NAO friction material has still become the most popular disc brake pad material. With the increasing maturity of friction material industry, the raw material market has also changed with each passing day. The application of potassium titanate also provides a new path for the development of friction materials. In this study, a single factor comparative experiment was adopted. By adjusting the ratio between potassium titanate and barite powder, the increasing gradient of potassium titanate was 2% (mass fraction, and the percentage of raw materials involved in this paper was all mass fraction), and the decreasing gradient of barite was also 2%. Six groups of experiments were designed from 0% potassium titanate to 10% potassium titanate. Density, pH value, friction coefficient and volume wear rate were tested for each group of experiments. It is found that the content of potassium titanate has a regulating effect on the properties of friction materials, and when the content is 10%, the material has the best properties. The content of 2% potassium titanate did not improve the performance obviously.
As the potassium titanate whisker reinforced composite itself has excellent wear resistance and sliding properties, friction materials with good friction coefficient and wear resistance can be designed as long as they are combined with appropriate fibers and fillers [13]. Compared with wollastonite and calcium carbonate whisker, PTW was found to have more stable friction coefficient, lower wear rate and better thermal decay resistance [16]. 1.5. Research content and significance of this topic
Based on the basic experimental formula, the single factor and multi-level method was used to study and analyze the main effect of potassium titanate on NAO friction material and its influence on friction properties according to the hardness, density, friction coefficient, wear rate and PH value of different contents of potassium titanate friction plate. Potassium titanate used in this project is mixed potassium titanate produced by a company (specific parameters will be introduced below). This potassium titanate is simpler to manufacture and suitable for mass production. Therefore, the study of the role of potassium titanate in friction materials is more in line with the needs of production and manufacturing. It can also provide a new way for the production of friction materials. It can help to improve the friction and wear properties of friction materials and reduce the manufacturing cost.
Although whisker potassium titanate and phosphor flake potassium titanate have similar friction properties, the test results of domestic and foreign similar products are very similar. The morphology characteristics of potassium titanate used in this study are shown in Figure 1. SEM analysis shows that the potassium titanate used is mainly composed of large particles about 50 microns and flocculent fibers.
According to the XRD analysis in Figure 2, the main components of potassium titanate are potassium dititanate, potassium tetratititanate and potassium octitanate. Such mixtures of potassium titanate have more economic advantages than pure potassium titanate.
