Aluminum oxide ceramic screw Ceramic Screw

• 1.High strength insulation and high temperature resistance
• 2. Corrosion resistant and non-magnetic
• 3.High hardness and dimensional stability

1.Excellent mechanical performance and structural integrity

The mechanical properties of alumina ceramic screws are one of their fundamental advantages compared to traditional metal fasteners. This special screw is made of high-purity (usually ≥ 99.5%) alumina through isostatic pressing and ultra-high temperature sintering. Its microstructure is dense and uniform, exhibiting excellent physical properties. Firstly, its hardness is extremely high, with a Vickers hardness that far exceeds all metal materials and even some hard alloys. This extremely high hardness directly translates into extraordinary wear resistance, even in frequent disassembly or high vibration environments, the threads can remain clear and intact, greatly extending their service life. Secondly, although ceramic materials give a brittle impression, high-quality alumina ceramic screws prepared by modern technology have considerable mechanical strength, with a compressive strength of over 3000 MPa, capable of withstanding huge pre tightening forces and working loads.

In terms of lightweight, the density of alumina ceramics is about 3.6g/cm ³, which is only about 45% of that of steel. This characteristic is particularly important in the weight sensitive fields of aerospace, precision instruments, and racing. More importantly, the high elastic modulus of alumina ceramic screws means that they undergo minimal deformation under stress, providing extremely stable clamping force and avoiding the relaxation of preload force caused by plastic deformation like metal screws. In addition, it completely avoids the common fatigue corrosion and stress cracking phenomena of metal screws, and exhibits excellent durability under cyclic loading. These comprehensive mechanical characteristics make alumina ceramic screws particularly suitable for critical connection parts that require high wear, high load, and long-term stability, such as precision machine tool spindles, high-speed bearing fixation, and key joints in automated robots.

2.Thermal stability and high temperature resistance in extreme environments

Aluminum oxide ceramic screws also perform well in high-temperature environments, which is a key advantage that most metal fasteners cannot match. Its melting point is as high as 2050 ℃, and its long-term stable working temperature can reach over 1600 ℃. In the short term, it can even withstand extreme high temperatures of 1800 ℃. Under these conditions, aluminum oxide ceramic screws will not experience oxidation, peeling, creep, or a sharp decrease in strength like metal screws. When the ambient temperature rises from room temperature to operating temperature, its coefficient of thermal expansion is relatively low, which means that the effect of temperature changes on screw size and preload is much smaller than that of metal materials.

It is particularly worth emphasizing its excellent thermal shock resistance. Through precise microstructure design, high-quality alumina ceramic screws can withstand rapid temperature changes without cracking. For example, in semiconductor manufacturing equipment, screws may require frequent rapid heating and cooling processes from room temperature to hundreds or even thousands of degrees Celsius. Aluminum oxide ceramics, due to their low thermal conductivity and appropriate heat capacity, can effectively alleviate thermal stress concentration and maintain structural integrity. In contrast, even special heat-resistant alloys can fail due to fatigue under such harsh thermal cycles.

In addition, under high temperature conditions, alumina ceramics maintain their original mechanical properties and insulation characteristics, and will not produce electronic conductivity due to thermal activation, which is crucial for the insulation fixation of high-temperature electrical equipment. In a vacuum high-temperature environment, it does not release volatile substances like metals, avoiding system pollution. These characteristics make alumina ceramic screws an ideal choice for applications such as heat treatment furnaces, sintering equipment, aircraft engine hot end component experimental devices, and high-temperature sensor fixation.
 

3.Extraordinary corrosion resistance and chemical inertness

It has excellent chemical stability and can resist the corrosion of most acids, bases, salts, and various organic solvents. Its corrosion resistance is far superior to special metals such as stainless steel and even Hastelloy. It can also work stably for a long time in extremely corrosive media such as strong acids and bases, without rusting or producing metal ions that pollute the process. This feature makes it an ideal choice for connecting pumps, valves, reactors, and pipelines in harsh environments such as chemical, pharmaceutical, food processing, and marine engineering, effectively avoiding equipment failures and product contamination caused by screw corrosion.

4.Excellent electrical insulation and non-magnetic properties

The volume resistivity is extremely high, which can effectively isolate current even in high temperature environments, preventing the risk of arc breakdown or short circuit. At the same time, it is essentially non-magnetic and not affected by any strong magnetic field environment, with zero magnetic permeability. This makes it perfectly suitable for high-precision electron beam equipment, MRI magnetic resonance imaging systems, semiconductor manufacturing equipment in vacuum environments, and various precision measuring instruments, greatly eliminating the electromagnetic interference, eddy current loss, and magnetic contamination problems that may be caused by metal screws

5.Aluminum oxide ceramic screws have become a key component for upgrading and replacing many high-tech and industrial fields.

From semiconductor wafer manufacturing, solar photovoltaic production to high-end analytical instruments, from chemical anti-corrosion, medical equipment to aerospace, it can provide solutions that traditional metal screws cannot match. Although its single item procurement cost may be high, its long lifespan, high reliability, low maintenance cost, and guarantee of overall system performance and purity make it demonstrate extremely high comprehensive economic benefits throughout its entire lifecycle.