Silicon carbide composite ceramic prepared by using photovoltaic silicon cutting wastes and manufacturing method thereof

Abstract

The invention discloses a silicon carbide composite ceramic prepared by using photovoltaic silicon cutting wastes. The silicon carbide composite ceramic is composed of the following components in percentage by weight: 40-100% of solid photovoltaic silicon cutting wastes, 0-60% of silicon carbide and 0-30% of carbon black. The invention further discloses a manufacturing method of the silicon carbide composite ceramic prepared by using the photovoltaic silicon cutting wastes; after the raw materials are uniformly mixed, pelletized and molded by pressing, the mixture is sintered at a high temperature by using a carbon black embeding method to obtain the silicon carbide composite ceramic. According to the invention, the wastes are recycled, and the pollution caused by the photovoltaic silicon cutting wastes to the environment is fundamentally eliminated; meanwhile, the production cost of the silicon carbide composite ceramic is obviously reduced and the competitiveness of products is extremely improved, so that an effective way to high value-added utilization of the photovoltaic silicon cutting wastes is provided.

Description

technical field

[0001] The invention relates to the technical field of ceramics, in particular to a silicon carbide composite ceramic and a manufacturing method thereof. Background technique

[0002] In recent years, with the increasing investment of the international community in the solar photovoltaic industry, the production of polysilicon for solar energy has entered a period of rapid development. Data show that in recent years, the global solar-grade polysilicon has developed rapidly at an annual growth rate of 40-50%. my country is one of the fastest growing countries in the solar photovoltaic industry and has become a major producer of polysilicon solar cells. According to statistics, 17 provinces and cities planned 35 large-scale polysilicon projects between 2007 and 2009. At present, the output of crystalline silicon wafers for solar cells has reached more than 100,000 tons.

[0003] In the production process of crystalline silicon wafers, silicon ingots are usuall...

Examples

Embodiment 1

[0029] 1. The silicon carbide composite ceramics in this embodiment are composed of raw materials by weight percentage:

[0030] Photovoltaic silicon cutting solid waste 80%, silicon carbide 20%.

[0031] 2. The manufacturing method of silicon carbide composite ceramics in this embodiment is as follows:

[0032] a) mixing the above-mentioned raw materials for batching;

[0033] B) batching and water are batched by weight: water=2: 1 is placed in the ball mill, and add the phenolic resin that is batching weight 0.8% to carry out mixing ball milling together;

[0034] c) granulating by spray drying process to obtain granulated powder, and then pressing and molding under a pressure of 50Mpa by dry pressing method to obtain a green body; drying the formed green body at a temperature of 75° C. for 2 hours;

[0035] d) Use 120-mesh carbon black to bury the body in the crucible, cover the crucible, keep it at 1420°C for 15 minutes, take it out after cooling in the furnace, and obta...

Embodiment 2

[0038] 1. The silicon carbide composite ceramics in this embodiment are composed of raw materials by weight percentage:

[0039] Photovoltaic silicon cutting solid waste 90%, silicon carbide 10%.

[0040] 2. The manufacturing method of silicon carbide composite ceramics in this embodiment is as follows:

[0041] a) mixing the above-mentioned raw materials for batching;

[0042] b) batching and water are batched by weight: water=3:1 is placed in the ball mill, and the epoxy resin that is 1.0% of batching weight is added to carry out mixing ball mill together;

[0043] c) granulating by spray drying process to obtain granulated powder, and then pressing and molding under a pressure of 20Mpa by dry pressing method to obtain a green body; drying the formed green body at a temperature of 75° C. for 2 hours;

[0044] d) Use 120-mesh carbon black to bury the green body in the crucible, cover the crucible, keep it at 1600°C for 15 minutes, take it out after cooling in the furnace, a...

Embodiment 3

[0047] 1. The silicon carbide composite ceramics in this embodiment are composed of raw materials by weight percentage:

[0048] Photovoltaic silicon cutting solid waste 85%, silicon carbide 15%.

