IKA A 11.3 hammer, carbide, for A 11 basic, 0002983000

Solid-state physics and tribological resistance

In geochemical analysis, materials testing and building materials inspection, the comminution of extremely hard, mineral or ceramic sample matrices reaches fundamental physical limits. Standard stainless steel grinding tools suffer severe tribological deformation and extreme material wear when used on matrices with a Mohs hardness of over 6. The IKA A 11.3 beater is designed as a highly specialised tungsten carbide tool (tungsten carbide alloy). This intermetallic carbide compound is characterised by extreme structural density and hardness. This material-scientific superiority makes the tool completely immune to plastic deformation caused by abrasive micro-collisions with hard ores, quartzites, glasses or slags within the grinding chamber of the A 11 basic.

Kinetics of extreme impact comminution

The process principle is based on high-speed impact and shock comminution. Driven at rotational speeds of up to 28,000 revolutions per minute, the A 11.3 beater transforms the motor’s electrical energy into massive kinetic impact energy. Due to the extreme hardness and very high specific gravity of the cemented carbide alloy, the mechanical impulse transferred to the sample material upon direct impact is significantly stiffer and involves less energy loss than with more ductile steel alloys. The lattice structures of even extremely brittle, crystalline solids are shattered by these incoming shock waves in fractions of a millisecond and converted into a highly fine, analytically usable powder matrix.

Analytical purity and minimisation of abrasion

A key problem in the analytical sample preparation of hard rocks is contamination caused by mechanical abrasion of the grinding tool (carry-over). Grinding with conventional stainless steel tools inevitably leads to a massive introduction of foreign ions into the sample. The use of the A 11.3 carbide beater physically reduces this tribological wear to an absolute minimum. The structural integrity of the striking edges is maintained even after intensive grinding cycles, ensuring that the mill’s thermodynamic efficiency remains constant and drastically minimising analytical contamination of the sample caused by metallic abrasion.

Technical details

• Product type: Beater for extreme impact comminution (replaceable tool)
• Material: Highly wear-resistant carbide (tungsten carbide alloy)
• Processing principle: Impact and percussion comminution (impact milling)
• Physical scope of application: Extremely hard and brittle matrices (Mohs hardness > 6)
• Kinetic design: Designed for rotational speeds of up to 28,000 rpm
• Analytical advantage: Minimisation of tribological wear and cross-contamination
• Compatibility: Exclusively compatible with the IKA A 11 basic analytical mill
• Assembly: Positive-lock, tool-free mounting on the drive shaft

Contents

• 1 x IKA A 11.3 beater (carbide)

(Important note: The IKA A 11 basic drive unit and the grinding chamber are not included in the scope of delivery!)

Customised requirements & accessories

The A 11.3 beater is the ultimate high-end solution for the hardest materials in the IKA A 11 basic. Whilst carbide is extremely hard and abrasion-resistant, its crystalline structure makes it more susceptible to bending or lever forces than ductile stainless steel. When inserting or removing the tool from the grinding chamber, it must never be forced at an angle to prevent brittle fracture of the shank. Please contact our specialist procurement service at any time for the metrologically correct configuration of your grinding systems.