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Industry‑wide quality‑control standards continue to rise, and Mudanjiang Qianjin Boron Carbide has upgraded its testing laboratory to establish a closed‑loop quality‑inspection system.

Industry‑wide quality‑control standards continue to rise, and Mudanjiang Qianjin Boron Carbide has upgraded its testing laboratory to establish a closed‑loop quality‑inspection system.

In recent years, regulatory oversight of the domestic superhard abrasive industry has become increasingly standardized. Market regulators routinely conduct random inspections of boron carbide product quality, while downstream enterprises in sectors such as semiconductors, nuclear power, and high-end equipment manufacturing have all established stringent supplier‑qualification criteria. Manufacturers that possess comprehensive, independent testing capabilities and standardized quality‑control processes are better positioned to secure long-term, stable partnerships. As a strategic superhard material, boron carbide’s core performance indicators—such as powder purity, particle-size distribution, free carbon impurities, and hardness—directly determine the machining accuracy of downstream components and the service life of finished products. Consequently, the establishment of robust testing and metrology infrastructure has become an indispensable prerequisite for the industry’s sustainable operation.

12

2025

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07

Fundamental Properties, Applications, and Chemical Stability of Boron Carbide

Fundamental Properties, Applications, and Chemical Stability of Boron Carbide

Boron carbide crystals have a rhombohedral structure, with the lattice belonging to the D3d–R3m space group. Its rhombohedral structure is shown in Figure 7 and can be described as a cubic primitive cell stretched along the body diagonal, forming regularly arranged icosahedra at each corner. Parallel to the body diagonal, this corresponds to the hexagonal c-axis, where linear chains are formed by three boron atoms interconnected with adjacent icosahedra. Consequently, the unit cell contains 12 icosahedral orientations, with three orientations lying along the linear chains. If we consider B atoms as occupying positions defined by the icosahedra and C atoms as residing on the linear chains, then the stoichiometric formula B12C3 is obtained. 1. Basic Properties and Applications of Boron Carbide 1) Low Density Boron carbide exhibits a relatively low density of 2.52 g/cm³. Within the homogeneous phase region, the relationship between density and carbon content can be expressed empirically by Equation (9): ρ = 2.4224 + 0.00489C% (9) Due to its low density, even when achieving high degrees of densification, boron carbide maintains excellent properties such as high strength and hardness. Therefore, it can serve as a lightweight armor material, reducing the weight of tanks and other vehicles while conserving energy. 2) Hardness and Wear Resistance Boron carbide possesses exceptional hardness and outstanding wear resistance. Within the homogeneous phase region, its Vickers hardness increases with increasing carbon content. At a carbon content of 10.6%, the hardness reaches 29.1 GPa; at 20% carbon, it can rise up to 37.7 GPa. Even at elevated temperatures, its hardness remains very high (>30 GPa). The temperature dependence of hardness can be described by empirical Equation (10): H = H0 − exp(−aT) (10) where H0 represents the hardness at room temperature, T denotes temperature, and a is a constant related to carbon content. This equation applies over the range of 20–1700°C. It should be noted that boron carbide ranks among the hardest materials in the world, second only to diamond and cubic boron nitride. The wear resistance of boron carbide improves with rising temperature. Within the range of 20–1400°C, its coefficient of friction decreases as temperature increases, reaching approximately 0.05 around 1400°C, accompanied by a continuous reduction in frictional wear. Owing to its extreme hardness and favorable tribological characteristics, boron carbide has been employed for sandblasting nozzles, diamond‑based nozzles, and water‑jet cutting nozzles—materials renowned for their wear resistance. Militarily, it is widely utilized as an armor material for tanks, aircraft, and other applications [39,40]. With advances in technology and growing demand for high‑precision grinding, boron carbide’s advantages have become increasingly evident, leading to steadily rising consumption in recent years. Additionally, boron carbide can be used to grind hard alloys, ceramics, and gemstones, serving as a free abrasive or ultrasonic machining medium for these ultra‑hard materials. However, compared with Europe and North America, China still lags behind in the application of boron carbide in this field. 3) Coefficient of Thermal Expansion and Specific Heat Capacity Boron carbide melts at 2450°C and boils at 3000°C. Its coefficient of thermal expansion is 5.73 × 10⁻⁶/°C (over the range of 28–1770°C), while its specific heat capacity is given by Equation (11): C = 22.99 + 5.40 × 10⁻³T − 10.72 × 10⁵T⁻² (11) 2. Chemical Stability Boron carbide is one of the most chemically stable compounds. Below 600°C, it resists oxidation; above 600°C, surface oxidation forms a thin B₂O₃ layer that effectively inhibits further oxidation. For this reason, boron carbide is now commonly used as an antioxidant additive in refractory materials. At room temperature, boron carbide generally does not react with chemical reagents; however, above 800°C, it reacts with bromine to form tribromides. At higher temperatures, boron carbide also reacts with metal oxides, producing metal borides and carbon monoxide. The resulting FeB film exhibits exceptionally high microhardness (HV = 24 GPa) and excellent wear resistance, making boron carbide suitable for boriding steel and alloy materials.

