Taiyuan Hongyu Machinery Equipment Co., Ltd. and other static presses to transform the use of special materials! 【Shanxi temperature isostatic press】
The special application of Shanxi temperature isostatic press, compared with the current market, the application of low-carbon new materials in China has been gradually promoted, whether it is from its toughness, hardness is equivalent to steel. It's all something that previous materials couldn't do.
We also know that the production of ceramics, generally to enhance the toughness of ceramics, usually introduces fibers or whiskers into the ceramic matrix, which requires a high temperature and a long time in the traditional sintering process. This leads to a degradation of surface strength and even a chemical reaction with the matrix using the introduced fibers and whiskers. Lost its role in strengthening resilience. So that the effect desired by the ceramic cannot be achieved.
But if we adopt this Shanxi hot isostatic press to sinter ceramics, it greatly reduces the sintering temperature and time. Fiber or whisker-reinforced ceramic matrix composites with excellent performance can be obtained. Moreover, after measurement, the use of hot isostatic press sintering process, in 1085~C1]P to obtain SiC whiskers with a relative density of up to 91.5% to strengthen SiC ceramics, so that we can also know that the special application of hot isostatic press technology makes our ceramics more efficient. is more beneficial to our sales.
Taiyuan Hongyi Machinery Equipment Co., Ltd. isostatic press is based on Pascal's principle, used for the molding of various powder products under ultra-high pressure, and the isotropy of the finished products is good, and the parts with high performance requirements, complex shapes and large slenderness ratios have good effects. The principle of isostatic pressure is Pascal's law: "The pressure of the medium (liquid or gas) in a closed container can be transmitted equally in all directions."
The working principle is that the powder is packed in an elastic mold and put into the ultra-high pressure working cylinder, and the hydraulic medium is injected into the ultra-high pressure working cylinder with a pump, which acts evenly on all surfaces of the mold to make the powder evenly compressed and formed.
The principle of isostatic pressing technology is based on Pascal's principle, using advanced technology to mold products under equal ultra-high pressure pressure in all directions. The isotropic identity of its finished products is good, and it has good effects for parts with high performance requirements, complex shapes and large slenderness ratios. Isostatic pressing technology has a history of more than 70 years, and was mainly used in powder metallurgy molding in the early stage; In the past 20 years, isostatic pressing technology has been widely used in ceramic casting, atomic energy, plastics, graphite, ceramics, permanent magnets, high-pressure electromagnetic porcelain bottles, biological drug preparation, food preservation, high-performance materials, military and other fields.
Isostatic pressing technology is divided into three different types: cold isostatic pressing, warm isostatic pressing and hot isostatic pressing according to the temperature during molding and consolidation. Cold Isostatic Pressing Technology (CIP) is at room temperature, usually rubber or plastic as the coating mold material, liquid as the pressure medium is mainly used for powder material molding, for further sintering, calcination or hot isostatic pressing process to provide. The general use pressure is 100~ 630MPa. Temperature isostatic pressing technology, the pressing temperature is generally 80~500°C. A special liquid or gas is used to transfer the pressure, and the pressure used is about 100MPa. It is mainly used for graphite, polyamide rubber materials, etc. that cannot be formed under room temperature conditions. This enables a solid green body to be obtained at elevated temperatures. Hot isostatic pressing (HIP) (HIP) is a process technology that subjects materials to isostatic pressing under the simultaneous action of high temperature and pressure, and it is not only used for the consolidation of powder bodies. The eyelash process is completed in two steps: molding and sintering. It is also used for diffusion bonding of workpieces, elimination of casting defects, and fabrication of complex shape parts. In hot isostatic pressing, inert gases such as argon and ammonia are generally used as pressure transfer medium, and the jacket material is usually metal or glass. The working temperature is generally 1000~2200°C, and the working pressure is often 100~200MPa. Isostatic pressing technology - characteristics compared to conventional molding technology
Isostatic pressing technology has the following characteristics:
a. The density of products for isostatic pressing molding is high, generally 5 ~ l5 higher than unidirectional and bidirectional molding. The relative density of hot isostatic pressing products can reach 99 8%~99.09%.
b. The density of the compacted is uniform and consistent. In touch molding, whether it is unidirectional or bidirectional pressing, there will be uneven distribution of compacted density. This change in density can often reach more than 10% when pressing complex shape products. This is caused by the frictional resistance between the powder and the steel mold. Isostatic fluid media transfer pressure, equal in all directions. The envelope and the powder are generally compressed, the powder and the jacket have no relative movement, the frictional resistance between them is very small, the pressure is only slightly reduced, this density is generally only less than 1%, therefore, it can be considered that the density of the green body is uniform.
c. Because the density is uniform. Therefore, the production of length-to-diameter ratio can be unlimited, which is conducive to the production of rod-shaped, tubular thin and long products.
d. Isostatic pressing molding process, generally do not need to add lubricant to the powder, which not only reduces the pollution of the product, but also simplifies the manufacturing process.
e. Isostatic pressing products with excellent performance, short production cycle and wide range of applications. The disadvantages of the isostatic pressing molding process are that the process efficiency is low and the equipment is expensive. This article focuses on some scenarios for the app.
