C
Thermal Conductivity 250 W/mK
Heat Capacity 220 J/g K
Price 45000 $/kg

Composition of White Gold

Examples of the common alloys for 18K white gold include: 18K white gold: 75% gold, 25% of palladium or platinum and 18K white gold: 75% gold, 10% palladium, 10% nickel and 5% zinc .A common white gold formulation also consists of 90 wt.% gold and 10 wt.% nickel. Copper can be added to increase malleability. The alloys used in the jewelry industry are gold–palladium–silver and gold–nickel–copper–zinc. Palladium and nickel act as primary bleaching agents for gold; zinc acts as a secondary bleaching agent to attenuate the color of copper.

75%Gold in Periodic Table

10%Palladium in Periodic Table

10%Nickel in Periodic Table

Applications of White Gold

White Gold - Material Table - Applications - Price
Source: wikipedia.org License: CC-BY SA 3.0

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. White gold’s properties vary depending on the metals used and their proportions. As a result, white gold alloys can be used for many different purposes; while a nickel alloy is hard and strong, and, therefore, good for rings and pins, gold–palladium alloys are soft, pliable, and good for white gold gemstone settings.

Mechanical Properties of White Gold

Strength of White 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 White Gold

Ultimate tensile strength of White Gold is 350 MPa.

Yield Strength of White Gold

Yield strength of White Gold is N/A.

Modulus of Elasticity of White Gold

The Young’s modulus of elasticity of White Gold is 75 GPa.

Hardness of White Gold

In materials science, hardness is the ability to withstand surface indentation (localized plastic deformation) and scratchingBrinell 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 number - definition

Brinell hardness of White Gold is approximately 100 BHN(converted).

See also: Hardness of Materials

Strength of Materials

Material Table - Strength of Materials

Elasticity of Materials

Material Table - Elasticity of Materials

Hardness of Materials

Material Table - Hardness of Materials  

Thermal Properties of White Gold

White Gold – Melting Point

Melting point of White Gold is 937 °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.

White Gold – Thermal Conductivity

Thermal conductivity of White Gold is 250 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:

thermal conductivity - definition

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.

White Gold – Specific Heat

Specific heat of White Gold is 220 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 cv and cp 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 cv and cp 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.

Melting Point of Materials

Material Table - Melting Point

Thermal Conductivity of Materials

Material Table - Thermal Conductivity

Heat Capacity of Materials

Material Table - Heat Capacity

Properties and prices of other materials

material-table-in-8k-resolution