19

2020

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10

Letter of Contact Regarding the Name Change of Mudanjiang Qianjin Boron Carbide Co., Ltd.

Letter of Contact Regarding the Name Change of Mudanjiang Qianjin Boron Carbide Co., Ltd.

Dear Partner, Thank you very much for your continued trust and support! Due to business development needs, Mudanjiang Qianjin Boron Carbide Co., Ltd. relocated in its entirety to Shiqian County, Sichuan, on August 15, 2020, and has officially changed its name to Shiqian Baisen Technology Abrasives Co., Ltd. Effective from August 15, 2020, we hereby inform you of the following: 1. As a result of this relocation, your company may have some concerns regarding product quality, service standards, and pricing at Shiqian Baisen Technology Abrasives Co., Ltd. We would like to assure you that, while maintaining the highest product quality, we will offer competitive pricing. For specific details on price concessions, please contact Ms. Huang Qian (General Manager; Tel: 13069799077). 2. Below are the relevant details of Shiqian Baisen Technology Abrasives Co., Ltd.: Company Name: Shiqian Baisen Technology Abrasives Co., Ltd. Unified Social Credit Code: 915118243144104086 Registered Address: Zhuma Industrial Park, Huilong Township, Shiqian County Legal Representative: Mr. Huang Baisen Bank: Agricultural Bank of China, Shiqian County Branch Account Number: 22544101040016478 Bank Identifier Code: 103677554411 Telephone: 0835-8885118 We appreciate your understanding and look forward to continuing our collaboration. Please feel free to reach out if you have any questions or require further information. Sincerely, [Your Name] [Your Position] Shiqian Baisen Technology Abrasives Co., Ltd.

19

2020

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10

Mudanjiang’s boron carbide powder materials account for 40% of the international market share.

Mudanjiang’s boron carbide powder materials account for 40% of the international market share.

In recent years, Mudanjiang City has vigorously developed its new materials industry, which has now reached a considerable scale: there are 48 enterprises above designated size, accounting for approximately 7% of the city’s industrial sector. Its product portfolio primarily encompasses four major categories—hard materials, specialty fibers and composite materials, novel chemical raw materials, and advanced building functional materials. Mudanjiang boasts abundant mineral resources, with 80 distinct types of minerals currently identified and 41 of them having proven reserves, representing 47.1% of Heilongjiang Province’s total and 17.5% of China’s national total. The region is rich in energy resources such as coal and oil shale, as well as metallic resources including iron, copper, and gold, alongside non-metallic resources like graphite, sillimanite, wollastonite, calcite, quartz sand, refractory clay, basalt, granite, perlite, pumice, volcanic ash, and marble. Through sustained development in recent years, Mudanjiang’s new materials industry has diversified from a single product—boron carbide—to encompass dozens of varieties, including silicon carbide, boron carbide, industrial silicon, and specialized ceramic materials and finished products. Boron carbide powder accounts for 40% of the global market and 80% of the domestic market; 80% of its industrial finished products are exported, capturing 15% of the international market and 80% of the domestic market. Mudanjiang stands as the world’s largest export hub for green silicon carbide powder, with annual exports exceeding 20,000 tons, representing 60% of the global market. The Mudanjiang Special Materials Industrial Base has been recognized as a National High-Tech Industrialization Base, one of three such bases in Heilongjiang Province. Furthermore, Mudanjiang is a key production center for graphite within the province, with proven graphite ore reserves totaling 240 million tons, and plans underway during the 13th Five-Year Plan period to establish three advanced graphite processing projects. Mudanjiang has also actively promoted research and development in new materials, earning designation by the Ministry of Science and Technology as a national base for special materials under the “863 Program.” Jin Gang Zuan Boron Carbide Co., Ltd. operates a postdoctoral research station and a provincial-level enterprise technology center, while Chenxi Boron Carbide Co., Ltd. has established an industry–university–research consortium with the Shanghai Institute of Ceramics, Chinese Academy of Sciences. The city is home to several R&D institutions, including the Provincial Paper Industry Research Institute and the Hard Alloy Research Institute. Meanwhile, Mudanjiang Normal University hosts a provincial key laboratory focusing on novel carbon-based functional and ultra-hard materials, staffed by 33 doctoral and master’s degree holders, undertaking 25 scientific research projects at or above the provincial and ministerial levels, and holding three national patents. The lab primarily conducts applied research on diamond films and related materials, low-dimensional materials, and electronic functional materials.

27

2018

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11

Recruiting Talents

Recruiting Talents

Information is being organized...

27

2018

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03

Boron Carbide – Precautions for Use

Boron Carbide – Precautions for Use

Hazardousness Harmful, irritant Packaging and Storage Packaged in polyethylene plastic containers and stored in a clean, dry warehouse.

27

2018

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03

Packaging and Storage of Boron Carbide

Packaging and Storage of Boron Carbide

Packaged in polyethylene plastic containers and stored in a clean, dry warehouse.

27

2018

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03

Physicochemical properties of boron carbide

Physicochemical properties of boron carbide

Physicochemical properties of boron carbide

27

2018

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03

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