How does Hongda use data to address oxygen content, particle size, and the degree of carbonization?

Release time:

2026-05-08 10:30

Source:

In applications such as cemented carbides, thermal spraying, and high‑temperature materials, the stability of metal carbide powders often matters more than their “nominal specifications.” In our day-to-day interactions with customers, we have found that oxygen content, particle size uniformity, and the degree of carbide completeness are consistently cited as key technical priorities.

In response to these genuine needs, Zhuzhou Hongda Industrial Co., Ltd. has established a clear control framework spanning raw materials, manufacturing processes, and quality testing.

1. Oxygen content: Lower is not necessarily better; what matters is stable and controllable.

Excessive oxygen content directly affects the sintering behavior and toughness of the alloy.

In products such as titanium carbide, tantalum carbide, and vanadium carbide, Hongda has established precise control limits for oxygen and related impurities (e.g., O, Na, Ca). For example:

Tantalum Carbide TaC-1: Oxygen content ≤0.25%

Titanium Carbide TiC-1: Oxygen content ≤0.80%

It does not aim for an “extremely low” value in isolation, but rather ensures stable and controllable performance across batches, meeting the process window requirements of diverse customers.

II. Particle Size: Ranging from sub-micron to micron, with a selectable stable distribution.

Different application scenarios exhibit extremely high sensitivity to powder particle size.

Hongda’s product portfolio covers typical average particle size ranges (e.g., 0.5–0.7 μm, 0.8–1.0 μm, 1.0–1.5 μm, 1.5–2.0 μm, etc.), with each grade corresponding to a well-defined particle size range:

TaC-1: 0.5 – 0.7 μm

VC-4 / VC-5: 1.5 – 3.0 μm

Products such as Cr₃C₂ are also supplied in graded particle sizes.

Morphological verification was performed using scanning electron microscopy (SEM) at magnifications of ×5,000 and ×10,000 to ensure a uniform particle distribution and minimize process variability caused by oversized particles or excessively fine powders.

III. How good is the carbonization effect? It depends on the total carbon and free carbon.

Incomplete carburization or an elevated free carbon content can alter the alloy’s phase composition and properties.

We simultaneously control the following in each product category:

Total carbon (C total)

Free carbon (C free)

For example:

TiC Series: Total carbon ≥19.00%, free carbon ≤0.15–0.30%

NbC Series: Total carbon 11.0–11.4%, free carbon ≤0.05–0.15%

“Total carbon stability and low free carbon” are direct indicators of the maturity of the carburizing process.

4. It’s Not Just on the Specification Sheet—Mass Delivery Is the Real Test

Hongda operates under the ISO 9001, ISO 14001, and OHSAS 18001 management systems, and from complex carbides to single-component carbides, it ensures full traceability and re‑inspection for every batch.

If you are following:

Titanium carbide, tantalum carbide, niobium carbide, chromium carbide

Vanadium carbide, molybdenum carbide

Titanium carbonitride or a multicomponent solid-solution powder (W,Ti,Ta)C

Please contact us to request the oxygen content, particle size, and carburization data for specific batches.

Zhuzhou Hongda Industrial Co., Ltd.

Official website: http://www.zzhongdasy.com

Focused on controllable, repeatable carbide powder solutions.

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