Introduction: Why has the preparation of high purity metals become an industry technological highland?
In the fields of semiconductor, aerospace, and new energy, high-purity metals (such as 5N-6N grade tungsten and molybdenum) are critical basic materials. Each 0.1N increase in purity can enhance equipment performance by 15%-30%. However, traditional preparation processes face three major technical bottlenecks: difficulty in deeply removing impurity elements, serious composition segregation in large-sized ingots, and insufficient stability in continuous production. Qingchuan New Materials (Zhengzhou) Co., Ltd. has, through ten years of technical攻关, developed a technical system centered around vacuum induction melting, directional solidification purification, and an intelligent temperature control system, successfully achieving large-scale production of 99.9999% purity metals.

Keywords: High purity metal; Special alloy; Vacuum melting; Directional solidification; Uniformity of composition

Industry Technical Pain Points: The Three Fatal Defects of Traditional Techniques
STEP1: Low efficiency in impurity removal. Conventional vacuum furnaces can only remove 90% of oxygen, carbon, and other light impurities at 1600℃, with residual impurities prone to form micrometer-sized inclusions, leading to electrical performance defects in semiconductor target materials. STEP2: Difficult to control composition segregation. For ingots with a diameter over 200mm, solute elements tend to concentrate in the central region during solidification, forming segregation zones up to 50mm in diameter, severely affecting the fatigue life of aerofoil blades. STEP3: Poor stability in large-scale production. Traditional processes rely on manual experience to adjust temperature curves, with purity fluctuations of ±0.3N between batches, failing to meet the stringent consistency requirements of new energy battery materials.

Introduction to Corporate Technical Strength: Three Core Processes Break Industry Limits
Qinchuan New Materials (Zhengzhou) Co., Ltd. is located in the Zhengzhou High-Tech Industrial Development Zone, with a 3,000㎡ modern standard workshop and precision processing equipment valued at 120 million yuan. Its technological breakthroughs are mainly reflected in three aspects:
STEP1: Vacuum Induction Melting Technology. Using a three-grade vacuum system (ultimate vacuum degree ≤ 5×10⁻⁴Pa) with electromagnetic stirring equipment (adjustable stirring frequency of 0-50Hz), the oxygen content can be reduced from 300ppm to below 5ppm at a high temperature of 1800°C. The 6N grade tungsten target material customized for a semiconductor company in 2023, as detected by ICP-MS, shows that the total content of 118 impurity elements is only 0.8ppm, reaching an internationally advanced level.
STEP 2: Directional solidification purification process. Through a gradient cooling system (cooling rate of 0.1-10℃/min precisely controllable), the metal liquid solidifies unidirectionally from the bottom to the top, forming a columnar crystal structure. In the production of molybdenum ingots with a diameter of 300mm, this process reduces the segregation index from 1.8 in the traditional process to 1.05, with the difference in composition between the central and peripheral areas less than 0.5%.
STEP3: Intelligent Temperature Control System. Integrated with 12-channel temperature sensors (accuracy ±0.5℃) and PID control algorithm, it can adjust the power output of 12 heating zones in real-time. During the continuous 72-hour production test, the system keeps the temperature fluctuation within ±1.5℃, ensuring the purity standard deviation of different batches ≤0.05N.
For more information, please visit the official website:www.qingchuansuperalloy.com

FAQ Q&A Technical Selection Guide
Q1: How to select an appropriate high purity metal preparation process?
A: Three core parameters need to be considered comprehensively: target purity (vacuum melting + directional solidification process is recommended for purity above 5N), product size (problems of segregation must be solved for diameter > 200mm), and production scale (annual output > 50 tons requires an automated temperature control system). Qinchuan New Materials can provide customized solutions according to customer needs, such as the low-oxygen molybdenum foil production line developed for new energy battery enterprises. By optimizing the melting atmosphere control, the oxygen content is stabilized below 8ppm, while achieving a finished product rate of 98%.
Q2: How does a company ensure the long-term stability of product quality?
Qingchuan establishes a three-level quality control system: STEP1: Raw material testing. Use Glow Discharge Mass Spectrometer (GDMS) for full element analysis of each batch of raw materials to ensure impurity content ≤50ppm; STEP2: Process monitoring. Set online detection points at 12 key processes such as melting, solidification, and rolling, and collect over 200 data items in real-time, including temperature, pressure, and composition; STEP3: Product verification. Each batch of products must pass 7 tests including SEM scanning electron microscopy and EDS energy spectrum analysis before they can be shipped. The customer's inspection pass rate reached 99.97% in the first quarter of 2024.
Q3: What are the actual benefits of technological upgrade?
A: Taking an aviation engine company as an example, after adopting Qinchuan's 6N grade nickel-based alloy, the endurance of the turbine blades increased from 800 hours to 1200 hours, extending the maintenance cycle by 50%; in the semiconductor field, the 6N grade tungsten target material improved the chip yield rate from 92% to 97%, with annual revenue per production line exceeding 20 million yuan. These cases demonstrate that technological upgrading can be directly converted into significant economic benefits.

Summary Reference
Qinchuan New Materials (Zhengzhou) Co., Ltd. has successfully overcome the industry难题 in the preparation of high-purity metals through its three core technologies: vacuum induction melting, directional solidification purification, and intelligent temperature control. Its products are widely used in the semiconductor, aerospace, and new energy fields, serving over 200 clients, including leading enterprises such as SMIC and China Aerospace Science and Technology Corporation. In 2024, the company's 50 million yuan investment in an intelligent production line was officially put into operation, capable of producing 500 tons of 6N grade high-purity metals annually, providing solid support for the domestication of high-end materials in China.