HiSiaddi is an innovative foreign trade service provider driven by both technology transformation and foreign trade services. It has built a service system defined as "1+2+3+4=1" and can supply aluminum diboride sourced from multiple well-known original manufacturers.
As an R&D-oriented foreign trade enterprise, HiSiaddi has repeatedly collaborated with factories on technology transformation and accurately captured market demands to propose formulation optimization schemes and application improvement suggestions for aluminum diboride. Below is a case illustrating HiSiaddi’s consultation services on aluminum diboride formulation optimization.
Should you require further formulation optimization consultation services, please contact HiSiaddi’s customer service team.
Ital Aero Materials Srl, an EU mid-to-high-end aerospace supporting enterprise based in Italy, specializes in lightweight aluminum matrix reinforcing composite materials for Airbus supporting parts and high-temperature resistant protective coatings for aero-engine components. Its products comply with EU aerospace ASTM raw material standards, with aluminum diboride (dominated by AlB₁₂) serving as the core reinforcing filler. The company purchases 68 tons of high-end customized aluminum diboride annually, having long sourced raw materials from European and American suppliers before launching localized procurement from China in 2025 with customized high-purity domestic aluminum diboride put into batch production.
The client’s composite formulation and vacuum hot-pressing sintering process have been filed with Italian aerospace regulatory authorities, with regulations prohibiting large-scale adjustments to matrix ratios and main furnace temperature parameters. One week after the first batch of 32 tons of domestically produced aluminum diboride was put into production, three fatal production failures emerged across the entire production line: slurry agglomeration and caking, dense pinholes on pressed blanks, dense internal pores plus edge cracks on sintered finished products, leading to substandard mechanical strength of aerospace components. The finished product defect rate surged from 0.5% with imported raw materials to 28.7%, risking delayed delivery and compensation for downstream Airbus supporting orders. Italian local material engineers repeatedly adjusted internal additive ratios yet failed to eliminate root causes. Domestic powder suppliers only control factory exit indicators without familiarity with backend composite forming logic. The client entrusted foreign trade provider HiSiaddi to lead technical research and troubleshooting, implementing rectification solutions across four dimensions: powder traceability, fine-tuning of slurry formulation, sintering process optimization and reverse improvement of upstream post-treatment of aluminum diboride powder.
Collaborating with a CNAS-certified third-party material laboratory, HiSiaddi conducted full testing of aluminum diboride raw powder, mixed slurry, scrapped blanks and cracked finished products including XRD phase analysis, oxygen-nitrogen content testing, ICP impurity detection, particle size analysis and powder surface morphology characterization. Three overlapping root causes were identified: physical and chemical property differences between domestic and imported aluminum diboride, original formulations calibrated for European and American powders, and insufficient matching with workshop operating conditions.
Domestic aluminum diboride featured total oxygen content of 0.52wt% (vs. ≤0.42wt% for imported raw materials), with polar oxide films of B₂O₃ and Al₂O₃ formed on particle surfaces. Inadequate particle size classification control led to excessive ultrafine dust, causing electrostatic adsorption and agglomeration of particles. The client’s original oil-based slurry dispersant dosage of 0.6% was calibrated for low-oxygen, narrow particle size imported aluminum diboride, insufficient to coat the oxidized surface layer and ultrafine particles of domestic powder. Viscosity fluctuations of slurry exceeded 35% day and night after ball milling, with stratification and caking upon standing, resulting in material shortage and micron-scale pinhole defects on injection-molded green blanks.
Free aluminum content of powder reached 0.22% and total K+Na alkali metals hit 1.35 ppm, exceeding internal control standards of ≤0.2% and ≤1 ppm respectively. During high-temperature sintering, impurities abnormally combined with Y₂O₃-Al₂O₃ sintering additives in the formulation to generate low-melting glass phases. The molten phases encapsulated gas to form closed internal pores, while inconsistent sintering shrinkage rates across blank regions induced radial penetrating cracks on component edges during cooling. Composite material density only reached 95.3% against the standard threshold of ≥99.1%.
Domestic ultrafine aluminum diboride has a larger specific surface area and far faster moisture absorption rate than imported powder. The client’s batching workshop maintained constant humidity of 60%, leading to rapid free water adsorption once powder was unpacked. The original process adopted a constant heating rate of 3℃/min for degreasing, causing instant vaporization of binders and adsorbed moisture with no time for slow gas discharge, forming bubbling voids inside blanks. These voids transformed into crack sources after sintering, further lowering finished product yield.
Solutions were implemented in three phases: short-term on-site emergency optimization to rapidly reduce in-process scrap rates, medium-term fine-tuning of slurry and sintering formulations, and long-term reverse technical upgrading of upstream aluminum diboride powder.
1. Dehumidifying units were installed in batching and ball milling workshops to lock ambient humidity between 43% and 48%. All aluminum diboride powder was fully fed within 24 hours after unpacking; unused residual powder was vacuum-sealed in aluminum foil and refrigerated to isolate air moisture absorption.
2. A 110℃ vacuum pre-drying step with 12-hour heat preservation was added before feeding to remove adsorbed water on powder surfaces and eliminate gas generation risks during sintering at the source.
3. Low-speed pre-mixing for 30 minutes prior to slurry feeding allowed organic solvents to pre-wet and disperse soft powder agglomerates before formal ball milling. Post-implementation, green blank scrap rates dropped from 28.7% to 8.9%.
