The present diamond synthesis method is high-pressure, high-temperature (HPHT) method. The homoepitaxial diamond growth process on HPHT-diamond substrate by Chemical Vapor Deposition (CVD) is also well known method for producing diamond substrate. This method is superior in the quality but limits the substrate size.
World's first, large diameter diamond production method
Namiki employs Heteroepitaxy targeting large diamond substrates.
In principal, hetroepitaxy, which uses a foreign material as a basal substrate, has theoretical possibility of producing diamond substrates with the same size as basal foreign substrates.
However, due to the heteroepitaxial strain owing to the lattice and thermal expansion differences of diamond and basal substrate, quality degradation and crack generation still occur in thick bulk diamond growth.
We made a new approach to overcome the above mentioned issues in heteroepitaxy. Based on the world's first Ir/Sapphire basal substrate process technology, we combined with our own newly developed microneedle growth technology (JP Patent 6142415B) which enables to prevent crack generation and allow to grow stress-free, high quality, large diameter diamond substrate for stable production.
The diamond wafer, grown by micro needle method, has been named KENZAN Diamond™ .
Sapphire Wafers
Sapphire Career Wafers
Sapphire Career Wafers
Sapphire plate
Sapphire plate
Sapphire Container and Tube
Sapphire Container and Tube
Heat resistant/dissipation sapphire
Heat resistant/dissipation sapphire
Contract processing
Contract processing
Almina
Alumina is a typical, and generally the most used, material in ceramics. It has high hardness and excellent heat, abrasion, and corrosion resistance. We deal extensively with both high purity alumina (99.99%) as well as general-purpose alumina.
Zirconia
We use high quality, high purity zirconia powder that is domestically produced through the hydrolysis process.
Amongst ceramics, zirconia has the highest strength and toughness, making it an excellent and durable ceramic.
The sintering particle diameter is optimized, therefore an improved, and an improved smoothness in mirror surface processing and plane precision can be obtained.
It is a heat-resistant material with a melting point of 2700 degrees C, and a thermal expansion coefficient close to that of metal, which makes it optimal for joining with metal.
It has excellent corrosion resistance and chemical resistance, and high specific gravity.
Moreover, we handle doped color zirconia (black, blue, etc.) which is used for jewelry.
Zirconia-doped alumina
Zirconia-doped alumina is a white compound ceramics that combines the good characteristics of both materials by adding zirconia to the high purity alumina base. Although it is alumina, its strength nears that of zirconia, and it has attracted attention as a material for structural element made of ceramic. By adding zirconia to strengthen the alumina, it is possible to offer excellent quality.
Silicon nitride
Since silicon nitride has high strength and fracture toughness compared to other ceramics, it is used as a high temperature structure material.In addition, due to its abrasion resistance and lightness of weight, it is used for items such as bearing.
Silicon Hard Metal
Besides high hardness, silicon Hard Metal also has high rigidity. Since it is enhanced abrasion resistance, it is used for mechanical seal parts. Furthermore, since it does not easily react with oxygen even under high temperature, it is used as a heating element, and is also often used for semiconductor fabrication machines and equipment.
Aluminum nitride
Since aluminum nitride has both high thermal conductivity and excellent insulation properties, it is used for the electronic circuit where heat dissipation is needed, and also as a material for ceramic heaters.
Ruby is a kind of corundum, or more precisely an aluminum oxide (Al2O3) minerals.
Although corundum is naturally colorless and transparent when mixed with chromium, a ruby red color appears. In the early 1900s the French scientist Verneuil invented his own methodology to produce ruby and the world's first artificial jewel stone was manufactured. In this methodology, aluminum oxide powder mixed with chromium is melted in a flame above 2000 degrees Celsius and then cooled down to be recrystallized. To this day, a large amount of ruby is still produced by the Verneuil process.
Since ruby is second only to diamond in hardness, it is often used for industrial applications. Adamant-Namiki was the first to use it as a jewel bearing for watches. Ruby has excellent wear resistance, and it is widely used in luxury watches due to its beautiful appearance. In addition, it is used in measuring instruments, ruby scalpels, and as a light source for lasers.
LTCC (Low Temperature Co-fired Ceramics) is a multi-layer glass ceramic substrate which is Co-fired with low resistance metal conductors at low firing temperature (less than 1000℃). It is sometimes referred to as "Glass Ceramics" because its composition consists of glass and aluminum.
