Method for preparing titanate lamella

A technology of titanate and titanium compound, which is applied in the field of preparation of titanate lamellae, can solve problems such as brake noise cannot be effectively solved, affect the production process, and wear fast, and achieve good heat resistance and durability Improvement of wear performance, operating environment, and less wear

Active Publication Date: 2007-06-13
隗学礼
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the friction material containing potassium titanate whiskers has good sliding performance and braking effect, and has the advantages of less damage to the brake pad of the friction pair, the wear resistance of this material is not enough, especially in the high temperature area, the wear speed is faster , can not effectively solve the "brake noise"
Moreover, because it is in the form of fibers, the specific gravity is small, the volume is large, and the fluidity is poor. When manufacturing friction materials, it is easy to deposit on the wall of the feed port to block the passage, which affects the production process.
[0004] It is known that Japanese Patent Publication Hei 5-221795 has described a compound having the composition expression A x m y Ti 2-y o 4 (x=0.1-1.0, y=0.25-1.0) preparation method of orthorhombic layered structure lamella, Japanese Patent Publication 2000-230618 has described using it as a friction control agent for friction materials, and the prepared friction materials are in It has stable friction and wear resistance in low temperature to high temperature range; US Patent US6677041 describes the preparation method of flaky potassium titanate (including flaky potassium octatitanate, flaky potassium hexatitanate, and flaky potassium tetratitanate) , but the process is relatively complicated: first make a sheet of lithium potassium titanate or magnesium potassium titanate, then use acid to dissolve lithium and magnesium ions, then soak in potassium hydroxide solution, add potassium ions, control the pH value, and finally in Potassium titanate lamellar crystals of corresponding composition obtained by calcining at different temperatures, it can be seen that the cost is relatively high; patent CN01813460 more clearly describes K 0.2-0.7 Mg 0.4 Ti 1.6 o 3.7-4 Preparation method and friction material thereof
However, in the above-mentioned various production methods, a relatively large amount of flux (such as potassium chloride, potassium fluoride, potassium molybdate, potassium tungstate, etc.) must be added to the raw materials to make the lamellae grow, so the yield is low and the cost is low. higher

Method used

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  • Method for preparing titanate lamella
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Examples

Experimental program
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Effect test

Embodiment 1

[0025] Anatase Titanium Dioxide (TiO 2 Accounting for more than 98%) 160g, potassium carbonate (K 2 CO 3 Purity above 96%) 69g formula, adding magnesium fluoride (MgF 2 , analytically pure) 31.2g and metal Mg powder 2.6g, mix evenly, put into a box-type electric furnace and heat to 950°C, keep warm for 2 hours, and then cool with the furnace; put the burnt product in 10 times (weight ratio) of water Soaked and crushed; filtered to remove water, dried in an electric oven at 110°C for 5 hours, then placed in an electric furnace, and heat-treated at 650°C for 2 hours; 216g of the obtained white powder was analyzed by X-ray diffraction, and the chemical formula is K 0.8 Mg 0.4 Ti 1.6 o 4 Titanate (as shown in Figure 2 and Figure 3), the calculated yield is 95%. It is observed as lamellar crystals with a transmission microscope (as shown in Figure 1), and the average size is measured: the length and width are about 6 μm, and the average thickness is about 0.4 μm.

Embodiment 2

[0027] The raw material formula is the same as in Example 1, heated to 1000° C. in a box-type electric furnace, kept for 2 hours, and then cooled with the furnace; the rest of the operations are the same as in Example 1. Obtain white powder 218g, through X-ray diffraction analysis, it is that chemical formula is K 0.8 Mg 0.4 Ti 1.6 o 4 Titanate, the calculated yield is 96%. Observed as lamellar crystals with a transmission microscope, the average size measured: the length and width are about 8 μm, and the average thickness is about 0.5 μm.

Embodiment 3

[0029] The raw material formula is the same as in Example 1, heated to 1050°C in a box-type electric furnace, kept for 3 hours, and then cooled with the furnace; all the other operations are the same as in Example 1; 210g of white powder is obtained, and through X-ray diffraction analysis, the chemical formula is K 0.8 Mg 0.4 Ti 1.6 o 4 Titanate, the calculated yield is 93%. Observed as lamellar crystals with a transmission microscope, the measured average size: the length and width are about 12 μm, and the average thickness is about 0.6 μm.

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Abstract

The invention relates to titanate platelet manufacturing method. Its main features are as follows: using titanium and potassium bearing compound as raw material; mixing as 3.5-4.5 Mol rate of the TiO2 / K2O; adding certain magnesium bearing compound and composing at 900-1300 degree centigrade for 30min-10h; adding metal magnesium metal powder as accelerator to generate titanate platelet with average 1-20mum length width, 1-5 aspect ratio, and 0.4-2munm thickness which has high strength, high temperature resistant, good frictional properties etc, can be used as reinforcing agent for plastics composite, as friction control agent in car, train, airplane brake disks. The manufacturing technology of the invention has the advantages of simple, high yield, low cost, no environment pollution, and acceptable for commercial scale production.

Description

Technical field: [0001] The invention relates to the preparation technology of lamellar crystals, in particular to the preparation method of titanate lamellar crystals. technical background: [0002] In the past, the friction materials used as brake components were mostly asbestos dispersed in organic or inorganic binders. However, these materials do not have sufficient heat resistance and wear resistance. If the coefficient of friction is unstable and the wear resistance is poor, especially these properties will drop significantly in the high temperature area, which will lead to its greater attenuation. When the brakes are applied, the contact of the friction material with the high-speed brake pads causes a loud "brake noise". At the same time, asbestos is a known carcinogen, and its dust can cause operators to inhale and get sick. In view of such environmental sanitation problems, the use of asbestos has been increasingly restricted, and it is urgent to develop substitu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/32C30B29/62C30B1/02
Inventor 隗学礼赵宽放隗益民
Owner 隗学礼
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