The original single phosphate ester dispersant was replaced with a composite system of high-molecular phosphate ester + PVP. Total dispersant dosage was raised from 0.60% to 0.82%; long-chain high-molecular polymers preferentially coated polar oxide layers on powder to eliminate electrostatic agglomeration. Meanwhile, plasticizer dosage was reduced from 7.2% to 6.3% to avoid excessive slurry fluidity caused by increased dispersant. Ball milling duration was extended from 12 h to 14.5 h with silicon nitride ceramic grinding beads for full particle dispersion, limiting slurry viscosity fluctuations within ±7% and restoring slurry stability to levels equivalent to imported raw materials.
The original Y₂O₃:Al₂O₃ ratio of 6.4:1.6 was adjusted to 6.8:1.2. Increased yttrium oxide content preferentially captured alkali metal impurities to form high-melting stable crystal phases, inhibiting generation of low-melting glass minor phases and reducing sources of closed internal pores.
Degreasing was revised into three-stage temperature control: slow heating at 1℃/min from room temperature to 215℃ → constant temperature holding at 215–450℃ for 2.5 h to slowly decompose binders → constant heating at 2℃/min from 450℃ to 600℃, with trace high-purity argon injected into the furnace to assist gas discharge. Hot-pressing holding time was shortened from 4 h to 3.2 h to match the crystal phase transformation rate of domestic aluminum diboride and alleviate shrinkage stress cracking. After formulation optimization, small-batch trial production achieved sintered density up to 98.97% and component defect rates fell to 3.2%, successfully securing delivery of the current Airbus trial order.
HiSiaddi coordinated with aluminum diboride manufacturers to upgrade dedicated production lines with targeted process improvements:
1. High-purity pretreatment of raw materials: Ordinary industrial aluminum and boron powder were replaced with electronic-grade high-purity atomized aluminum powder and amorphous boron powder. Raw materials underwent pickling impurity removal and vacuum drying deoxygenation in advance to control mineral-derived heavy metal and alkali metal impurities at the source.
2. Segmented synthesis under sealed inert atmosphere: Full-process argon-protected vacuum furnaces with segmented temperature control for synthesis, precise regulation of aluminum-boron molar ratios to control free aluminum and AlB₂ minor phase generation, delivering finished products with main AlB₁₂ phase ≥93.5% and free aluminum reduced to 0.16%.
3. Full ceramic lined crushing + three-stage air classification: Silicon nitride ceramic liners for all crushing and classification chambers to eliminate iron impurities leached from equipment wear; three-step sorting removed coarse particles and excessive ultrafine powder to stabilize D50 within 3.2–3.4 μm.
4. Low-temperature vacuum passivation of finished products: Low-temperature vacuum removal of adsorbed oxygen on powder surfaces, stabilizing total oxygen content of finished products at ≤0.44wt%, with powder anti-oxidation and dispersion performance matching European and American original imported products.
1. 500 kg of optimized samples were air-shipped to Italy, with the client reproducing the full mass production process. Mechanical and high-temperature resistance indicators of composite materials passed third-party certification issued by the Italian Aerospace Materials Institute, delivering finished product defect rates of 0.48% that fully met Airbus supply standards.
2. The remaining 36 tons were produced in three batches. HiSiaddi completed EU REACH pre-registration, SCIP database filing, Italian-English bilingual SDS preparation and RoHS vehicle standard testing reports for full compliance. Products were packed in vacuum aluminum foil + sealed iron drums for compliant shipment from Shanghai Port to Genoa Port, clearing customs and warehousing in one smooth process. Comprehensive domestic procurement costs decreased by 33.6% compared with imports.
3. In the following year, the client renewed an annual long-term framework order for 76 tons of aluminum diboride. It also entrusted HiSiaddi with exclusive agency for all domestic customization, formulation technical coordination and export compliance services for special boride powders including zirconium diboride and cerium hexaboride. Building on the reputation of this project, HiSiaddi successfully developed two leading European aerospace composite clients in France and Austria.
Most domestic aluminum diboride manufacturers target low-end refractory and general wear-resistant filler markets, adopting low-cost open aluminothermic reduction production lines without supporting facilities for sealed high-purity synthesis and full ceramic precision classification. Their powder products typically feature high oxygen content, excessive impurities and severe particle agglomeration. Downstream low-end domestic products have high formulation tolerance, allowing wide adjustments to additives and sintering parameters to mask raw material defects. In contrast, formulations of mid-to-high-end European aerospace clients are filed with aerospace regulatory authorities, prohibiting arbitrary adjustments to matrix ratios and main furnace temperatures. Minor physical and chemical differences in powder trigger full-line production scrapping. Powder manufacturers only master front-end synthesis technology and lack technical reserves for backend composite forming, making them unable to cooperate with end clients on formulation rectification.
Breaking the traditional foreign trade middleman model limited to raw material sales, HiSiaddi built an integrated technical service system covering failure detection & traceability, fine-tuning of slurry formulations, sintering process adaptation, targeted technical upgrading of upstream powder and full supporting export compliance services. It bridges technical barriers between formulation demands of overseas end clients and domestic powder production, securing sustained annual long-framework orders from mid-to-high-end overseas clients through implementable technical services.
Should you require further formulation optimization consultation services, please contact HiSiaddi’s customer service team.
+86-13120989737 
info@hisiaddi.com 
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