GB/T 45871-2025 in English

Background of Standardization and Technological Evolution

GB/T 45871-2025 "Alumina Slurry for Stereolithography of Ceramics in Additive Manufacturing" is an important technical standard jointly issued by the State Administration for Market Regulation and the Standardization Administration of China. The formulation of this standard marks a major progress in my country's standardization work in the field of ceramic additive manufacturing and fills the gap in the standardization of ceramic stereolithography materials.

With the rapid development of ceramic additive manufacturing technology, stereolithography technology has attracted much attention due to its high-precision and complex structure forming capabilities. As an important structural ceramic material, the properties of alumina slurry directly affect the quality and performance of the final product. This standard provides a unified technical basis for the industry by standardizing the composition, preparation process, technical requirements and inspection methods of alumina slurry.

Term Definition and Core Concept Analysis

Chapter 3 of the standard clearly defines the key terms related to alumina slurry:

Alumina slurry: A liquid mixture of alumina powder, photosensitive polymer materials, dispersants, photoinitiators, etc. mixed in a specific proportion. This slurry needs to have good rheological properties and light curing characteristics.

Solid phase content: refers to the volume fraction of ceramic powder in the slurry, which is a key parameter affecting the viscosity of the slurry and the density of the final product.

Curing index: includes two important parameters: curing depth and edge curing error, which are directly related to molding accuracy and quality.

Material composition and ratio requirements

Chapter 4 of the standard specifies the composition requirements of alumina slurry in detail:

Alumina powder needs to comply with GB/T 24487 standard requirements ensure the basic performance of the material. For dense components, it is recommended to use powder with a particle size D50 value of 0.1-5μm. This particle size distribution is conducive to obtaining high solid content and good rheological properties.

Preparation process and environmental control

Chapter 5 of the standard specifies the preparation method and environmental requirements for alumina slurry:

Equipment requirements: Mixing equipment, oven, weighing equipment with an accuracy of not less than 0.01g, etc. are required. All tools that come into contact with the slurry need to be cleaned with anhydrous ethanol to avoid contamination.

Environmental conditions: The temperature is controlled at 10-35℃, the humidity is ≤65%, and operation must be avoided from ultraviolet light. Operators need to wear dust-free latex gloves and dust masks to ensure the cleanliness of the production environment. Preparation Process: Alumina powder and dispersant are uniformly mixed using high-speed stirring or ball milling. After drying, photosensitive polymer materials and other additives are added. Finally, the mixture is defoamed and homogenized under vacuum conditions. The vacuum level is generally no greater than 10 Pa, and the treatment time is no less than 30 minutes.

Key technical requirements and performance indicators

Solid content requirements

Curing performance indicators

Curing depth: preferably within the range of 0.06-0.16mm. The exposure energy density for the surface light source process is 10-20mJ/cm², and for the point light source process it is 15-25mJ/cm². Edge curing error: Should be within ±0.1mm, and for fine structure forming, it is best to control within ±0.02mm.

Rheological properties requirements

Other performance requirements

Zeta potential: preferably 4.0-8.0mV, which affects the stability of the slurry.

Appearance quality: Usually pure white or light yellow, without visible bubbles and inclusions.

Test methods and inspection rules

Inspection items and sampling requirements

Inspection items	Sampling quantity	Sampling method
Solid content	≥50g	According to GB/T 6680 Regulations: Cure Index ≥ 200g Shear Viscosity ≥ 100g Zeta Potential ≥ 500mL Appearance Quality Bottle/Bag Inspection Bottle/Bag Inspection Important Test Methods: Solids Content Test: In accordance with Appendix A, use a thermogravimetric analyzer to increase the temperature to 800°C in air at 10°C/min, and calculate the solid volume content based on the TG curve. Cure Index Test: In accordance with Appendix B, prepare test samples of specific dimensions and measure the cure depth and edge cure error. Shear Viscosity Test: Determined using a rotational viscometer method in accordance with GB/T 45765. Zeta Potential Test: Aqueous alumina solutions are tested in accordance with GB/T 44149. Non-aqueous solutions are determined by negotiation between the supplier and buyer. Quality Control and Implementation Recommendations Production Process Control Raw Material Quality Control: Ensure that raw materials such as alumina powder, dispersant, and photosensitive resin meet standard requirements and establish a strict incoming inspection system. Process Parameter Monitoring: Strictly control key process parameters such as mixing time, vacuum level, and defoaming time to ensure batch-to-batch consistency. Environmental Condition Maintenance: Maintain controlled temperature and humidity in the production environment and avoid UV exposure to prevent changes in slurry properties. Inspection and Judgment Rules Establish a comprehensive inspection system and conduct inspections in accordance with the sampling methods and testing frequency required by the standard. If the performance test fails, double samples may be taken for re-testing. If the test still fails, the entire batch of products will be deemed unqualified. Failure of the appearance quality test will result in the immediate rejection of the product. Packaging, Storage, and Transportation Requirements Use airtight, light-proof containers and vacuum-seal. Protect from light, moisture, and impact during transportation. Store at a temperature of 5-30°C and a humidity of ≤65%, away from light. If undissociated agglomerates appear after three months of static storage, the product should be scrapped. Significance of Standard Implementation and Industry Impact The implementation of GB/T 45871-2025 will have a profound impact on the ceramic additive manufacturing industry: Regulating Market Order: Unified technical requirements and quality standards will help regulate market competition and eliminate substandard products. Improving Product Quality: Clear technical indicators and test methods provide manufacturers with clear quality targets, contributing to overall industry improvement. Promoting Technological Development: The implementation of this standard will promote the research and development and innovation of related technologies, and promote the further development of ceramic additive manufacturing technology. International Alignment: This standard is aligned with advanced international standards, helping to enhance the international competitiveness of my country's ceramic additive manufacturing products. Companies should familiarize themselves with the standard's content as quickly as possible, establish corresponding quality management systems, and ensure that their products meet the standard's requirements. At the same time, they should strengthen communication and collaboration with upstream and downstream companies to jointly promote the healthy development of the ceramic additive manufacturing industry chain. More samples: NB/T 47013.2-2015 DL/T 5154-2012 GB 18306-2015 Sample only — not a preview of GB/T 45871-2025 Previous Page: 1 / 0 Next Zoom Out 100% Zoom In Search Loading PDF document... Error loading PDF. Please make sure the file is valid and try again. Terms of Service Privacy Cancellation & Refund Policy My Account About Us Contact Us All Rights Reserved © 2026 WWW.CHINASTANDARDS.NET