1. Precious metals
Platinum is a rare and expensive natural pure white metal. It is one of the rarest precious metals for jewelry in the world. Its annual supply is only 5% of gold. It has almost twice the strength of gold and is 30 times rarer than gold. Platinum is white in luster, natural and pure, with a purity of more than 90%. It is natural and will not fade when worn frequently. Pt900 refers to platinum jewelry with a purity of 90%, and Pt950 refers to platinum jewelry with a purity of 95%.
K gold refers to an alloy in which gold and other metals are mixed together. Because its English name is Karat Gold, it is called K gold for short. For the precious metal part, pure gold is 24K, but pure gold is too soft and not suitable for making watches. It must be mixed with other metals to enhance the hardness. Generally silver, copper and palladium are the main ones, but no matter what kind of metal is mixed, the proportion of pure gold is 75% . With the ratio of gold, silver and copper, five different color materials can be produced. N is used to indicate the copper content. For example, red gold with the highest copper content is represented by 5N, while the correct term for platinum is white. K gold.
Silver is an ancient precious metal. It is the most used material for pocket watches in the eighteenth century and before. 925 represents the purity of silver and is the highest purity of silver. Spend. Silver is an active metal that easily reacts with sulfur in the air, and a black oxide layer appears, which makes silverware black. Nowadays, it is far inferior to gold in watch applications. The reason is that it can easily lose its luster due to water, moisture and other reasons.
2. Other metal materials
(1) Half gold
Half gold is a combination of stainless steel and 18K gold materials, presenting a unique two-tone beauty.
Its case is made of stainless steel, wrapped with a layer of gold alloy, and mechanically rolled into a whole. Its thickness is measured in micrometers, and 1 micrometer is equal to 1/1000mm. The maximum thickness is 10 to 15 microns, and generally only 2 to 3 microns.
(3) Plating Electroplating
Plating Electroplating is a common case decoration method in modern watches. Electroplating technology emerged in the 1970s. Because electroplating is uniform and firm, it is less expensive than gold coating and not easy to fall off, and there is no possibility of discoloration or rusting of forged yellow cases. They are eliminated from the market.
In the watch, copper is the best thing, it is cheap, and the characteristic is very easy to process, it is mainly used in the movement, most of the movement currently uses brass alloy plywood. Usually the colors of the movement we see are yellow and white, the yellow movement is usually titanium oxide plated.The white movement is galvanized nickel alloy .
Steel: a compound of chromium and nickel
Stainless steel: a compound of chromium and nickel
Stainless steel: difficult to process, corrosion resistance and wear resistance are better than the former, the surface can be electroplated or not, only polishing or sandblasting, sand drawing treatment, forming a three-dimensional appearance with different effects.
Due to the craze of all-steel watches, titanium gradually emerged. Its material is called “Aviation Age” metal. What is titanium? Titanium metal is found in the earth’s crust, and its appearance can be bright and shiny metal, or silver-gray, dark-gray powder. Titanium is a light, hard, heat-resistant and cold-resistant metal with an oxide film on the surface to prevent wear and corrosion.
(7) Tungsten Titanium Alloy
First press the tungsten carbide and titanium carbide powder into the blank with a pressure of 1000 Pa, then die-cast the mold, and then in a special furnace at 1450 degrees Celsius The high temperature sinters it into extremely high-density parts. Finally, after multiple processes and polished with diamond powder, a sparkling tungsten-titanium alloy is made with good wear resistance.
(8) Tungsten steel
High hardness, wear resistance, clear lines, bright and clean, called “wear resistant material”. It can be used in combination with steel to make a watch case ring or watch band or pellets to increase the abrasion resistance and decoration of the surface of the case and band.
Precision ceramics are smooth, wear-resistant, and do not damage the skin. The main component is zirconia, which can obtain good processing performance under certain temperature conditions. Then, through advanced processing methods, it can be made into exquisite watch cases and straps. It can also be made by special methods. Various colors are more gorgeous and noble.
(10) High-tech ceramics
The ultra-fine zirconia or titanium carbide powder is injected into the mold at high pressure and then formed into ceramic parts that are not easy to wear in a sintering furnace at a high temperature of 1450 degrees Celsius; then polished with diamond powder to make a unique high gloss. Technical ceramics.
(11) High-tech lanthanum
The rare rare earth element lanthanum is broken up and refined into particles, and the crude embryo is put into a furnace and compressed by high temperature and high pressure. Its hardness is higher than that of tungsten-titanium alloy and high-tech ceramics, it is less easy to wear, and it emits a mysterious light.
(12) Blue steel
Blue steel is a kind of steel formed by a special smelting process, so it emits a blue halo color. Blue steel is mainly used for pointers. In addition to aesthetics, it also has anti-oxidation properties.