Liu Shuzhen: Review of Early Development of Flaky Catalyst Alloys

In the autumn of 1973, the Hunan Institute of Metallurgical Geology came to China to entrust the melting and processing of Ni76Mn24 alloy strips. The task was carried out by Cui Yongliu and I. We refer to the general Ni-based alloy manufacturing process and provide two batches of strips for each other. The second machine department 233 factory and the Guilin Institute of Metallurgical Geology also requested the smelting and processing alloy belt, and its composition is (Ni76Mn24).

In December 1973, the room leader sent me to investigate the development status of domestic synthetic diamond catalyst alloys. I visited the major diamond research units and alloy manufacturers in Beijing and Shanghai, and had a preliminary understanding of the general situation of the industry.

In May 1974, the National Bureau of Three Departments held a seminar on the application and discussion of synthetic diamonds at the Hunan Tin Mine. At the meeting, the “Diamond 100” diamond drilling rig was identified, which was synthesized by the Hunan Metallurgical Geology Institute. Diamond, after the drill bit is made, the drilling effect is particularly prominent with the "Diamond 100" rig (11 limestone: aging 2 m / h, total footage 11 m). At that time, it ranked first in the country, known as the singles champion, so the catalyst alloy in our hospital became a hit, causing the attention of superiors and the industry. After the meeting, the Ministry of Metallurgy, the Ministry of Machinery and the leaders of the State Geological Bureau came to visit our hospital. The Director of the Department of Geology of the Ministry of Metallurgy requested the Institute to strengthen the research work on catalyst alloys and decided to allocate funds to improve the alloy melting conditions in our hospital. In July 1974, Fang Jun and I went to Zhengzhou and Sanmao to discuss the research cooperation of catalyst alloy. The agreement proposed to replace the popular NiMn binary alloy (such as Ni70Mn30, Ni76Mn20) and NiCrFe alloy with NiMnCo ternary alloy, which was agreed by Changsha. The institute is responsible for the development of catalytic alloys, and Sanma is responsible for the application of catalytic alloys in diamond synthesis.

In August 1974, the First Machinery Department held a “large particle synthetic diamond seminar” (invited by our institute) in Shanghai. In the national diamond development plan formulated at the meeting, we designated our institute to be responsible for the development of synthetic diamond catalyst materials. Unit, I immediately reported the matter up after the meeting.

In October 1974, we issued the first batch of N70iM25nCo5 alloy strips to Sanmao. After one month, the three mills returned the composite results. It is said that the target indicators of the Institute have been met, and the subject has been internally identified by Sanmao.

At the beginning of 1975, the leader decided to set up a catalyst alloy group. Wang Guangzu was appointed as the leader of the diamond and catalyst research project. With the increase of the participants, in addition to the NiMnCo alloy, the 2# catalyst (NiMnCoNbCu) 3# catalyst was later developed. The research work of NiMnCu) was approved by the ministerial level in 1977 and 1986, and was promoted and applied in China.

Ni70M25nCo5 alloy (or 1# catalyst) is the focus of the group. At first, there is controversy in the alloy composition ratio. Because of the large amount of Ni and Co used in the alloy, they are all valuable metals, depending on the import, especially the price of metal Co. Expensive, it is best to use less or not. We will select the Co content as 3%, 5%, 7%, 10%, 15% under the premise of adjusting the percentage of Ni and Mn, and prepare a batch of alloys according to the previous process. The strips were sent to Sanmao, Guilin Metallurgical Institute and Hunan Metallurgical Institute. The results of the three returned tests showed that: 1Co%<3% diamond color is light, strength is reduced, 2Co%>10% diamond color and strength There was no significant change in the effect with the 5% Co alloy. After a unified understanding of the alloy composition, we spend more time on improving the alloying process and improving the properties of the alloy, including the improvement of the smelting process and the addition of trace elements such as C, B, Cr, Al, Ce, and La to the alloy properties and diamond. The effect of the synthetic effect, at the same time, often collects feedback from users around the country as a basis for improving the alloy. After 10 years of research and development, N70iM25nCo5 catalyst alloy has been widely used in domestic diamond manufacturers, and has become the best choice for synthetic diamond single crystal on six-sided top press. In 1984, the Ministry of Metallurgy organized technical appraisal and evaluated it as “the first in China. It has played a positive role in promoting the development of China's diamond industry and has actually become a stereotyped product”.

In terms of economic benefits, only one N70iM25nCo5 alloy produced in our hospital was 13.5 tons (output value of 1.475 million yuan) in 1984 and 505 tons (output value of 88.678 million yuan) in 1994. The output increased by 37 times in 10 years, and the output value increased 60 times.

In the 10 years after the identification of 1# catalyst, we have been paying attention to the development trend of the industry. In 1986 and 1993, we introduced 86-8# (including Cr, Si) and CHS3 (including Fe) catalyst alloys. Better promotion and application, and through the ministerial level of technical appraisal, but its impact is far less than the N70iM25nCo5 alloy catalyst.

I retired in December 1994 and I don't know much about other situations. (Author: CRIMM Liu Shuzhen)

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