Powder processing furnacesHarper is trusted worldwide for high temperature powder processing furnaces for powders and granular materials, including inorganic chemicals, catalysts, phosphors and powdered metals. Our batch and continuous furnaces and kilns for these materials focus on processing materials in controlled and specialty atmospheric environments and at temperatures from 500 to 3000°C. Our systems can accommodate even the most very finely divided and/or micron and nano-sized materials.

Our experience designing custom batch or continuous thermal processing systems for a variety of applications producing aluminas, carbon/graphite, silicas, titanates, tungsten, cobalt, iron, zinc, quartz, molybdenum, zirconia and more. Harper delivers innovative powder processing furnaces for these materials with a focus on controlled and specialty atmospheric environments. We have breadth and depth of expertise that covers gas-solid or solid-solid reactors providing calcination, graphitization, carburization, controlled oxidation, reduction, purification, pyrolysis, metalizing, debinding, waste remediation, and more.

Unlike other furnace manufacturers, our range of furnace technologies and knowledge of an array of materials allows us to incorporate more advanced features to optimize your process. Harper’s experienced engineering team utilizes our technology toolbox to include patented features like superior seals, mixing techniques, and enhanced flow designs for the most efficient solution possible.

As every material is unique, every powder processing furnace is as well. We don’t shoehorn a standard line of products to fit our customers’ requirements. Our passionate team uses our building blocks to deliver first-of-a-kind solutions for the customer’s distinctive needs in their powder production process while considering the most efficient and effective construction possible. Our focus is on precision control over temperature, purity, atmosphere, material flow and residence-time distribution required for consistent and uniform material processing.

Technology Solutions for Powders

Rotary Tube KilnRotary Tube Furnaces designed by Harper offer exceptional versatility, reliability and energy efficiency and include multiple patented features that enable better mixing, resulting in improved heat transfer and mass transfer for powders.

Many applications require performance and safety that is only achieved by maintaining ultra-high purity. Harper’s Rotary systems consider these high purity applications from beginning to end: material in-feed valves and feeder, high-heat reactor tube, product cooling tube, and material discharge valves and collection. We have the experience to engineer these components to achieve a chemically inert environment all while maintaining a gas-tight and dust-tight system for your advanced material.

Learn more about Rotary Furnaces.
Pusher Plate FurnaceHarper's Pusher Tunnel Furnace systems offer exceptional operating life, low operating cost and high efficiency ideal for the manufacturing of various powdered materials.

As many thermal processes for powders require exacting conditions, our innovative design enhancements consider the delicate pressure control within the system to provide accurate direction of the atmosphere flow path in the kiln. This facilitates evacuation of volatiles and optimizes atmosphere uniformity. Additionally, Harper’s unique gas curtain technology provides zone-to-zone atmosphere definition under specific conditions.

Learn more about Pusher Tunnel Furnaces.
Vertical Kiln SystemHarper's patented Vertical Conveyor furnace offers advanced thermal processing with reactions that are distributed more uniformly and quickly over the surface layer of material to precisely heat powders.

One of many advanced design features, our system’s specialized material movement limits the potential for overheating problems, such as melting/sublimation, sintering or excessive grain growth. In addition to the container-less nature of the design, thermal transfer between product and reactants significantly improves the power efficiency of the unit. Our Vertical system limits heating and cooling requirements to the process material only – containment remains at temperature and the process material moves through it - resulting in better heat and mass exchange between products and reactants for improved efficiency.

Learn more about Vertical Conveyor Furnaces.