[0049] 2. The manufacturing method of silicon carbide composite ceramics in this embodiment is as follows:

[0050] a) mixing the above-mentioned raw materials for batching;

[0051] b) batching and water are batched by weight: water=2: 1 is placed in the ball mill, and adding polyvinyl alcohol which is 2.0% of the batching weight carries out mixing ball mill together;

[0052] c) granulating by spray drying process to obtain granulated powder, and then pressing and molding under a pressure of 50Mpa by dry pressing method to obtain a green body; drying the formed green body at a temperature of 75°C for 1 hour;

[0053] d) Use 120-mesh carbon black to bury the green body in the crucible, cover the crucible, keep it at 1550°C for 15 minutes, take it out after cooling in the furnace,...

technical field

[0001] The invention relates to the technical field of ceramics, in particular to a silicon carbide composite ceramic and a manufacturing method thereof. Background technique

[0002] In recent years, with the increasing investment of the international community in the solar photovoltaic industry, the production of polysilicon for solar energy has entered a period of rapid development. Data show that in recent years, the global solar-grade polysilicon has developed rapidly at an annual growth rate of 40-50%. my country is one of the fastest growing countries in the solar photovoltaic industry and has become a major producer of polysilicon solar cells. According to statistics, 17 provinces and cities planned 35 large-scale polysilicon projects between 2007 and 2009. At present, the output of crystalline silicon wafers for solar cells has reached more than 100,000 tons.

[0003] In the production process of crystalline silicon wafers, silicon ingots are usuall...

Examples

Embodiment 1

[0029] 1. The silicon carbide composite ceramics in this embodiment are composed of raw materials by weight percentage:

[0030] Photovoltaic silicon cutting solid waste 80%, silicon carbide 20%.

[0031] 2. The manufacturing method of silicon carbide composite ceramics in this embodiment is as follows:

[0032] a) mixing the above-mentioned raw materials for batching;

[0033] B) batching and water are batched by weight: water=2: 1 is placed in the ball mill, and add the phenolic resin that is batching weight 0.8% to carry out mixing ball milling together;

[0034] c) granulating by spray drying process to obtain granulated powder, and then pressing and molding under a pressure of 50Mpa by dry pressing method to obtain a green body; drying the formed green body at a temperature of 75° C. for 2 hours;

[0035] d) Use 120-mesh carbon black to bury the body in the crucible, cover the crucible, keep it at 1420°C for 15 minutes, take it out after cooling in the furnace, and obta...

Embodiment 2

[0038] 1. The silicon carbide composite ceramics in this embodiment are composed of raw materials by weight percentage:

[0039] Photovoltaic silicon cutting solid waste 90%, silicon carbide 10%.

[0040] 2. The manufacturing method of silicon carbide composite ceramics in this embodiment is as follows:

[0041] a) mixing the above-mentioned raw materials for batching;

[0042] b) batching and water are batched by weight: water=3:1 is placed in the ball mill, and the epoxy resin that is 1.0% of batching weight is added to carry out mixing ball mill together;

[0043] c) granulating by spray drying process to obtain granulated powder, and then pressing and molding under a pressure of 20Mpa by dry pressing method to obtain a green body; drying the formed green body at a temperature of 75° C. for 2 hours;

[0044] d) Use 120-mesh carbon black to bury the green body in the crucible, cover the crucible, keep it at 1600°C for 15 minutes, take it out after cooling in the furnace, a...

Embodiment 3

[0047] 1. The silicon carbide composite ceramics in this embodiment are composed of raw materials by weight percentage:

[0048] Photovoltaic silicon cutting solid waste 85%, silicon carbide 15%.

[0049] 2. The manufacturing method of silicon carbide composite ceramics in this embodiment is as follows:

[0050] a) mixing the above-mentioned raw materials for batching;

[0051] b) batching and water are batched by weight: water=2: 1 is placed in the ball mill, and adding polyvinyl alcohol which is 2.0% of the batching weight carries out mixing ball mill together;

[0052] c) granulating by spray drying process to obtain granulated powder, and then pressing and molding under a pressure of 50Mpa by dry pressing method to obtain a green body; drying the formed green body at a temperature of 75°C for 1 hour;

[0053] d) Use 120-mesh carbon black to bury the green body in the crucible, cover the crucible, keep it at 1550°C for 15 minutes, take it out after cooling in the furnace,...